This simple injector and signal follower employs a high impedance headset. Transistors can be of general use. The circuit is from old American documentation.
Suggested by Mullard in an old documentation, this circuit is based on a common phototransistor and on...
This filter rejects 50 Hz signals. The circuit was suggested by the Texas Instruments Linear...
The configuration shown in the figure uses two PNP transistors to activate the load when the input...