This circuit amplifies signals from 0.5 Hz to 300 kHz. We found it in an old documentation. Equivalent transistors may be used. The gain is 20 dB.
This circuit was found in a 1966 publication. Its purpose is to identify high voltages by lighting a...
Found in a 73 magazine for radio amateurs of the 90s, this circuit provides a 2 kV voltage with 7.5...
This sequential circuit of LEDs was found in a Popular Electronics from the 90s. The circuit can be...