Flasher CA3130 (CB22004E)

Found in an English documentation from 1977, this flasher or pulser circuit drives an LED. The frequency depends on C2.

Sound Intensity Meter (CB11533E)
This ultra-simple meter uses an output transformer and a small speaker as a microphone. The...
Or Gate Operational (CB15104E)
In the figure we have the way to implement a logic gate or (OR) with an LM393. The circuit must be...
Gain 10,000 Amplifier (CB23747E)
This is a circuit with the first commercial Darlington transistor, the 2N626. The circuit is from...