Electronics DIY - Quality Electronic Kits, Electronic Projects, Electronic Schematics, FM Transmitte

Web Name: Electronics DIY - Quality Electronic Kits, Electronic Projects, Electronic Schematics, FM Transmitte

WebSite: http://electronics-diy.com

ID:175900

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1Hz - 2MHz XR2206 Function Generator 1Hz - 2MHz XR2206 Function Generator produces high quality sine, square and triangle waveforms of high-stability and accuracy. The output waveforms can be both amplitude and frequency modulated. Output of 1Hz - 2MHz XR2206 Function Generator can be connected directly to 60MHz Counter for setting precise frequency output. 60MHz Frequency Meter / Counter Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc. ESR Meter / Transistor Tester / LC Meter ESR Meter / Transistor Tester / LC Meter kit is an amazing auto-ranging multimeter that automatically identifies and analyzes components being tested. It measures ESR values, capacitance (100pF - 20,000uF), inductance (10uH - 20H), resistance (0.1 Ohm - 20 MOhm), tests many different types of transistors such as NPN, PNP, FETs, MOSFETs, Thyristors, SCRs, Triacs and many types of diodes. It also analyzes transistor's characteristics such as voltage and gain. It is an irreplaceable tool for troubleshooting and repairing electronic circuits. Accurate LC Meter Build your own LC Meter and start making your own coils and inductors. Accurate LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. Accurate LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF.  Voltmeter Ammeter Voltmeter Ammeter can measure voltage with 100mV and current up to 10A with 10mA resolution. It is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored. USB IO Board USB IO Board is a tiny spectacular little input / output development board featuring PIC18F2455 / PIC18F2550 microcontroller. When attached to a computer IO board will show up as RS232 COM port. You can control 16 individual microcontroller I/O pins by sending simple serial commands. USB IO Board is self-powered by USB port and can provide up to 500mA power for your projects. USB IO Board is breadboard compatible. Stereo FM Transmitter High quality BA1404 Stereo FM Transmitter with crystal clear stereo sound, excellent frequency stability and good transmission range. Audiophile Headphone Amplifier Audiophile headphone amplifier includes high quality audio grade components such as Burr Brown OPA2132/OPA2134 opamp, ALPS volume control potentiometer, TI TLE2426 rail splitter, Ultra-Low ESR 470uF Panasonic FM capacitors, WIMA input and decoupling capacitors and Vishay Dale resistors. 8-DIP machined IC socket allows to swap opamp with many other chips such as OPA2227, OPA2228, dual OPA132, OPA627, etc. It's small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from single 9V battery. USB Voltmeter USB Voltmeter is a PC based dual channel voltmeter built around PIC18F2550 microcontroller that measures voltage from 0.00V up to 500.00V with 10mV resolution. USB Voltmeter sends measured data to PC via standard USB connection displaying data on a computer monitor. USB Voltmeter is self-powered drawing very little current from USB port. Voltage readings are displayed via included USB Voltmeter software. USB IO Board Stick USB IO Board Stick is a tiny spectacular input / output development board / parallel port replacement that can be used to control many different devices via USB port. It may also be used for data acquisition such as collecting data from sensors, buttons, voltage/current measurements, etc. It plugs right into computer's USB port so no USB cable is required. FM Transmitter Tiny FM Transmitter transmits audio through on-board microphone for up to 300 meters. Transmitter has high sensitivity microphone and good frequency stability. May be used as a bug, for room monitoring, baby listening, nature research, etc. Frequency is adjusted through variable coil. Comes with 9V battery clip. Micro SD MP3 Player Complete MP3 player that plays MP3 audio files stored on microSD memory card. New audio DAC chip supports microSD cards up to 128GB (FAT32 format), and provides excellent sound quality and base.500mW FM / VHF Transmitter Amplifier / Booster High performance low noise 500mW RF amplifier / booster kit for boosting output power all low power FM transmitters such as BA1404, BH1417, BH1415, 433MHz transmitter modules, etc. The amplifier chip is an integrated circuit containing multiple transistor stages and all other parts conveniently within a single small package. Boosting your FM transmitter has never been easier and the output signal can also directly drive 2n4427 or 2n3866 transistors for 1W or 5W of RF output power. 60MHz Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. It is a very useful bench test equipment for testing and finding unknown frequency of oscillators, radio receivers, transmitters, function generators, crystals, etc. It has excellent input sensitivity thanks to onboard amplifier. Build your own Special Edition Accurate LC Meter and start making custom made precision coils and inductors. Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors. It can measure inductance starting from only 10nH - 1000nH, 1uH - 1000uH, 1mH up to 100mH and capacitance from 0.1pF up to 900nF. Accurate LC Meter is designed for professionals that require unprecedented measurement accuracy and includes high preci-sion components that are only found in premium quality kits. Control appliances wirelessly with 4-Channel RF Remote Control. Works through the walls with 200m / 650ft range. You can control lights, fans, garage door, robots, security systems, motor-driven curtains, window blinds, door locks, sprinklers or anything else you can think of. Voltmeter Amperemeter can measure voltage up to 70V with 100mV resolution and current up to 10A with 10mA resolution. It is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored. The meter uses PIC16F876A microcontroller with built-in ADC (Analog to Digital Converter) and 16x2 green backlighted LCD display. Circuit design uses very few components and may be mounted on a small PCB. The meter can also be modified and calibrated through three buttons to measure voltage higher than 70V and current greater than 10A. Stereo FM Transmitter with BA1404 IC Posted on Monday, April 12, 2021 There are many applications for an FM transmitter, particularly if it can broadcast in stereo. You can broadcast stereo signals from your CD player or any other source to an FM tuner or radio. This FM Transmitter uses a single BA1404 IC and a few other components. It broadcasts on the 88-108MHz FM band so that it can be received by any standard FM tuner or portable radio. Transmitter runs from a 5V supply and can drive a dipole antenna for improved range. High Performance Stereo Audio Amplifier using LM3886 Posted on Monday, February 22, 2021 The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4? load and 38W into 8? with 0.1% THD+N from 20Hz–20kHz. The performance of the LM3886, utilizing its Self Peak Instantaneous Temperature SPiKe protection circuitry, puts it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Operating Area. SPiKe protection means that these parts are completely safeguarded at the output against over voltage, under voltage, overloads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks. The LM3886 maintains an excellent signal-to-noise ratio of greater than 92dB. It exhibits extremely low THD+N values of 0.03% at the rated output into the rated load over the audio spectrum, and provides excellent linearity with an IMD typical rating of 0.004%. 1Km FM Transmitter with UA741 Opamp Posted on Wednesday, February 10, 2021 This project is the construction of FM transmitter circuit for commercial radio frequencies between 88 MHz and 108 MHz. The transmitter is easy to build and offers good frequency stability through the usage of UA741 oamp. 1Km range can be achieved when powered by 9V battery with 30cm long telescopic antenna. Easy Crystal Locked FM Transmitter Posted on Tuesday, November 24, 2020 The circuit presented here uses a crystal oscillator and frequency multiplier to generate a highly-stable carrier signal frequency of 96MHz. It can be used to transmit voice or music up to hundred meters. The circuit is built around 9018 transistor, 24MHz crystal, air coil and a few other basic components. Adjustable Delay Circuit Posted on Wednesday, November 18, 2020 Build an adjustable auto power On Off delay timer circuit using CD4541 timer. This electronic timer circuit is helpful when you need to power On/Off any AC Appliances after a pre-defined duration. Delay time it can be adjusted from about 2 to 120 seconds. DIY Adjustable Bench Power Supply Posted on Monday, October 05, 2020 Every electronics hobbyist needs at least one bench power supply in his house for tinkering with some weekend projects. This small power supply was built with an old 19V 3A laptop charger and buck-boost converter. Output voltage is continuously adjustable from 1.25V to 33V with up to 3A current. I have been using it for 3 weeks now and have realized that I am using it more than I thought I would. BA1404 FM Stereo Transmitter with Amplifier Posted on Tuesday, June 02, 2020 This is a classic low-cost stereo FM transmitter that can send your signal to a FM receiver within 500 meter range. This transmitter uses the famous BA1404 all-in-one chip and operates from 5v power supply. Stereo channel separation is excellent. You can even use this as a front-end stereo RF signal generator for a large FM transmitter setup; by adding step-by-step RF amplifier. A few inch long copper wire can be soldered at the PCB to use as an antenna. The gang-condenser can be used to adjust frequency output. You can use this with your iPod or other audio source, inside your home or car on in an outdoor garden party or wherever you use. LM350 3A Adjustable Voltage Regulator Posted on Monday, May 04, 2020 The LM350 is a tried and true 3A adjustable voltage regulator. It accepts an input voltage up to 35V and can deliver an output voltage between 1.25 and 33V. It is rugged beyond belief. Where fairly beefy step-down converters go up in smoke, the LM350 just takes a nap. And a nap is infinitely better than a plume of smoke. LM350 can also be used to limit current though that requires a separate LM350/LM317 in series with our voltage regulator. 