Telephone dialer (CB8521E)

Using an integrated circuit from the time, we found this configuration in a 90s Radio Electronics.

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Touch switch with lock (CB9573E)
Found in a 1980s documentation, this circuit uses a photo-Darlington. There must be an optical...
Probe Micro Amplifier (CB16358E)
We have here an ultra-simple amplifier stage of just one transistor, which can have some uses on...
Overvoltage and Undervoltage Relay (CB17023E)
This conventional window detector circuit was found in a 1995 documentation. The trigger points, that...