hi!..
please help me on what i.c. will i use to have a circuit (funtion is a digital voltmeter)...i'm going to use it on a system to monitor power supplies.
the circuit would be measuring couple of supplies...5V/150A, 12V/50A, 15V/50A, 30V/30A, and 72V/30A....my plan is to interface it with a PIC microcontroller then to a pc....
this concept was got from the harware monitoring of some motherboards like ASUS and VIA...

 

If your plan is to interface it to a PIC then to a PC, choose a PIC with internal A2D to start with - the 16F876 have 5 analogue inputs, plus sufficient other I/O to feed an LCD display and a serial output to the PC.

 

thanks!!..
is that PIC capable to have a high power input AC like for example 5V/150A, or 72V/30A?....

 

The current has nothing to do with it, a voltmeter only measures volts, you can simply use potential dividers (two resistors) to provide the volts ranges you need.