[Led display Digital Voltmeter question]

Hi MP,
thanks for the attachment

I manage to solved the negative sign by grounding the pin 30 (also can be connected to pin 21). the minus sign goes off.

But still can't rectify the zero setting problem, anyway the VM works find and accurate when put on load,

[Led display Digital Voltmeter question]

Hello MP

The different is about 5 to 5.5v short with tunning to zero, the last digit still flicking between one and zero, if witout flicking (zero is stable) is about 6v less

although I'm able to set zero, the minus sign is always appeared, but when loaded with current to read the voltage, the minus will go off,...any answer?

Dan

[Led display Digital Voltmeter question]

Hi, After reading all the experts building their own voltmeter. (using the ICL7107)
I decide to make a try and follow all the intruction...BINGO ...It's works with accuracy ...BUT one problem, I can't adjust adjust to Zero setting (without any load), always read as minus 00.1/00.2 If I tune to zero the reading with load will not accurate.

Anybody know the faults of have the answer?