Monitors battery voltage Three-LED Display Circuit diagram: Parts: R1,R3,R6 1K 1/4W Resistors R2 100K 1/4W Resistor R4,R5,R7,R8 3K3 1/4W Resistors D1 Red LED (Any dimension and shape) D2 Amber LED (Any dimension and shape) D3,D4,D5 1N4148 75V 150mA ...