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Transmitter Circuits

Transmitters:  #'s       A - C       D - L       M - P       Q - S      
T - Z
 

Last Updated: June 02, 2021 05:07 AM


Circuits Designed by Dave Johnson, P.E. :
  • Xenon Flash Transmitter-Air Transparency Monitor -  This is the matching transmitter for the above receiver. The transmitter launches powerful 1000-watt light pulses that last about 20 microseconds . . . [Hobby Circuit designed by David Johnson P.E.,  06/17/00]

UHF-TV Preamplifier -  . . . 

Ultrasonic transmitter -  This is a fairly commonly published self-oscillating driver for ceramic (piezo) resonators. However with some resonators it can be a bit temperamental: the 1n0 capacitor across the top transistor of the totem-pole helps it to start up. Some resonators won't need this. . . .  [Page's Author: Richard Torrens]

ultrasonic-transmitter-and-receiver -  Presented here are the circuits of ultrasonic transmitter and receiver that use two CD4017 decade counters and ultrasonic transducers. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved]

Unusual Frequency Dividers -  This paper is a collection of unusual frequency divider techniques which offer features not achieved with ordinary divider ICs or prescalers. . .  [Charles Wenzel (unless otherwise noted)]

USB 0-500MHz RF Power Meter based on a AD8307 -  Measurement of transmitter output RF power has never been easier and more precise. AD8307 USB 0-500MHz RF Power Meter allows to measure the power of transmitters from 1nW to 2W / 50W with 40dB attenuator. Output is displayed in dBm, Watts (nW, uW, mW and W range) as well as input voltage. USB RF Power Meter is based on popular AD8307 watt meter IC and PIC18F2550 microcontroller. . . .  [Designer not identified]

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USB FM Transmitter MAX2606 -  This MP3 Player FM transmitter can be used to listen to your own music throughout your home. The transmitter circuit use no coils that have to be wound. When this FM transmitter used in the car, there is no need for a separate input to the car stereo to play back the music files from your MP3 player. . . . 

USB RDS Coder Board using ATmega32 -  This board is a RDS coder using an ATMEL AVR ATmega32. This board can be controled by a RS232 link, USB interface or SPI. TA data is displayed wiyth a LED and can be controled by : - Hardware input - RS232 - USB - SPI (not yet implemented) . . . 

Veronica 1W PLL FM Transmitter -  The VERONICA transmitter is a very stable, powerful, and high quality FM emitter. Thanks to a PLL, the output frequency is controlled with DIP switches. Output power is approximately 1W with a single regulated 13.8v supply ! (see specifications) Features : * High RF output power : 1W * Full 87. 5-108MHz range (100KHz increment). * Very stable output frequency : Crystal reference & Phase Locked Loop. * Professional input bandwidth (fully RDS compatible ) * No complex tuning needed. * High quality PCB * Full documentation & construction details available. . . 

VERONICA FM Transmitter -  The Veronica is an easy to build and tune transmitter for the FM band. It's known for it's stability and clean signal, does not use any IC's or similar specialized parts, and it has a built-in tuning aid that makes it possible to tune it with no extra equipment. It's available in two versions, 1 and 5 watts. . . . 

Very Simple ADSB Receiver -  With this design you can expect to get several 100 km range with a good antenna. I use a home made J-pole with a single 32 Eurocent BFP420 transistor giving excellent low noise gain for very little money. It can be bought like most of the needed components at Reichelt. Many good quality (Kathrein for example) Satellite L band line amplifiers use this transistor and if you can get at least 12 Volts to the preamp they offer excellent performance despite being laid out for 75 Ohms. I'll document the preamp later. This is what you can get in Luxembourg with a clear view to the South for several kilometers. . .  [Edward John Cardew]

Very stable RF bug -  . . .  [Collin Mitchell's web site]

Very stable transmitter than can be carried & move while in use, range is 100-200 meters -  . . .  [Collin Mitchell's web site]

VHF Audio Video Transmitter -  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. . . 

VHF beacon transmitter -  Schematic only, no circuit description. . .  [Designer's name not given]

VHF transmitter -  . . .  [Peter Jakab, Electrical Engineer, Engineer of Informatics]

VHF/UHF Prescaler -  The recommended Prescaler is ridiculously simple. It consists of just one IC, a TV tuner prescaler, the Philips SAB6456A, which can divide by 64 or by 256. This chip is widely available both new and in the surplus market at much lower prices than conventional divide by 10 prescalers. . . . 

VHF/UHF TV Modulator -  Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set's aerial input via a cable. Then all that remains to do is tune the TV to the correct frequency. . . . 

Video/Audio Wireless Transmitter -  Television signals operates as two separate transmissions. One for the video and the other for sound. And just like our project, two different devices are going to be built. . . . 

Wireless Alarm Transmitter and Receiver -  Here are two circuits that make it possible to add up to eight detectors to an existing alarm system without running a single cable. Each transmitter has a unique number that is reported to the central unit in the event of an alarm, and the transmitter battery condition is monitored. must register on this site. . .  [Published in Elecktor July/Aug, 2010]

Wireless Doorbell -  The transmitter circuit is made up of two building blocks, the 303MHz RF oscillator and the 32kHz crystal controlled oscillator. The 303MHz oscillator consists of a self-oscillating circuit made up of the coil. . . .  [email Colin Mitchell: talking AT tpg.com.au]

Wireless IR H'phone Transmitter -  Schematic only, no circuit description included. . .  [designer's name not included]

Wireless microphone using 741 opamp and 2N3904 -  . . . 

Wireless PLL Stereo FM TX with LCD -  Now you can use your MP3 Player to listen your favorite tunes through any FM stereo receiver. Wireless FM transmitter wirelessly connects portable music players to your car or home stereo quickly and easily. Just plug the FM Transmitter into the headphone jack of your MP3 or any audio source including iPOD, PDA, CD Player, Cassette player or connect it to your PC or laptop computer. Tune your card stereo or receiver to the clearest FM frequency, and enjoy your digital music with full sound and convenience. . . . 

Wireless transmitter for PIR using Holtek HT12E -  Schematic only, no circuit description. . .  [Designer's name not given]

WLW 500KW Transmitter Schematic -  . . . 

Xenon Flash Transmitter-Air Transparency Monitor -  This is the matching transmitter for the above receiver. The transmitter launches powerful 1000-watt light pulses that last about 20 microseconds . . . [Hobby Circuit designed by David Johnson P.E.,  06/17/00]

XTAL-Controlled FM TX (V6) -  My FM Wireless microphone V5 has been very popular, both as a beginners project and as a kit. It is interesting that it has also been the biggest cause of lots of e-mail, the most common question being How can I make it crystal controlled?. The oscillator can be made crystal controlled; replace the 2p7 with a 5th harmonic crystal. The oscillator will then be very stable, so stable in fact, that it cannot even be modulated!This means that you could only use it to send CW (morse code) . . .  [from Harry Lythall's website]

Yaesu FT-897, FT-857 and FT-817 transceiver-PC interface (YFPI) -  This interface is used to fully control a transceiver, from a personal computer, when operating digital amateur radio modes (made in January 2006). . .  [Bjarke Korsgaard's website]


Transmitters:  #'s       A - C       D - L       M - P       Q - S       T - Z


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