Automotive LED Voltage Indicator Circuit
The circuit is a voltage indicator for automotive. Connecting this circuit to the battery of your vehicle, you will always know at a glance the approximate voltage available. An indication of battery voltage is useful to the motorist for monitoring the battery's capacity to deliver current, and as a check on the efficiency of the dynamo or alternator.
Threshold voltages of the LEDs are set by two Zener Diodes (D6 & D10) plus two further diodes
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