The circuits built into the IC are an analogue to digital converter, a comparator, a clock, a decoder and a seven segment LED display driver. The circuit as it is described here can display any DC voltage in the range of 0-1999 Volts.. Because the M4430 Digital Voltmeter Ammeter requires a supply voltage between 4 and 30V for its internal circuitry through its thin red and black wires, so the thin red positive wire now cannot be directly connected with the input positive which may be higher than 30V. If you do, the meter will burn.
 Phase Digital Voltmeter Wiring Diagram and Connection.png "Digital Voltmeter Wiring Diagram and Connection Procedure ETechnoG")
![[DIAGRAM] Led Wiring Diagram Of Voltmeter](https://images-na.ssl-images-amazon.com/images/I/71RfCpx%2BlsL._SL1500_.jpg "[DIAGRAM] Led Wiring Diagram Of Voltmeter")
The circuits built into the IC are an analogue to digital converter, a comparator, a clock, a decoder and a seven segment LED display driver. The circuit as it is described here can display any DC voltage in the range of 0-1999 Volts.. Learn how to build a simple LED voltmeter circuit using only Zener diodes and LEDs which can be used to indicate different DC voltage levels.