Windscreen Wiper Interval timer (CB6043E)

This circuit was found in a former Popular Electronics. The timing is set on the potentiometer and the relay is sensitive to 12 V.

Two-transistor regenerative receiver (CB20568E)
Details of the coil of this two-transistor generative receiver were not given. We found it in a...
Instrumentation Amplifier TL082 (CB901E)
This very high input impedance circuit is suggested by Texas Instruments. The circuit can be...
High Speed Buffer (CB4991E)
This circuit from an 80's publication also features low input capacitance. FET can be a modern...