This display uses ten LED's to display a voltage range from 10.5 to 15 volts. Each LED represents a 0.5-volts step in voltage. The heart of the circuit is the LM-3914 dot/bar display driver. trimmer potentiometer R5 is adjusted so that 7.5 volts is applied to the top side of the divider. Resistor R7 and diodes D2 through D5 clamp the voltage applied to the LED's to about 3 volts. A lowpass filter made up of L1 and C2 guards against voltage spikes. Diode D1 is used to protect against reverse voltage in case the voltmeter is hooked up backward.
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