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Transmitter Circuits
Transmitters:  #'s       A-C       D-G       H-Q       R-T      

Last Updated on:
Sunday, August 23, 2015 06:02 AM

0.1-3.5GHz Prescaler -  This handy prescaler divides input frequency by 1000. It takes maximum input frequency of 3.5GHz and converts it into 3.5MHz that may be measured using standard frequency meter. . . .  [Designer's name not included]

0-500MHZ LM3914 RF Power Meter -  RF Measurement has been an expensive work so far the cost f measuring instruments are concerned. Although, the other project, PM2, is hot favorite among radio amateurs for RF Measurement, I wanted something smaller. . .  [Dinesh Gajjar, VU2F0-Circuit Designer]

0-500MHz PIC16F876 RF Power Meter -  RF Measurement has been an expensive work so far the cost of measuring instruments are concerned. RF Meter is based on PIC16F876 microcontroller, AD8307 and 2x20 LCD display. Full documentation is included. . . .  [Dinesh Gajjar, VU2F0-Circuit Designer]

1 Valve 3.5MH CW Transmitter -  amateur radio construction projects. . . .  [from Peter Parker's website]

1 Valve CW Transmitter -  This one-valve (ECL82) CW Transmitter occupies a very special place in my amateur radio history. I was first licensed in 1994 but did not operate on air. I committed to only ever operate equipment which I had made myself. I had no time for radio construction and several years passed. In early 2002. . .  [Written by Hans Summers]

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

1 Watt AM transmitter for the 10 meter band (28MHz) -  In this project, you will make a simple 3-stage low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator with amplifier. You can connect the circuit to the an electred microphone or amplified dynamic microphone. Using an electred microphone is shown (in gray) in the diagram below. (no amplified dynamic microphone has a to low output voltage to work. at least 100mv is needed). You could also add a LF preamp stage of one transistor to allow connecting a dynamic microphone directly. You'll see that you can receive the signal through the air with almost any AM radio receiver. Although the circuits used in radio stations for AM receiving are far more complicated, this nevertheless gives a basic idea of the concept behind a principle transmitter. Plus it is a lot of fun when you actually have it working!  Remember that transmitting on the 10 meter band you'll need a valid radioamateur license!!. . .  [by Guy Roels ON6MU]

1 Watt Class-C Amplifier -  schematic only, no circuit description. . .  [Charles Wenzel (unless otherwise noted)]

1 Watt Four Stage FM Transmitter -  This FM transmitter circuit uses four radio frequency stages: a VHF oscillator built around transistor BF494 (T1) , a preamplifier built around transistor BF200 (T2) , a driver built around transistor 2N2219 (T3) and a power amplifier built around transistor 2N3866 (T4). A condenser microphone is connected at the input of the oscillator. . . .  [Designer unknown]

1 Watt Morse Transmitter -  Schematic only, no circuit description included. . .  [CircuitoZ.net, contact Ruddy]

1 Watt RF Amplifier -  This is a universal 1 Watt RF class C amplifier that is ideally suited for low power FM transmitters. Input should be at least 100mW to achieve 1W output. It is recommended to enclose the amplifier in a metal case. . . .  [Designer's name not included]

1.3W VHF RF Amplifier 2SC1970 88-108 MHz -  This RF power amplifier is based on the transistor 2SC1970 and 2N4427. The output power is about 1. 3W and the input driving power is 30-50mW. It will still get your RF signal quit far and I advice you to use a good 50 ohm resistor as dummy load. To tune this amplifier you can either use a power meter/wattmeter, SWR unit or you can do using a RF field meter. . . .  [Designer's name not included]

1.5 volt FM transmitter -  Schematic only, no circuit description included. . .  [designer not identified]

1.5 volt tracking transmitter -  Schematic only, circuit description not included. . .  [Andy Wilson's site]

1.5V Battery operated FM reBroadcast transmitter  -  This implementation is adapted to rebroadcast the output of a CD player, television receiver, or radio receiver. I use it so that I can move about the house and listen to my favorite programs without disturbing others. Within and the house. . .  [Contents 2002, 2003 Richard Cappels All Rights Reserved]

1.5V Tracking Transmitter (with Video Clip) -  The current draw for this tracker is 3.7mA, so the 1. 5V button cell will last awhile. What the heck am I suppose to hear you ask? When your circuit is working you should see the LED flash quite fast. Take your FM radio and search for the low-beat 'humbe-humbe-humbe-etc' equal to the flash of the LED (Tony van Roon's probably around the 100Mhz). Found it? If that position is interferering with a radio station. . .  [Tony van Roon's circuit]

1.5W VHF Amplifier -  Circuit Schematic only. . .  [Designer's name not included]

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Transmitter Circuits
Transmitters:  #'s       A-C       D-G       H-Q       R-T      

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