1 Watt FM Amplifier Posted on Tuesday, April 14, 2020 This is 1 Watt FM amplifier with a good design that can be used to amplify RF signal of low power FM Transmitters in the 88 – 108 MHz band. It is very sensitive if you use good RF power amplifier transistors, trimmers and coils. It has a power amplification factor of 9 to 12 dB (9 to 15 times). At an input power of 0.1W the output will be 1W. You must choose T1 depending on applied voltage. If you have a 12V power supply then use transistors like: 2N4427, KT920A, KT934A, KT904, BLX65, 2SC1970, BLY87. At 18 to 24V power supply you must use transistors like: 2N3866, 2N3553, KT922A, BLY91, BLX92A. You may use 2N2219 at 12V but you will get maximum output power of 0.4W. TDA2050 Stereo Audio Power Amplifier Posted on Monday, March 23, 2020 This is 2x30W audio amplifier based on TDA2050 and LM1875. Amplifier PCB is suitable for both TDA2050 and LM1875 chips. Amplifier has all the necessary circuitry on board – power supply, speaker protection, delayed turn-on and fast turn-off. This is achieved using the convenient uPC1237 IC. TDA2050 and LM1875 are pin to pin compatible, the differences in their schematics are the values of a couple resistors and one capacitor. All this allows to make an universal circuit board, suitable for any of these two ICs. Presented here is a premium quality 1Hz - 2MHz XR2206 Function Generator kit capable of producing high quality sine, square and triangle waveforms of high-stability and accuracy. The output waveforms can be both amplitude and frequency modulated. Coarse frequency adjustment is accomplished using 4-DIP switch for the following four frequency ranges; (1) 1Hz-100Hz, (2) 100Hz-20KHz, (3) 20KHz-1MHz, (4) 150KHz-2MHz. Frequency output can be fine tuned using P1 and P2 potentiometers. The kit includes output that can be connected to 60MHz Counter kit to measure output frequency. 1Hz - 2MHz XR2206 Function Generator kit includes premium quality components, including Audio Grade Capacitors, Gold Plated RCA Connector, WIMA Capacitors, 1% Metal Film Resistors and premium quality PCB with red solder mask and plated through holes. Build your own Special Edition Accurate LC Meter (Inductance Meter / Capacitance Meter) and start making custom made precision coils and inductors. Accurate LC Meter allows to measure incredibly small inductance making it perfect tool for making all types of RF coils and inductors. It can measure inductance starting from only 10nH - 1000nH, 1uH - 1000uH, 1mH up to 100mH and capacitance from 0.1pF up to 900nF.Special Edition LC Meter includes top notch high precision components that are only found in premium quality kits. It includes high quality double-sided printed circuit board (PCB) with red solder mask and pre-soldered tracks for easier soldering, detachable LCD display with yellow-green LED backlight, programmed PIC16F628A microcontroller chip, high precision capacitors and inductor, 1% Metal Film resistors, Machined IC Sockets, gold plated header pins, LCD header connectors and all the other components that are needed to build a premium quality kit. Thanks to the use of LCD connectors LCD display can be detached from the main PCB board at any time even after the kit has been assembled. All components are through-hole and are easy to solder. Special Edition Accurate LC Meter is designed for professionals that require unprecedented measurement accuracy and offers great value at low cost. This is 60 MHz Frequency Meter / Counter for measuring frequency from 10 Hz to 60 MHz with 10 Hz resolution. It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc. The meter provides very stable readings and has excellent input sensitivity thanks to onboard amplifier and TTL converter, so it can even measure weak signals from crystal oscillators. With the addition of prescaller it is possible to measure the frequency of 1GHz and above. The meter measuring range has been recently upgraded and it can now measure from 10Hz to 60MHz instead of 10Hz to 50MHz. PIC Voltmeter Amperemeter can measure voltage 0-70V with 100mV resolution and current consumption 0-10A with 10mA resolution. The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored. The meter uses PIC16F876A microcontroller with built-in ADC (Analog to Digital Converter) and 16 x 1 green backlighted LCD display. With slight modification it is possible to measure higher voltage and current. Be "On Air" with your own radio station! BA1404 HI-FI Stereo FM Transmitter - Special Edition Kit is an exciting transmitter that will broadcast high quality stereo signal in 88MHz - 108MHz FM band. It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground. Add 500mW FM / VHF Transmitter Amplifier / Booster for even longer range. Special Edition BA1404 HI-FI Stereo FM Transmitter Kit includes premium components with audio grade gold capacitors, 1% Metal Film Resistors and quality PCB with Red Solder Mask and Plated-Through Holes. The kit is based on the popular BA1404 stereo broadcaster IC which contains all the complex circuitry for generating the stereo FM signal. 38 KHz crystal provides a rock solid stability of sub-carrier for stereo signal. USB IO Board is a tiny spectacular little development board / parallel port replacement featuring PIC18F2455/PIC18F2550 microcontroller. USB IO Board is compatible with Windows / Mac OSX / Linux computers. When attached to Windows IO board will show up as RS232 COM port. You can control 16 individual microcontroller I/O pins by sending simple serial commands. USB Input / Output Board is self-powered by USB port and can provide up to 500mA for electronic projects. USB IO Board is breadboard compatible. Simply solder included 12-PIN & 8-PIN male headers on the bottom side of the PCB and the board can be plugged into a breadboard for quick prototyping. These are examples of what can be built using USB IO Board: USB Relay Controller (turn ON/OFF lights or appliances in the house). Control LEDs, toys, electronic gadgets, wireless control, etc. USB LCD Controller USB Volt / Ampere / Wattage Meter. USB CNC Controller USB Data Logger USB Temperature Meter / Logger USB Thermostat USB Humidity Meter / Logger USB Digital RF Power Meter USB Stepper Motor Controller USB RC Servo Controller and much more 5W PLL Stereo FM Transmitter features PLL synthesized drift free operation with high quality BH1415 chip. 5W RF output power is achieved with 2SC1971 