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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Christmas Allegory (CB23759E)
This circuit was found in Radio Electronics magazine from October 1966. It consists of a rhythmic...
Temperature controller LM3911 (CB21281E)
This circuit is from a Popular Electronics from the 90's. The circuit provides an output for a...
24 and 27 V power supply (CB18899E)
The transformer of this unit found in an old Japanese documentation can have 22 to 25 V of...