1.5 Volt Tracking Transmitter #2:  (electronic circuit added 7/03)

1.5 Volt Tracking Transmitter:  (electronic schematic / circuit added 4/02)

1.5V tracking transmitter:  (electronic circuit added 05/07)

10W HF Linear Amplifier:  (electronic circuit added 7/03)

14MHz SSB 10mW Transceiver:  (electronic circuit added 05/07)

150mW FM Transmitter:  (electronic circuit added 7/03)

1-transistor FM Transmitter:  A truly minimalist circuit. Performance is relatively poor and stability is a problem. Q1 modulates  signal and acts as an oscillator. L1 and C5 determine  frequency. Decrease C5 for a higher frequency and vice-versa. You won't get a long range transmission with this one.  author claims 50-500 feet. A lot depends on  antenna. It must be made of stiff wire or else  frequency will change as you move  antenna. Experiment with different lengths to get  maximum range. 50cm or less should work reliably most of  time. A longer antenna might give even better range but if you exaggerate,  circuit will begin to oscillate and performance will drop dramatically. A regular telescope whip should work, too.  (added 10/05)

2 Transistor FM Transmitters:  (circuit / schematic design added 6/06)

2 Transistor LED Flasher #1:  (circuit / schematic design added 6/06)

2 Valve 40m CW Transmitter:  (electronic design / schematic added 2/05)

2 Valve CW Transmitter:  (electronic circuit added 7/03)

250mW HF CW Transmitter:  (electronic circuit added 7/03)

27MHz AM/CW Transmitter:  (electronic circuit added 7/03)

27MHz toy car receiver:  (circuit / schematic design added 6/06)

2N2222 40 Meter CW/DSB Transceiver:  (electronic schematic / circuit added 4/02)

2-transistor FM Transmitter:  While re are a plethora of similar 2-transistor schematics available, this one is above average. A major improvement over  little 1-transistor circuit that we've discussed previously, this transmitter consist of two stages.  first transistor is used to amplify audio, which means that  microphone is now much more sensitive to sound.  second one acts as an oscillator.  All in all, this is an interesting project for beginners and more experienced hobbyists alike. Use any stiff wire or telescope whip antenna, just make sure that it's not too long. Range should be about 100m or even more in  open. Stability is still a problem, though.  (added 10/05)

30 Meter QRP Transmitter for Morse Code:  (electronic schematic / circuit added 4/02)

3W HF QRP Linear Amplifier:  (electronic circuit added 7/03)

4 Transistor Transmitter:  (schematic added 8/03)

4-20 mA Digital-to-Process Current Transmitter:  AN-21 Analog Devices Application Notes  (app note added 6/06) Describes a 3 I.C. Digital to 4-20 mA Current Output Circuit (DAC08, REF01 and OP221)

433MHz Transmitter using SAW Resonator:  (electronic circuit added 7/03)

4-transistor transmitter:  (electronic circuit added 05/07)

4W FM Transmitter :  Don't be fooled by  relative simplicity of this transmitter. With 4W of power, it's not a toy! Since it operates in  FM band (88-108MHz), a license is required for broadcasting. With a good and properly mounted antenna this baby has a range of up to 50km. In mountainous terrain or in built-up areas, this figure is smaller, of course.  circuit is fairly small.….  (added 11/05)

5 watt 80 meter QRP CW Transceiver: 

5 Watt FM Transmitter with Antenna (88-108 MHz):  (electronic schematic / circuit added 11/05)

5 Watt HF CW Transmitter:  (electronic circuit added 7/03)

500mW HF Linear Amplifier:  (electronic circuit added 7/03)

5W PLL Transmitter:  (electronic circuit added 05/07)

7MHz QRP Transmitter:  (electronic circuit added 7/03)

7MHz SSB Transceiver:  Circuit diagram and brief description of 7MHz SSB Transceiver for Hams. The circuit is designed around two numbers of MC1496. It can push around 80 Watts with IRF840 in  final. You can down load HTML version or  printer friendly word document. (added 9/04)

80 Meter DSB Transmitter:  (circuit / schematic design added 6/06)

800 meter (2400ft) range FM transmitter that fits on top of standard 9V battery:  (circuit added 05/07)

807 and 1625 Valves:  data on vacuum tubes 807) and 1625 used in ham radio transmitters. Describes various pin voltages and different operation modes. . (added 9/04)

A 2.x GHz WiMAX Direct Conversion Transmitter:  AN-826 Analog Devices Application Notes  (app note added 6/06)

A 3m (100 MHz) small bug:  (circuit added 05/07)

A Basic RF Transmitter for PIR Sensors:  (circuit / schematic added 6/05)

AM DSB Transmitter for Hams:  circuit diagram of simple double side band suppressed carrier (DSBSC) transmitter for hams. Circuit uses crystal oscillator, crystal can be switched for multi band operation. . (added 9/04)

AM Transmitter (circuitdb):  circuit is deliberately limited in power output but will provide amplitude modulation (AM) of voice over the medium wave band. The circuit is in two halfs, an audio amplifier and an RF oscillator. (added 05/07)

AM Transmitter (zen22142):  (circuit / schematic design added 6/06)

AN-21: 4-20 mA Digital-to-Process Current Transmitter:  AN-21 Analog Devices Application Notes  (app note added 6/06) Describes a 3 I.C. Digital to 4-20 mA Current Output Circuit (DAC08, REF01 and OP221)

AN232: Low Frequency Magnetic Transmitter Design:  Microchip Application Note Published 14-Oct-02   (app note added 2/06)

AN242: Designing an FCC Approved ASK RFPIC™ Transmitter:  Microchip Application Note Published 2-Jan-03   (app note added 6/06)

AN-543 - Monaural FM Transmitter (DSP, 20,641 bytes):  AN-543-MonauralFMTransmitter-Analog Device Application Notes  (app note added 6/06) 

AN-543 - Stereo FM Transmitter (DSP, 26,085 bytes):  AN-543-StereoFMTransmitter-Analog Device Application Notes  (app note added 10/06) 

AN-654: Optical Module Development Platform 2.5 GBPS Transmitter with Digital Diagnostics:  AN-654 Analog Devices Application Notes  (app note added 6/06)

AN-673: 2-Way Multiplexed LCD Drive and Low Cost A/D-Converter using V/F Techniques with COP8 Microcontrollers:  National Semiconductor Application Note   (app note added 6/06)

AN-826: A 2.x GHz WiMAX Direct Conversion Transmitter:  AN-826 Analog Devices Application Notes  (app note added 6/06)

Antennas for HAM Transmitters:  Describes how to construct various type of antenna for Ham Radio Transmitters. (added 9/04).

ATV Repeater Controllers:  (electronic schematic / circuit added 4/02)

Automatic Repeater:  This circuit will be of interest to  radio amateur and anyone possessing two radios, (one of which must be able to transmit i.e. a transceiver). It is a self powered (audio derived) repeater circuit for receiving a signal and re-transmitting it via  or radio.  (added 10/05)

Basic RF Oscillator #1:  (electronic schematic / circuit added 4/02)

Basic RF Transmitter for PIR Sensors:  (electronic diagram added 6/03)