Wire Finder (CB21301E)

Found in an Electronic Hobbyist Handbook from the 1990s, this circuit is intended to apply a signal to a cable to enable its location.

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Neon and SCR timer (CB21409E)
Found in an old neon lamp applications manual, this circuit directly triggers an SCR. R and C...
20 MHz filter (CB6735E)
This 20 MHz bandwidth circuit was suggested by the National Semiconductor in 1970 documentation. Modern...
FM Ad Eliminator (CB25038E)
This circuit cuts out ads between songs, based on the fact that the speech signal has small...