6W transistor in the output stage. Front panel digital control comes with LED display and case is made high quality aluminum. The board features EMI filtering on audio and power inputs and comes with Microphone and Audio inputs. Once transmitter is turned on it starts broadcasting with previously selected frequency. Overall this 5W PLL Stereo FM Transmitter provides professional broadcast audio quality and rivals commercial broadcasts. This is a high performance low noise 500mW amplifier / booster for all low power FM transmitters such as BA1404, BH1417, BH1415, 433MHz transmitter modules, etc. The amplifier chip is an integrated circuit containing multiple transistor stages and all other parts conveniently within a single small package. Boosting your FM transmitter has never been easier and the output signal can also directly drive 2n4427 or 2n3886 transistors for 1W or 5W of RF output power.SPECIFICATIONS- Output Power: 500mW- Input Frequency: 50MHz - 1300MHz- Voltage Supply: 9-12V This Phone FM transmitter connects in series to your telephone line and transmits the telephone conversation over the FM band when you pick up the telephone handset. Transmitted signal can be tuned by any FM receiver. The circuit includes an "On Air" LED indicator and also provides a switch which can be used to turn off the transmitter. A unique feature of the circuit is that no battery is needed to operate the circuit since power is taken from the telephone line. Build your own LC Meter and start making custom made coils and inductors. This LC Meter allows to measure incredibly small inductance making it perfect tool for making all types of RF coils and inductors. LC Meter can measure inductance starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitance from 0.1pF up to 900nF. The circuit includes an auto ranging and reset switch to make sure the readings are as accurate as possible.This is a Special Edition LC Meter with upgraded top notch components. It includes upgraded high precision capacitors, inductor, 1% Metal Film resistors and Gold Plated Machined IC Sockets, header pins and LCD header connectors. This edition is designed for professionals that require unprecedented measurement accuracy. This is a new project USB Relay Controller that allows to control from eight to fifteen external devices through computer's USB port. You may control different appliances in your house such as lights, fans, garden sprinklers, computers, printers, TV sets, radios, music systems, air conditioners, fish tanks, or anything else you can think off, all conveniently through your computer. The software features iPhone based interface and it is fun to work with. Stay tuned for more details ... Be "On Air" with your own radio station! BA1404 based transmitter is an exciting product that will broadcast high quality stereo signal in 88MHz - 108MHz FM band. It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.The circuit is based on the popular BA1404 stereo broadcaster IC which contains all the complex circuitry for generating the stereo FM signal. 38 KHz crystal provides a stable sub-carrier for the stereo signal. The oscillator circuit is stable enough for reliable reception even on digitally tuned FM radios. PCB includes green solder mask layer for easier soldering and protects wires that do not need soldering. Build your own LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and "Zero Out" function to make sure the readings are as accurate as possible ... This is extremely simple to build PIC Temperature meter that allows to measure temperature in two different locations at the same time. Meter can display both Celsius and Fahrenheit values (together or individually) and is capable of measuring temperatures from -55 to 125 degrees Celsius (-67 to 257 degrees Fahrenheit). Never before such a useful and powerful circuit could be built with so little components and yet provide endless possibilities. This is all possible thanks to the use of PIC16F628 microcontroller and 2x16 character LCD display that act like a small computer which can be customizable thanks to upgradeable hex firmware.Presented PIC temperature meter uses two very exciting DS18S20 1-Wire digital temperature sensors. Unlike regular sensors where temperature readings are passed as varying voltage, DS18S20 passes temperature information in a digital format as data. This brings many new possibilities and enables to pass temperature information over much longer distances just over a two wire cable. Having the ability to control various appliances inside or outside of your house wirelessly is a huge convenience, and can make your life much easier and fun. RF remote control provides long range of up to 200m and can find many uses for controlling different devices around the house.4 button RF remote is used to turn ON / OFF 4 different devices independently. 