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Transmitter Circuits

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

Last Updated: November 30, 2017 02:27 PM

Circuits Designed by Dave Johnson, P.E. :
Transmitter for Line Powered Xenon Flash -  This line powered xenon flash circuit drives a small camera type flash tube.  it has an optical isolator to allow the flash to be safely triggered from some remote device.  A flash rate of 2Hz is possible with the circuit . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

TV-VCR Light Source 40Khz Repeater -  This circuit is designed to be placed directly in front of a standard TV or VCR remote.  The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

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.-June, 2000

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747




Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Variable Power Supply for the FM Transmitters -  This is a fairly simple, yet very versatile workbench power supply.  With a current limit of 1.5 amperes and a variable voltage from 2.7 volts to 16.5 volts on the output of the LM317T, this unit will come in very handy for your diversified electronic projects (which usually include different DC voltages.  I have used it mainly for supplying my FM transmitters with different voltages, to see the different effects it has on the units.  in fact, I use it for all my FM transmitters.  it has served me well.  and is still serving proudly!  __ Designed by braincambre500 @ yahoo.com

Veronica 1W FM Transmitter -  Veronica 1W FM transmitter is an easy to build transmitter.  Veronica is also known for frequency stability, clean FM signal and uses no integrated circuit.  The Veronica oscillator is actually formed from 2 oscillators which operates somewhere around 50 MHz in antI phase and the 2 signals are combined to form 100MHz FM radio signal.  This kind of circuit design is stable and is amplified up to 1W by 2n4427 transistor.__ 

Veronica 1W PLL FM Transmitter -  The VERONIC A 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 approximatively 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 bandwith (fully RDS compatible) * No complex tuning needed.  * High quality PCB * Full documentation & construction details available__ 

VERONICA 1W-5W 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__ 

VERONICA FM Transmitter -  Very stable and great sounding transmitter.  __ 

Very Simple Circuit ADSB Receiver using a TV tunder to alLow reception of aircraft transponders -  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 __ Designed by Edward John Cardew

Very stable RF bug -  At first, the thought of producing a bug that would transmit 400 metres sounded far-fetched.  if you consider a circle of radius 400 metres, the area enclosed is quite considerable.  To send a signal over this range is quite an achievement and when we first started designing minI transmitters we had no idea of what we would achieve.  Some of the first devices went 50 metres, then 100, and then 200 metres. __ Designed by Collin Mitchell

Very stable transmitter than can be carried & Move while in use, range is 100-200 meters -  This is our first FM transmitter in a series.  We will be specialising in showing how to design very efficient FM transmitters using a good layout and correctly-designed "tank circuits."

The Wasp is a 100 to 200 metre (100 to 200yds) device having a very stable performance.  it can be used as a hand held microphone or left on a shelf to pick up the sounds in a room.   it has many interesting features.  These will be fully described in the article.  One of the most important features of this project is the use of standard components.  This gives it universal appeal as the parts can be obtained from almost any electronics store.   __ Designed by Collin Mitchell

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 CW TX -  I use this simple CW transmitter for working through the RS13 satellite.  Using just 10 Watts and a dipole at 3M above ground, I have made many contacts around Europe and across the Atlantic __ Designed by EI9GQ homebrew radio

VHF FM Transmitter -  The circuit is a simple 88-108 MHz VHF FM transmitter circuit.  it is basically a VHF Colpitts oscillator capable of transmitting sound or music to any standard FM receiver.  The circuit is powered by 9V battery which makes it easily portable.  it also has a capacitor microphone which picks up very weak sound signals.  The output frequency can be easily adjusted by potentiometer thanks to onboard MV2109 varicap diode and the frequency stability is quite good.  The range of this transmitter is 100 meters.__ 

