5 to 200 seconds timer (CB21401E)

This circuit was found in a 1967 RCA documentation. The semiconductor components are from the time, and modern equivalents can be tried.

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Comparators for opposite polarities (CB9590E)
This circuit was found in a 1980s documentation, using a comparator from the time. The...
Interval for windshield wiper (CB22188E)
This windshield wiper interval was found in old documentation. The NPN transistor is general...
Common Base RF Amplifier (CB4684E)
This is an RF amplification step for small signals using the common base configuration. The...