Debouncer (CB9277E)

This circuit was found in a 1967 American documentation. The switching diode (tunnel) used is an uncommon component today.

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Compensation Integrator (CB14107E)
The circuit presented is from the National Semiconductor's Linear Applications Handbook of 1994. We...
12 V x 1 A Power Supply (CB24821E)
This is one of the many versions we have of a 12 V power supply with the 7812. We found it in the...
Automatic fader (CB8432E)
This fader or fader was found in a 90s Popular Electronics. The circuit uses transistors that are...