VHF FM Transmitter MAX2606 -  if you want to be independent of the local radio stations for testing VHF receivers, you need a frequency-modulated oscillator that covers the range of 89.5 to 108 MHz but building such an oscillator using discrete components is not that easy.  Maxim now has available a series of five integrated oscillator building blocks in the MAX260x series which cover the frequency range between 45 and 650 MHz.  The only other thing you need is a suitable external coil, dimensioned for the midrange frequency.__ 

VHF transmitter -  Schematic only __ Designed by Peter Jakab

VHF Video Transmitter 60-200 MHz -  Here's a simple video transmitter for VHF TV channel will accept baseband video input, hence it can be driven by most CCD cameras and VCR video outputs.  it ouputs roughly 80mW and when used with a 40cm telescopic antenna over 100 meters range is possible.__ 

VHF Wireless Data Transmitter -  This project is only an example of what can be done.  The legalities of building and operating radio transmitters are different in different parts of the world.  Be sure to check your local laws before building or operating a transmitter like the one shown here. __ Designed by Dick Cappels

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.  __ 

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__ 

Video emitter uses battery power -  08/30/01 EDN Design ideas:  The block diagram in Figure 1 shows how to make a cable-free, direct-video system.  The system allows users to walk from booth to booth at an exhibition to interview people and to display the interviews in real time on three screens at key locations.  You can use the small and simple system each time you need to capture image and sound on the run __ Circuit Design by JM Terrade, Clermont-Ferrand, France

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.  __ 

VLF Upconverter for Shortwave Receiver -  The schematic above is a simple up converter which I used in conjunction with a short-wave receiver to quite successfully to monitor solar flare activity a few years ago.  You can use a 3.5 or 4 MHz crystal for Y1 to up convert from about 10 KHz to 150 KHz to either 3.510 or 4.010 MHz respectively.  A long wire antenna was used here but a VLF loop antenna __ Designed by Radio-Sky Publishing

Voyager 2 FM Radio Bug -  VOYAGER is a super-sensitive FM Radio microphone developed by Talking  Electronics.  The components are all common types of resistors, capacitors and transistors matched so well in this circuit that  amazing  sensitivity and  distance  are obtained.  The name VOYAGER was given to it "because it  goes so far".  We have re-designed the Board and further matched some components  to  suit  the  needs  of  the  classroom.  The result is a superb bug which is compact but powerful, and quite easy to build__ CdS Electronic

VXO- based freq synthesizer -  VXO based PLL Frequency Synthesizer for 7 MHz __ Contact Vasily Ivanenko

VXO FM Bug -  After constructing my Solar Powered FM Bug circuit, I decided to try building an FM bug with a more frequency-stable oscillator.  Numerous Variable Crystal Oscillator (VXO) circuits have been published for ham radio receivers and transmitters, these are normally used for fixed frequency CW applications.  I decided to see if it would be possible to use a varactor diode (voltage variable capacitor) to modulate the frequency of a crystal oscillator with an audio signal __ Designed by G. Forrest Cook

WBFM TX V7 -  The circuit is identical to the V7 VHF FM Transmitter but with a few small additions.  TR1 (BC547) is an inverted Hartley oscillator which based upon an inductor fabricated on the PCB.  This makes it megga-stable, and setable.   __ Designed by Harry Lythall-SM0VPO

Wide Band RF Amplifier for 10MHz-500MHz Input -  This paper describes an RF amplifier circuit which is suitable for the frequencies between 10MHz and 500MHz.  These kind of amplifiers are called wide band amplifiers.   __ Designed by Yilmaz Kalafat, PE1PYJ

Wilkinson Power-Combiner On 630m -  it's often easier to achieve high power on 630m or LF by combining lower powered amplifiers than it is to build a single high-power rig. A simple Class D push-pull switching FET amplifier can readily produce 400-500W when operated in the 35V range __ Designed by VE7SL - Steve

Wireless Alarm Transmitter & 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 __ Designed by Published in Elecktor July/Aug, 2010

Wireless AM Microphone -  Schematic only __ Designed by va3iul

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.   __ Contact Collin Mitchell

