This symmetrical four voltage source was found in a 1968 Motorola documentation. The circuit is of a type that was commonly used in that time amplifiers.
The integrated circuit used in this amplifier is not common today. The power can be between 4 and...
This circuit was obtained from a 1997 publication. It is an alarm that has a lock and a bistable...
We found this circuit in a 1991 publication. What it does is to amplify a signal with unit gain...