Transformerless Wideband Switch (CB6457E)

We found this chopper circuit in a 1967 publication. The transistors are of the time, and current equivalents can be used.

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Highly Sensitive Laser Alarm (CB25977E)
This circuit is more sensitive than the previous one, triggering when a laser beam that hits the...
Adjustable time chaser (CB6794E)
This circuit was obtained in a 1967 Electronics World. The components are still common today, the...
Touch Activated Motor II (CB1548E)
The simple touch of the fingers on a sensor causes this circuit to drive a motor that goes into...