Switching circuit (CB9226E)

This circuit was found in a 90's EDN. It can be implemented with either TTL or CMOS logic and used as a shield.

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Digital Volume Control (CB17205E)
This 1998 circuit controls the volume in a stereo system by touching switches. The circuit is for...
Graphic Equalizer 741 (CB25841
E) In this circuit we have the details of a section with the others repeating with the values...
Assisted ignition (CB23557E)
This switching circuit for contact breaker cars was found in a Radio Electronics from April 1964....