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.

Half Wave Rectifier (CB5164E)
We found this circuit in an old documentation. The operational amplifier of the time can be...
Light Level Control (CB5301E)
This is actually an automatic dimmer we find in an American 1980s documentation. The triac must be...
Shunt Motor Control (CB4250E)
This circuit, from the ON Semiconductor Thyristor Manual, controls both the speed and direction of...