This circuit can be used as an answering password system in a store, office, or other location. The circuit is from Intersil using components of the time. The circuit is from the 80's.
We find this circuit in an American 80's documentation. No further information about the...
This conventional bistable power control circuit using triac was found in the June 1970 Radio...
This old voice circuit suitable for telephones of the time was found in a Radio Electronics from...