Medium wave range booster (CB21677E)

This circuit is from a 1960 book by Hugo Gernsback. The transistors are germanium from the time.

70 W BTL Amplifier (CB18069E)
This circuit is from 2005 documentation. The integrated amplifier circuit must be mounted on a...
Red alert (CB8441E)
Found in a 90s American documentation, this circuit mimics the Enterprise warning signal from the...
IR Event Counter - Receiver (CIR3250E)
This circuit came out in a Modern Electronics from June 1990. In it we have a low frequency...