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.
The circuit presented uses the high-power operational amplifier LM12, which is currently not an...
Suggested by Philips documentation from 1968, this circuit uses components from the era that can...
This highly sensitive circuit causes one relay to be closed when the other is open or still...