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.

Shunt motor control (CB7940E)
This control for 1/15 HP motors with 5,000 rpm for 115 V power grid was suggested by a Motorola...
15 A Protected Regulator LM123 (CB14511E)
The circuit below is found in the manuals of several manufacturers in the LM123 series of...
Microphone Amplifier (CB20008E)
This configuration found in a Motorola documentation consists of an experimental circuit that uses...