10A Relay outputs can switch appliances that use 110V / 220V mains voltage. This is very simple yet unique RF Amplifier Remote Volume Control based on PIC16F628 microcontroller that offers features that other remote volume controls do not.1) Long Range Wireless 433MHz RF Radio Remote Control allows to control amplifier even through the walls 2) Allows to control audio volume with high quality Motorized ALPS Stereo Potentiometer3) Allows to turn ON / OFF Audio Amplifier4) Automatically turns ON speakers 2 seconds after the power has been turned ON to eliminate the power-on noise5) Automatically turns Speakers OFF 1/2 second before power is disconnected to eliminate the power-off noise6) Allows to switch input between two audio sourcesMore information will be available soon ... This is our upcoming project that is similar to PIC Dual Temperature Meter but with the thermostat option built-in. Besides displaying customized temperature readings in Celsius and/or Fahrenheit degrees it will turn on heater if the temperature drops below specified temperature or it can be set to turn on the fan or air conditioning system if the temperature reaches above specified temperature that is set by UP / DOWN buttons. Thermostat can display both Celsius and Fahrenheit values (together or individually) and is capable of measuring temperatures from -55 to 125 degrees Celsius (-67 to 257 degrees Fahrenheit)Presented PIC temperature meter with thermostat uses very exciting DS1820 1-Wire digital temperature sensor. Unlike regular sensors where temperature readings are passed as varying voltage, DS1820 passes temperature information in a digital format as data. This brings many new possibilities and enables to pass temperature information over much longer distances just over a two wire cable.Stay tuned for full details on this project. This is a new project that uses four button RF remote control to turn ON / OFF four different devices independently. Any of the four outputs can be configured to work independently in either momentary or ON / OFF mode. Outputs are buffered by BC549 transistors and can drive devices directly or be connected to 5V / 12V Relays to turn ON / OFF appliances that use higher 110V / 220V voltage. Remote control provides long range of up to 200m / 650ft and can find many uses for controlling different indoor and outdoor devices. We will be providing all components for building this project. Stay tuned for more information. 24-Bit 192KHz PCM1793 DAC is perfect solution for upgrading audio components such as CD Player, DVD Player, Blue Ray Player, Computer, and Satellite receiver. It can be easily connected via Coaxial S/PDIF or Optical Cable and provides convenient analog output connectors. PCM1793 Audio DAC board features advanced Burr-Brown PCM1793 DAC chip, high quality OPA2134 op-amp, and latest DIR9001 digital line receiver. PCB board is built with high quality components such as Nichicon Audio capacitors, WIMA capacitors, gold plated connectors, gold plated PCB tracks and metal film resistors. PCM1793 DAC provides detailed heights and exceptionally good sound stage. As the stunningly original name suggests, the A4 contains 4 separate power amplifiers. This unit offers great flexibility - the following modes of operation are available: * Four-channel 50 watts per channel operation for surround-sound or multi-room operation. * Two-channel bi-amped mode, for suitably bi-wireable loudspeakers. * Two channel Bridged mode, offering around 150 watts per channel. Very stable FM transmitter based on TSA5511 synthesizer. Frequency is performed with three buttons through PIC16F84 microcontroller. Frequency is displayed on 16x1 LCD. This is a simple chassis using just 4 aluminum panels and 2 heatsinks. Designed around dimensions to tightly pack in a LM3886 chip amp kit. The top and bottom panels sit in ridges cut into the heatsinks with a table saw, and then the front and back panels just bolt into the end fins. Rear panel fixings are held with M3 nut and bolts, and panels that join to the heatsinks are held by M4 bolts tapped directly into the heatsinks so no additional brackets are required. Heatsinks are 75 x 160 x 50mm with a 10mm thick base. This is a high fidelity 100W MOSFET Amplifier. The benefits of using MOSFETs in the output stage is that they have a high input impedance at low frequencies, and are capable of extremely high slew-rates. This very attribute makes them rather prone to HF oscillation when improperly compensated, but with careful design they're capable of delivering an impressive performance. This is a sneak preview of upcoming PIC voltmeter project. You may use this PIC voltmeter for your power supply, as a battery meter for car, RC cars, RC helicopters, to monitor voltages in your computer or it could be used as a small portable voltmeter.PIC voltmeter can measure 0-70 Volts which should be more than enough for most of electronic projects providing excellent reading accuracy and resolution. It has two input channels for measuring two voltage sources at the same time. This PIC voltmeter project uses PIC16F876 microcontroller with built-in ADC (Analog to Digital Converter) and 2x16 backlighted LCD display. Circuit design uses very few components and may be mounted on a small PCB. Stay tuned for more info. This simple AVR Programmer will allow you to painlessly transfer hex program to most ATMEL AVR microcontrollers without sacrificing your budget and time. It is more reliable than most other simple AVR programmers available out there and can be built in very short amount of time.Entire AVR programmer has been build with using very simple parts and easily fits in the case of the serial connector. The socket pcb has been created to to fit a 28-DIP AVR Atmega8 microcontroller, but you can easily build a socket pcb for any other AVR microcontroller. This AVR programmer is compatible with a popular PonyProg that even shows you a status bar of the programming progress. This is a high quality PLL Stereo FM Transmitter with build-in VHF amplifier with impressive transmission range. It is based on BH1417 chip that offers high quality crystal clear stereo transmission. Eight available frequencies are controlled by grounding 3 pins on header connector. This transmitter comes assembled and is ready to use. This MP3 player module is based on the latest innovative