Neon Divider (CB6835E)

Found in ancient American documentation, this circuit produces a pulse every 8 Hz of a 400 Hz signal.

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Time control (CB8340E)
This timer circuit was found in a 1980s American documentation. Transistors and SCR support modern...
Time ramp (CB8937E)
Found in a 1960s documentation, this circuit uses an operational amplifier from the time and a...
Audio Relay (CB13614E)
The displayed relay operates with an audio signal applied to the input. The transistors can be...