Simple Circuit Diagram With Voltmeter. Even a fast response meter need this circuit since our visual perception won t be able to catch a fast event. If you want more the voltage range.
This is a peak voltmeter circuit. A transistor is a current controlled device so resistance is inserted in series with the transistor q 1 to select the voltage range. The calibration of this circuit is done by adjusting r12 scale sensitivity and r14 zero offset.
This circuit can be viewed as a pulse stretcher which catch fast pulse signal to be measured by a slow response voltmeter.
Here is the schematic diagram of the circuit. Talking about the circuit diagram below the unit is a complete fledged digital voltmeter circuit that are available for calculating direct voltages starting from zero to 199 volts. The resistor r1 and capacitor c1 are used to set the internal oscillator clock frequency at 48hz clock rate at which there will be three readings per second. The circuit diagram for a direct coupled am plifier dc voltmeter using cascaded transistors is shown in figure.