BU9432 chip from RHOM. It features USB 1.1 / 2.0 Controller, MP3 decoder, system controller for loading MP3 files form a USB flash drive, USB hard drive, USB CD-ROM or USB DVD-ROM drive all in one chip. Once USB flash drive is connected, BU9432 automatically searches for MP3 files for playback. Audio is controlled by tactile buttons; Play, Stop, Previous Song and Next Song. BU9432 can decode VBR MP3, MP2, MP1, Layer 1, 2, 3 files with Sampling rate: 8K - 48KHz and Bit rate: 8Kbps - 448Kbps. It can also recognize FAT16 and FAT32 USB flash drive / hard drive with capacity from 32MB to 2TBytes. Audio playback is exceptionally good with 93dB signal to noise ratio and 88dB dynamic range. This high quality stereo FM transmitter prototype is a result of many hours of testing and tweaking. The goal was simple; to test many existing BA1404 transmitter designs, compare their performance, identify weaknesses and come up with a new BA1404 transmitter design that improves sound quality, has very good frequency stability, maximizes transmitter's range, and is fairly simple for everyone to build. We are happy to announce that this goal and expectations have been met and even exceeded.The transmitter can work from a single 1.5V cell battery and provide excellent crystal clear stereo sound. It can also be supplied from two 1.5V battery cells to provide the maximum range. We have just received a new batch of hard to find SAA1057 ICs. SAA1057 is a popular integrated circuit that is used as PLL Frequency Synthesizer in AM / FM transmitters. The SILMIC II series are Elna's highest grade audio aluminum electrolytic capacitors that exhibit superior acoustic characteristics. An entirely new type of electrolytic separating paper is used, containing silk fibers. The extreme softness of silk can mitigate vibrational energy (generated by the electrodes, by external vibrations and by electromagnetic fields). Due to it's new electrolytic and foil design the signal propagation speed has increased (the ESR is reduced) and a more powerful, yet-mellow, sound is possible than before. When these capacitors were subjected to aural evaluations, the high range peak and midrange roughness were reduced substantially. Also, the low range richness and power were increased in the obtained high-quality sound. This is the latest BH1415 Stereo Encoder design from RHOM that includes a lot of great features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference and crystal based stereo encoder for stereo transmission. This is the latest BH1417 Stereo Encoder design from RHOM that includes a lot of great features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference and crystal based stereo encoder for stereo transmission. This simple one chip FM receiver / TV tuner will allow you to receive frequencies from 70 up to 120MHz. With this small receiver it is possible to pick up TV stations, entire 88 - 108MHz FM band, aircraft conversation and many other private transmissions. It is a perfect companion to any FM Transmitter especially if FM band in your area is very crowded. TDA7000 receiver offers very good sensitivity therefore it will even allow you to pickup weaker signals that cannot be heard on conventional FM receivers.A neat feature of presented TDA7000 FM receiver is a voltage controlled oscillator similar to TV tuners that are used in television sets ... This multimeter was designed to measure output voltage 0-30V and current with 10mA resolution in a Power Supply, where the current sense shunt resistor is connected in series with load at the negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. An additional function of the multimeter is that it can control (switch on and off) an electric fan used to cool the main heatsink. The power threshold at which the fan switches on can be adjusted using One Touch Button Setup. This is a high fidelity external USB Soundcard / USB Headphones project that can be built for your PC or Mac. It is based on the latest PCM2706 IC which functions as a high quality, crystal clear 16-BIT Stereo DAC. It is a single chip digital-to-analog converter that offers two D/A output stereo channels, digital S/PDIF output and requires very few external components. PCM2706 includes integrated USB 1.0 & USB 2.0 compliant interface controller and it is conveniently powered directly from USB connection. PCM2706 is a USB plug-and-play device and does not require any driver installation under Windows XP and Mac OSX. This is the latest BH1417 FM Transmitter design from RHOM that includes a lot of features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, stereo encoder for stereo transmission, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference, PLL circuit that provides rock solid frequency transmission which means no more frequency drift, FM oscillator and RF output buffer. This is our upcoming project where you will learn how to use your computer's parallel port to send text messages to two line 16 character LCD display. Once you will build PC to LCD interface which only requires a parallel port connector, cable and an LCD, you can set your imagination free and build a lot of interesting projects like car MP3 player, display date and time, weather information, and much more. This is a very easy and fun to build project that will allow you to control up to eight external devices through your computer's parallel port. You may for instance control different appliances such as lamps, computers, printers, tv sets, radios, music systems, air conditioners, air fans, garden sprinklers and anything else you can think of, all through