Wireless FM Transmitter -  The photo shows a wireless FM transmitter, pocket radio and yellow disk for size comparisons.  Speak into the transmitter and others hear you on any FM radio.  The transmitter can be built in an afternoon with simple, affordable and widely available parts.  Construction is fun and much can be learned although performance is modest; for example, your voice gets difficult to hear at distances greater than 25 feet.   __ Designed by Boondog web site

Wireless guitar transmitter -  Schematic only__ 

Wireless IR Headphone RX-TX CD4 046 -  Schematic only __ Designed by va3iul

Wireless Microphone -  Circuit & notes only, no circuit description given.   __ Designed by Tony van Roon  VA3AVR

Wireless Microphone FM Transmitter -  This Wireless Microphone FM Transmitter has been a very popular project with beginners and experienced constructors alike.  it has been used inside guitars and as the basis of a remote control system.  I do however, receive many requests for a higher powered circuit and better microphone sensitivity.  Now I can introduce the new FM Wireless Microphone, which also has a better frequency stability, over 1Km range (under ideal conditions) and is good on microphone sensitivity.  This has been achieved by adding an RF amplifier buffer (with 10dB gain) and an AF preamplifier to boost the modulation a little.__ 

wireless microphone transmitter -  Schematic only __ Designed by Peter Jakab

Wireless microphone using 741 opamp & 2N3904 -  Schematic only__ 

Wireless Phono Oscillator -  A "phono oscillator" is a simple, short-range AM band transmitter that was typically used to send the signal from a phonograph to a nearby radio, eliminating the need for an amplifier and speaker.  This version uses only one transistor and __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

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 Remote Controller Transmitter -  Schematic Only __ Designed by Jon Fick

Wireless RF PWM Dual Motor Controller -  This is a very simple Wireless RF transmitter circuit that consists of the Holtek HT-12E encoder chip and AM 418MHZ-transmitter module (WZ-X01, other similar device can be used).  Using the hybrid RF xmit/receive modules make building the RF remote control a lot easy __ Contact info @ wzmicro.com

Wireless transmitter for PIR using Holtek HT12E -  Schematic only, no circuit description__ 

Wonderful One-Transistor Radio -  This reflex radio project was inspired by Robert Bazian 's design.  His reflex radio is the "darndest" thing I have seen and his spectacular results inspired me to come up with my own version.  These designs are  similar to two-transistor circuits used in some ancient Japanese "Boys Radios" except that the inter-stage transformer directly drives the speaker.   __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

WLW 500KW Transmitter Schematic -  The transmitter was designed with redundancy and cutback (reduced power mode) in mind, giving the transmitter more continuity of service.  The final amplifier was divided into 3 separate modules, each using four RCA type UV-898 tubes in push-pull parallel making up a total of 12 output tubes.  The outputs of the three modules were combined in series in such a way,  __ Designed by Jim Hawkins

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.-June, 2000

Xtal parameters with spectrum analyzer & tracking generator -  Crystal Parameters --- Experiments with a Tracking Generator + Spectrum Analyzer __ Contact Vasily Ivanenko

Xtal Radio Plans -  The radio in diagram 1 uses a variable inductor (coil) for tuning. The radio in diagram 2 uses a variable capacitor for tuning. Both radios are otherwise the same. The coil consists of 110 turns of 28 gauge enameled magnet wire wound on a 1.5" form. (toilet paper tube is easiest to get, but you can use something like plastic or other non-conductive material- hollow is best. D1 is a common 1N34 germanium diode- this is the detector. The crystal earplug is not the same thing as one would commonly find at your electronics parts store __ Designed by Keith Addison

XTAL switcher using diodes -  Ham Radio - Other __ Designed by Guy Roels ON6MU

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)  __ Designed by Harry Lythall-SM0VPO

Yaesu FT-897, FT-857 & 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)  __ Designed by Bjarke Korsgaard

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


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