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.
Varicap or varactor is the basic component used in this circuit of an American 80's documentation. The...
This old fashioned amplifier can source some watts to a low impedance loudspeaker. The circuit...
Using a 555 this circuit was found in old documentation, but it is still valid. | Clique na imagem...