your computer. In the future versions you will be able to program at what time a particular device should be turned on or off. If you should have any suggestions for any additional features please let us know. This digital voltmeter is ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5 Digit LED display with a negative voltage indicator. It measures DC voltages from 0.1 to 199.9V with a resolution of 0.1V. The voltmeter is based on single ICL7107 chip and may be fitted on a small 3cm x 7cm printed circuit board. The circuit should be supplied with a 5V voltage supply and consumes only around 25mA. Ammeter is a great addition to any Laboratory Power Supply as it will allow you measure the current consumption and help determine if there are any problems with the circuit that you are building or testing. This amper meter is capable of measuring the current consumption from 1mA up to 10A with selected 1mA, 10mA and 100mA resolutions, and consumes only about 25mA of current. The ammeter is based on single ICL7107 chip and 3.5 Digit seven segment LED display. Due to a relatively small number of components that the circuit is using it is possible to fit it on a small 3cm x 7cm printed circuit board. Here is the latest and greatly improved TX200 VFO/VCO FM transmitter. The most versatile transmitter to date that can be turned into high fidelity stereo PLL based 200mW FM transmitter. It is a perfect circuit for transmitting your music around the house and yard. TX200 uses only two coils; one in the oscillator and the other one in the 200mW VHF amplifier so it should be fairly easy for anyone to build. New replacements for hard to find varicap diodes. These variable capacitance diodes change its capacitance as voltage is applied to them. They are perfect for tuning the frequency of PLL based FM transmitters, VCO FM Transmitters, FM / VHF receivers, TV tuners, etc. MV2105 - 2-16pF varicap diode replacement for BB105 and BB205 varicap diodes.MV2109 - 2-36pF varicap diode replacement for BB109, BB209 and BB405 varicap diodes.MV104 - 2-42pF DUAL varicap diode replacement for KV1310, BB104, BB204 and BB304 varicap diodes. Please refer to TX200 FM transmitter page to see examples on how you can implement varicap diodes in your own projects http://electronics-diy.com/tx200.php Finding a "good" LC Meter (inductance / capacitance meter) that would accurately measure all inductor types and coils is not an easy task. We have been searching for this type of LC meter for a long time now. We have been considering many commercial LC meter versions, but most of them were either too pricey or limited in measurement ranges. Finally, after studying different PIC16F84 based LC meter designs, a lot of testing and tweaking, we have came up with a unique design. The LC Meter is very compact and fairly simple to build. It's based on the PIC16F84A, LM311 ICs, and LCD module. The heart of the meter is a PIC16F84A IC that performs LC calculations, and LM311 IC that functions as a frequency generator. The LC Meter can measure surprisingly small inductances; starting from 10nH, whole uH range and mH up to 100mH. It also measures capacitances starting from 0.1pF up to 900nF. We will soon carry the following tunable RF coils that are perfect for precise frequency tuning of your transmitter. The magnet wire is halfway embedded within the plastic, providing excellent frequency stability. One of these coils have been tested in the TX200 transmitter as a substitution for an air coil and a variable capacitor. As a result the frequency stability was greatly improved. The coils are 7mm x 10mm and each comes with its own metal can, which may be removed. Tunable RF coils come in the following inductance ranges:2.5 turns 48 - 59nH (Red) 3.5 turns 65 - 79nH (Orange) 4.5 turns 90 - 109nH (Yellow)5.5 turns 109 - 132nH (Green) As of today we are starting the sale of the popular BA1404 IC which has integrated stereo encoder and FM transmitter, all in one package. We also carry 38KHz crystals so if you have been waiting to build your own stereo FM transmitter to transmit your music around the house, grab a schematic from the "Schematics" section and start building one today. For a fraction of price of the PLL transmitter kit you can build this small PLL module that will allow you to upgrade your existing FM transmitter to be; fully digitally tuned and to have rock solid frequency stability. The circuit is based on SAA1057 Philips frequency synthesizer, PIC16F84A microcontroller from PICMicro and 4MHz crystal.The PLL module works amazingly well and connection to the FM transmitter is very easy. In fact it requires only four components; two varicap diodes, 100K resistor and 1-10pF capacitor. I will post a tutorial on how to connect this PLL module to the TX200 transmitter once I find some more time. Here is another small tutorial on how you can test and use varicap diodes in the voltage controlled or PLL based FM oscillators. Build an inexpressive 0.1 - 199.9V LCD digital voltmeter that can be easily configured as amper and temperature meter. This module is based on a popular ICL7106 IC that can measure its own voltage supply and offers very low power consumption. This is the most attractive USB PIC Programmer that has great features in a compact design. It comes with a 40-pin ZIF (zero insertion force) socket, upgradeable firmware on PIC16F628 chip, ICSP (In Circuit Serial Programming), easy to use GUI software, and can program wide range of PICMicro microcontrollers. Build an easy stepper motor driver that will allow you to precisely control a unipolar stepper motor through