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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Sequential Switch (CB9109E)
The presented circuit was found in a 90’s Electronic Engineering. The circuit is based on CMOS...
General Purpose Phone Amplifier (CB974E)
We find the original version of this circuit in an English publication (1986). It is a...
LM1875 Non-Inverting Composite Amplifier (CB26268E)
Found in a 1990s Electronics Now, this circuit uses a period-specific integrated circuit that...