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.
This circuit was obtained in a 1973s documentation. The transistors may be BC558 for the PNP and...
We found this circuit in a 1977 CMOS oscillators documentation. The power can be sourced with...
This circuit was found in an English magazine from 1979. The magazine no longer exists, but the...