This high-sensitivity circuit was found in a 1980s documentation. The source can be a 9 V battery with a splitter to make it symmetrical. The shock can be 200 uH or more.
Found in Elektor Electronics from the 90s, this circuit produces the tone of 1 750 Hz for calling VHF...
Maxim MAX20056B 6 Channel High Brightness LED Controller Maxim Integrated makes available through...
This 20W amplifier was found in 283 circuits from the 90s. The MOSFET admits equivalents. The...