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Simple Voltmeter(BC554)

2015-01-08 22:38  
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This article describes the Simple Voltmeter (BC554). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: BC554.

This circuit provides a simple means to determine the voltage of a low-impedance voltage source. It works as follows. P1, which is a 1-W potentiometer, forms a voltage divider in combination with R1. The voltage at their junction is buffered by T1, and then passed to reference diode D1 via R3. D1 limits the voltage following the resistor to 2.5 V. An indicator stage consisting of T2, R4 andLEDD2 is connected in parallel with D1. As long as the voltage is not limited by D1, theLEDwill not be fully illuminated. This is the basic operating principle of this measurement circuit.


Figure 1 

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