TB069: RFPIC12F675 Transmitter Module:  Microchip Application Note Published 20-Jun-03   (app note added 2/06)

Telephone Transmitter (FM) :  Receive telephone conversations on any FM radio with this neat little device.  (added 2/06)

Three Transistor FM Radio Bug:  (electronic Circuit / Schematic added 10/04)

Tiny RC Cars TX and Charger :  The transmitter runs on only 3V whereas most others run on more voltage. This dirt cheap item uses non-adjustable inductors so it is not possible to tweak for higher output. The common TX2B chip is manufactured by HIGHLAND (SHENZHEN) ELECTRONICS CO LTD and by REALTEK SEMICONDUCTOR CORP and others. (added 2/05)

Tracking transmitter (nrgkits): 

Tracking Transmitter (reconnsworld):  (electronic circuit added 9/03)

Transmitter accurately Transfers Voltage input:  05/15/03 EDN Design Ideas  / (added 11/05)  When you connect remote sensors to a central process controller, a simple, robust, and commonly used interface is the 4to 20-mA loop. The advantages of this current loop include the simplicity of just two twisted wires that share both power and signal, the loop's high noise immunity in harsh environments, and the de facto loop standard within the process-control industry.

Transmitter senses triple relative humidity figures:  09/26/02 EDN Design Ideas  /  (added 1/05)  The circuit in Figure 1 is a triple, relative-humidity sensor and radio transmitter. Sensors 1 and 2 form two gated oscillators with natural frequencies of 10 and 5 kHz, respectively, at relative humidity of 50%. The gated oscillators use variable resistances R2 and R3, respectively. Together, these two oscillators generate FSK-modulated outputs at output of IC1B, Pin 6....

Transmitter using LM317:  (electronic circuit added 7/03)

TV Transmitter:  A VHF band TV transmitter using negative sound modulation and PAL video modulation. This is suitable for countries using TV systems B and G.  (added 10/05)

Two Transistor Circuit Replaces IC #2:  Linear Technology's recently introduced LTC4300 chip buffers I2C clock and data lines to and from a hot-swappable card. This task is difficult because the IC must work bidirectionally (added 8/03)

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

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

Understanding GSM Transmitter Measurements for Base Transceiver Stations and Their Components:  Aligent Application Note  (added 6/06)

Very stable RF bug:  (diagram added 05/07)

Very stable transmitter than can be carried and move while in use, range is 100-200 meters:  (diagram added 05/07)

VHF Transmitter:  (electronic Circuit diagram added 03/03)

VHF/UHF TV Modulator:  Elektor January1985 /(added 7/02)

Video/Audio Wireless Transmitter #1:  (circuit / schematic added 6/05)

Video/Audio Wireless Transmitter:  circuit diagram and project description (added 5/02)

Wireless doorbell for operation on 303MHz, transmit range is around 30 meters (100ft):  (diagram added 05/07)

Wireless Microphone (~antoon):  (circuit added 9/04)

WLW 500KW Transmitter Schematic:  (electronic circuit added 7/03)

zero voltage drop heavy duty power supply for SSB:  (added 5.07)