If you want to bring LED blue stars, connected to the fire 12 volts, so it can instead of from the formula as follows.12V - 2.5V = 9.5V.Then the food with the flow is 20 MAH by converted into unit amp by dividing the 1 000, was 0.02 amps.9.5 / 0.02 = 475.The desired resistance value is 475 ohm.But since the 475 ohm. No distribution, can pick up nearby, such as 470 or 510 ohms.
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