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bitem2k said:What is the best way to run devices from a cars battery?
Should i wire into the fuse box?
thanks.
audioguru said:50A? A little LED will try to draw 50A if it doesn't have a current-limiting resistor.
Never mind.bitem2k said:If batt voltage is 12 - 14 v should I not connect 3 3.8v leds in series with the resistor, with the diode?
Correct me if im wrong but I looked at the 1n4148 spec sheet, at a graph and it says the that the voltage drop that occurs across the diode when 60 mA is flowing is 0.8v
so I a plan to run 3 parallel chains of series leds, resistors, and diodes, this is my calculation (forgive me if this is horrendously wrong).
13.8 (max v) - 3(3.8) - 0.8v = 1.6v
R = 1.6v / 0.02A = 80hm:
so 3 * series chain =
3(0.02A) = 60mA
is this right?
thanks mate.
No.3v0 said:Why not do it like this ?
Use as many LEDs in series as you need to get to about 10V. Use a variable voltage regulator to provide that voltage. The car provides enough volts to regulate down to 10 in all cases. The LEDs would have constant brightness and you do not need any resistors or non LED diodes to drop the voltage.
audioguru said:Two or three or any number of things in series all have the same amount of current.