Indicator battery voltage
The indicator allows you to monitor the voltage of the vehicle electrical system in four ranges.
When the battery voltage is less than 11 volts the led is lit red - VD1, with a properly charged battery in the range of 11.1 to 13.2 volts green led VD2, in the range from 13.4 to 14.4 volts the led is lit yellow - VD3, and overvoltage over 14.6 volt red led lights VD4.
Adjustment of the scheme is to adjust the potentiometer 10K range normally charged battery (12...13.8 In). The phototransistor adjusts the brightness of the burning of the LEDs depending on external lighting. Can it is not set, then the brightness is maximum. LEDs can be used in any match the colour.
Publication: N. Bolshakov, rf.atnn.ru