Operating at a frequency of around 180 kHz, this transmitter was found in a Science & Electronics of 1970. The coil has 34 turns of 22 wire. The transistor can be the 2N2222.
Found in a 1964 Electronic Design, this circuit generates pulses based on an avalanche diode of...
This circuit is from 1990 documentation. It can be implemented with BC548 transistors instead of...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...