DC Voltmeter-Circuit Diagram, Block Diagram-Basic Guide DC Voltmeter Block Diagram DC voltmeter mainly consists of a dc amplifier apart from the attenuator, as shown in figure. DC voltmeters can further be divided into two categories. 1. Direct Coupled Amplifier DC Voltmeter This type of voltmeter is very common because of its low cost. This instrument can be used only to measure voltages of the order of milli-volts owing to limited amplifier Simple Digital Voltmeter Circuit Diagram using ICL7107 In this project we are going to build a Digital Voltmeter without using any microcontroller we are using a very popular IC for voltage measurement namely ICL7107/CS7107g ICL7107, we can build accurate and very low cost voltmeter. ICL7107 is a 3.5 digit analog to digital converter (ADC) which consumes very low power. LED Digital Voltmeter Working with Circuit Diagram The entire supply to the circuit is given through IC 7107 pins +5V at pin 1, 0V at pin 21, and –5V at pin 26. The LED digital voltmeter working with circuit diagram can be easily understood with this simple overview description below. Digital voltmeter circuit diagram using ICL7107 / 7106 Figure 5 The simple DC digital meter circuit is completely. In Figure 5 is the digital voltmeter circuit designed for general applications. Which it requires the maximum range equal to 200mV. If you want more the voltage range. Which they can do. The circuit for reducing the voltage, the circuit consists of RX, RY, calculated as follows.