Transistor Voltmeter (CB1412E )

    The purpose of this circuit is to increase the sensitivity of a common multimeter in its voltage range. The circuit makes use of a germanium transistor, but we can mount it with a BC558; The circuit is powered by two batteries. We can also use a milliammeter to get a complete instrument. The sensitivity obtained is 150 kohms / volt. The circuit is from an old Argentine publication of the 70's.


Circuit Bench