This trigger uses two switching transistors that can still be found with some ease. The circuit is from an old documentation and its purpose is to speed up the switching of logic circuits.
This oscillator with base current drop can be used like the well-known grid-dip meters, but which...
This circuit is intended to maintain constant current in a heating element. This element must have...
This circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...