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.
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
If you have an old cassette player or bought one from a junk shop, you can set up a small table...
This circuit was found in a 70s American documentation. The converter can be of any type and the...