This sensitive circuit for triggering relays was found in an old English publication. It works with alternating signals applied to its input. Transistors are general purpose types.
This circuit has a gain of 34 dB and a good power to be used as an audio booster in cars. The...
This circuit was obtained from Dutch documentation from 1967. It uses transistors of the time...
Found in an Electronic Design this circuit controls a headlamp by triggering a time determined by the...