Buffer for VFO (CB7282E)

This circuit was obtained in a Popular Electronics from the 90's. The gain depends on R4 and R3. Transistors are general purpose types.

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External Shutdown Regulator (CB4857E)
A high level on the input of this circuit causes the trim voltage adjusted output voltage to drop to 1.2...
Car Alarm (CB4412E)
We found this alarm in a 1992 documentation. The circuit has several timings and the relay can...
Wiper Interval Switch (CB25302E)
This windshield wiper interval switch was found in the April 1990 issue of Radio Electronics...