Light out switch (CB8331E)

This highly sensitive circuit was found in a 1967 General Electric SCR manual. Equivalent components can be used.

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Radiation Monitor (CB4561E)
This circuit was obtained from an 1974 Everyday Electronics magazine. The circuit is still current as...
Servo speed control (CB8956E)
Found in a 1970 documentation, this circuit makes use of 741 operational amplifiers that are...
Programmed amplifier (CB7129E)
This digitally programmed gain amplifier was obtained from Signetics documentation from the 1980s....