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 shown simulates a programmable unijunction transistor (PUT). Transistors may be common...
This electronic car lock was found in a 1988 magazine. It uses a code key that must be activated to...
The diagram shows an AND gate implemented with an LM3900 transconductance operational. The circuit is...