your computer's parallel port. The project comes with a program that has easy to use graphical interface, allows you to control the motor speed, direction in real-time and it also allows you to use and learn about different stepping methods, such as single stepping, high torque stepping and half stepping modes. Stepper motor controller also displays an animation that helps you visualize the current as it flows through individual coils. It is a wonderful tool to learn how stepper motors work. This stereo encoder is the perfect for those looking for a high quality stereo sound transmission at a low cost. This stereo encoder produces an excellent crystal clear stereo sound and very good channel separation that can match with many more expensive stereo encoders available on the market. This is all possible thanks to NJM2035 chip and 38KHz quartz crystal that controls the 19kHz pilot tone. You will never have to calibrate or re-adjust the circuit's frequency. This is a very easy and fun to build project that will allow you to control up to eight external devices through your computer's parallel port. You may for instance control different appliances such as lamps, computers, printers, tv sets, radios, music systems, air conditioners, air fans, garden sprinklers and anything else you can think of, all through your computer. The prescaler kit is a simple divide by 10 ECL circuit which can be used to extend the range of most PIC based frequency counters from 50 MHz up to 500 MHz. The kit uses surface mount components except for the 78L05 regulator. Calculates and displays L and C from oscillation frequency using reference components.This instrument requires two precision components: A precision capacitor and a precision inductor. You only need to start with one precision component, either the reference capacitor or the reference inductor, and using this meter, you can select or adjust the other precision component.In my case, I used a pretty high accuracy BK Precision inductance/capacitance meter and sorted through piles of inductors and capacitors to find those that had the ... This is 7-digit frequency meter measuring frequency from 10 Hz up to 1300 MHz. It is based on ideas of PIC16F84 based frequency meter.The measuring range is divided into two subranges: 10Hz - 25MHz and 25 MHz - 1300MHz. The decimal point is after MHz digit, but can be set at any position.It contains: * PIC 16F84 * 74HC137 (BCD -> 1 of 8 decoder) * SAB6456 VHF-UHF divider by 256 ... 400W Stereo Audio Amplifier based on the original Marshall Leach involvement, but has made some improvements. Regarding the power supply voltage to the +-75V. VC comparing the performance of the modified Leach 700W/2R on one common board of both channels, as well as protection and control circuits for the fans. Compared to the 700W version a bit different in wiring. Because some things in the 700W version is completely tightened to perfection. This is an easy to make power supply which has stable, clean and regulator 0-28V 6/8 Amp output voltage. By using two 2N3055 transistors we become more then 2 times the amount of amps then the power supply delivers, making it real though to brake ;). Although you could use this design to deliver 20 amps (with almost no modifications and with a proper transformer and a huge heat sink with a fan), I did not needed such much power. ... Randall converted an Arduino into AVR chip programming hardware for use with AVRDude. The project programs AVR tiny13 and other tiny AVR chips using an Arduino. He provides code and instructions to implement the Atmel AVR910 In System Programming protocol. I ported the Atmel AVR910 In System Programmer protocol to the Arduino. Now I can write programs to my ATtiny2313 and tiny13 chips. The Arduino sketch is available for download here. It works with the AVRDude programming software. This article ... This small phone transmitter will transmit a phone conversation to an FM radio on the 88-108MHz band. It uses energy from the phone line to transmit the signal about 100 meters away. It uses the phone wire as the antenna and is activated when the phone is picked up. Transmitter components are mounted on a small PC board. PC layout is included. If you want a Power Lamp Flasher at normal electric power, try out Table Lamp Circuit like this is. It uses the integrated circuit NE555 as the core component. It controls the blink rate of the lamp. Use the power transistor for about 20W or current 1.6A. The Q3 can be replaced by TIP41 or H1061 or MJ3055 or 2N3055. Have you ever wanted to broadcast your own radio station within your neighborhood? This small and simple 87-108MHz FM transmitter is the toy that geeks have always wanted. This tutorial includes the PCB layout and the schematics. It has a range of up to 1/4 mile or more. It's great for room monitoring, baby listening and nature research. This is a 8 channel RF remote control project. The transmitter powered by 5V.the RF module I used had long start-up and power down period after receiving a high pulse. To counter all of this I kept the receiver in constant standby mode, but sending a information all the time. That way the noise is flooded out, and the receiver will always respond. I had been trying all sorts of error detection methods and different ways of encoding the bytes, ... credits will be yours and we will list your name, e-mail address and your website URL if you have one. Submit Project Let us know how we can better serve you or what electronic projects or kits you would you like to see at Electronics-DIY.

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