This circuit was found in a 1967 US publication. In it we have the implementation of a ring counter using only relays. Relay free contacts can trigger indicator lamps or LEDs.
This circuit mutes a system when a phone call is received. The circuit is from a Radio Electronics from...
The circuit shown is from the National Semiconductor's Linear Applications Handbook. The CI is not...
This circuit was found in a Texas Instruments optoelectronics manual and can work with any...