power question

i currently use lcd panel meters (dc volts) and i convert them to display the ohm settings from a pot

now i like a big jerk order new meters and they are not the same 5v dc model they are 9vdc and for some reason can not share a comman ground

how can i make a isolated ground off my pc board so i dont need 2 power supplies

thanks
example
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Do you have a model/part number for the meters?

i use a bunch diff meter my ? is in how to supply a seperate isolated ground

you can supply it with 5V instead of 9v, there is a 7805 in the picture which means it operates in 5V, remove 7805 and put 5V on VDD line

the meter i using is not one in pic i bought a lot of a model only does 9v dc and needs isolated


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