Triggered Oscillator (CB21252E)

This trip switch circuit was found in a Popular Electronics from the 90's. The frequency basically depends on C1 and R1.

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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...