This protection circuit for symmetrical 28 V power sources was found in a 1968 EEE documentation. The circuit can be adapted to use modern equivalent components.
This oscillator with emitter follower was found in an American documentation from the 80's. The...
We found this circuit in 2005 Linear Technology documentation. The integrated circuit is LT1787...
The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook. The...