PCB has compensating resistor R1 for lowering power in the circuit. Two types of resistors can be used with our board.

1. Regular (classic) resistor with two legs. PCB is designed to handle classic resistor with size of no more than 1/8W (0.125W). Larger resistor will not fit on board assembling and will cause additional difficulties installing it. It will have to be fitted vertically. Classical resistor should be installed in two holes marked as R1 on Print Side (PS).

2. SMD class resistor 0805 (2012 in metric) 0.125W. Size 0.079 x 0.049 inch or 2x1.25 mm. For this type of resistor PCB has two mounting pads marked as R1 on the Component Side (CS).

Correct resistance can be easily calculated using online resistance calculator for two LEDs. It is available via the following link.

Resistance calculator

Current parameter of LEDs sold on our website is 25mA, if voltage of each LED in pair is higher than 2.5V PCB with parallel LED connection and installed resistors should be used. 

PCB obtains power through mounted 3-pin connector, where "+" is on the 1st leg marked as +5V. Ground is on 2nd leg which is connected with 3rd leg. As shown on the picture, that allows one by one Ground connection of all indicators used in the system without spending a lot of wiring. PCB has central hole which can be used together with PCB Screw for better mounting to indicator box. 

Please contact us if you want to power up PCBs using 12V power supply. 12V PCBs are available for custom manufacturing.