Expanded Scale 12v Battery Voltage
The circuit below
expands the battery voltage monitoring scale for a 12v battery so a more accurate
voltage reading can be made. The numbers printed onto the face of a standard 0v to
5v meter are changed so the scale ranges from 10v to 15v.
The circuit uses an operational
Amplifier and a voltage regulator to perform the level shifting and rescaling of the
battery voltage so the output varies from 0v to 5v with an input voltage of 10v to 15v.