Found in a 90's EDN, this circuit provides a current of a few tens of mA. The circuit can generate 15 V from a 5 V input.
This circuit can serve as a basis for a digital mixer or simply for a noiseless switch of audio...
This traditional mixer configuration with a high input impedance was found in a 90’s Popular...
This medium wave radio works with any general purpose NPN transistor. The diode must be made of...