One Valve 3.5MH CW Transmitter:  (electronic design / schematic added 2/05)

Op Amp Based FM Transmitter:  (electronic circuit added 7/03)

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

Pen bugging device ideal for corporate espionage:  (diagram added 05/07)

Phasing SSB Exciter:  (electronic circuit added 7/03)

PIC16C505 IR/Wireless Remote Control:  (schematic added 8/03)

PLL FM Transmitter:  (circuit / schematic design added 6/06)

Powerful AM Transmitter:  (electronic circuit added 10/05)

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

QRP Keyer:  very simple keyer circuit using only one transistor. . (added 9/04)

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

Quality FM Transmitter:  (electronic Circuit / Schematic added 10/04)

Radio Remote Control using DTMF:  (electronic circuit added 10/05)

Remote control using VHF modules:  (electronic circuit added 10/05)

RF telemetry transmitter features minimal parts count:  1/6/05   EDN-Design Ideas / (added 5/05)

RF Transmitter Light Sensing:  (electronic schematic / circuit added 4/02)

RF Transmitter uses AMI encoding:  11/24/99 EDN-Design Ideas / (added 6/06) Although alternate-mark-inversion (AMI) encoding is well-suited for direct-conversion FM transmission, designers often overlook the technique. AMI, a three-phase, synchronous-encoding technique, uses bipolar pulses to represent logic ones and no signal to...

RF Transmitter:  (electronic circuit added 7/03)

RF/SS Handie Hopper Transmitter Schematic:  (electronic circuit added 7/03)

RFPIC12F675 Transmitter Module:  Microchip Application Note Published 20-Jun-03   (app note added 2/06)

Sensitive FM Transmitter:  (schematic added 8/03)

Shortwave Transmitter:  (electronic Circuit / Schematic added 10/04)

Simple AV (Audio/Video) Wireless Transmitter:  (circuit / schematic design added 6/06)

Simple FM Microphone:  (electronic circuit added 7/03)

Simple RF Transmitter:  (electronic circuit added 7/03)

Simplest RF Transmitter:  (circuit added 9/04)

Single Channel RC Cars TX and RX :  Here is the 9 volt GS transmitter which does not use a crystal. This clever design allows only two transistors to generate both the carrier and  the modulation. Shown below at 27MHz 40MHz and 49MHz: (added 2/05)

Small bug using SMT (surface mount technology):  (schematic / circuit added 05/07)

Small circuit forms Programmable 4 to 20 mA Transmitter:  04/17/03 EDN Design Ideas  /  (added 1/05)  One of the key challenges in the design of 4to 20-mA current transmitters is the voltage-to-current conversion stage. Conventional transmitters use multiple op amps and transistors to perform the conversion function. These approaches have been around for a long time, but they are usually inflexible, have poor power efficiency, and have limited current compliance....

Small Radio Transmitter:  (electronic circuit added 7/03)

Spark gap Transmitter:  (electronic circuit added 7/03)

Stereo FM Transmitter:  AN-543-StereoFMTransmitter-Analog Device Application Notes  (app note added 6/06) 

Surveillance Transmitter Detector:  This circuit can be used to "sweep" an area or room and will indicate if a surveillance device is operative. The problem in making a suitable a detector is to get its sensitivity just right, Too much sensitivity and it will respond to radio broadcasts, too little, and nothing will be heard.