PC address decoder (CB20536E)

This TTL decoder circuit for PC ports was found in a document from 1992. The power supply can be PC's own circuit.

Fiber Optic Motor Control (CB6232E)
This circuit was found in an 80's General Electric documentation. The circuit uses components from the...
Three Decades Wien Bridge Oscillator (CB14908E)
This oscillator can be used as a signal generator in a workshop, generating sinusoidal signals from...
2 A photo relay (CB8260E)
This circuit is from a 1970 General Electric documentation. It can be found with variations on this...