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.
Found in the 2005 Linear Technology Application Manual, this circuit controls the torque of a...
This circuit was found in a 90's Electronic Design. It takes advantage of the nonlinearity...
We found this circuit in an English publication of 1976. It can be easily assembled by changing the...