This simple injector and signal follower employs a high impedance headset. Transistors can be of general use. The circuit is from old American documentation.
This circuit was found in an old documentation and can be powered by a solar panel. The touch...
This simple circuit can be used on both 110V and 220V mains. We find it in an 80's Electronic...
This circuit was found in a 1980s instrumentation publication and can be applied to virtually any...