Posted on Apr 1, 2013

This transmitter can be used for transmitter hunts, for remote key finding, or for radio telemetry in model rockets. It can be tuned to the two meter band or other VHF bands by charging Cl and Ll. 11 is four turns of #20 enameled wire airwound, 0.25 inch in diameter (use a drill bit), 0.2 inch long, centertapped. The antenna can be 18 inches of any type of wire. IC2 functions as an audio oscillator that is turned on and off by IC1 about once per second.

Click here to download the full size of the above Circuit.

The range of the transmitter is several hundred yards.

Leave Comment

characters left:

New Circuits



Popular Circuits

Multipattern Running LEDs
FM Wireless Microphone
Final Project
Softrock RX + Xtall V9.0 USB Control Stage
dcf77 preamplifier schematics
Wire loop alarm
Hacking an alarm clock
Simple Transistor Amplifier Circuit Schematic and Explanation
Metal detector 7
High resolution dithering bar graph display