The circuit presented is from the Motorola Linear Databook of 1990. The integrated circuit is a transconductance operating and the power supply need not be symmetrical.
This interface shield circuit is from the 1983 Intersil Databook. The components used are uncommon...
We found this circuit in an old European documentation. Transistor TR1 can be BC548 and TR2 can be...
Very rapid brightness changes or flares that occur on the sun can be detected with this circuit that...