Frequency Doubler (CB21065E)

This circuit was obtained from an Analog Devices manual from the 90's. The integrated circuit is from the time.

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Peak Voltage Detector (CB5157E)
We find this circuit in an old American manual from the 80's. The circuit has a memory that keeps...
High Voltage Power Supply (CB6894E)
This circuit, found in a 1982 documentation, consists of a small inverter based on a Hartley...
Polarity protector (CB23770E)
This relay circuit protects against accidental inversion of input polarity. The circuit was...