Reference voltage source (CB8799E)

Found in a 1967 Ferranti documentation, this regulator makes use of an operational amplifier of the time. The output current is only 5 mA.

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SCR mechanical drive (CB6572E)
This contact or reed switch actuation was found in a 1964 Electronic Design. The circuit can be...
Simplified 2-bit decoder 7400 (CB22422E)
This is the previous version, but with a simplification given by the use of the 7404 and 7408...
Microphone Signal Conditioner (CB15601E)
In the figure we present a circuit of a microphone signal conditioner using the SSM2167 integrated...