This high impedance circuit was found in 1967 documentation by Ferranti. The original operational amplifier is from that time. The circuit can be implemented with modern equivalents.
This crystal radio or galena was found in an English documentation from the 70's. The diode must...
This circuit that uses only discrete components (transistors) mimics the sound of an American...
For bench use, this circuit functions as a bistable safety switch. The circuit is from a Radio...