Modifications to LED Bar Graph Volt Meter for 12volt batteries(and Battery banks) Answered
Hi I found this LED bar graph voltmeter at
I want to understand how to build this voltmeter.But please read the solorb website page before posting, for more info.
1. What is an offset resistor???
2. What is a 'span'(see pic notes)
2. For 12v operation,short J2 and J5,but what to do to all the other unconnectd 'J 'wires, just join the wires or what?
3.To use without the Blue LEDs, just remove the two LEDs or any other connection/shorting is required????
4.What is switch S1 used for ???, I do NOT want to manually push switches while the meter is in operation.
5.How to stop the blink-LED mode, I want the constant display mode always.
6.There is also two arrows shorting two pins on the IC with words 'Adjust for 12v'?????????
7.How to calibrate the circuit accurately???
PS:- If you want to know more about a larger part of this project,visit https://www.instructables.com/community/Voltage-Regulator/