K
Ken C
- Jan 1, 1970
- 0
I am trying to determine the optimum arrangment for multiple LED's
powered by a 12V battery/alternator system on a motor vehicle.
I could mate each LED with a 500 ohm resistor, which is how they came
from the HK eBay vendor. This will waste 2/3 of the energy consumed
and might create a heat problem if I pot the electronics in epoxy.
I could put three LED's in series with a 150 ohm resistor, but they
would significantly brighten and dim as the vehicle's voltage ranged
between 12.5 volts (engine off) and 15 volts (alternator charging).
I am leaning toward using one 7808 regulator feeding multiple
clusters, with each cluster containing two LED's in series and a 50
ohm resistor. This would put most of the energy loss in the
regulator, which I can put in a protected spot with a heat sink. The
constant 8V would solve the variable brightness. The regulator, rated
at 2.2 amps, could in this fashion illuminate over 200 LED's, which is
more than enough.
Any suggestions?
Ken C
powered by a 12V battery/alternator system on a motor vehicle.
I could mate each LED with a 500 ohm resistor, which is how they came
from the HK eBay vendor. This will waste 2/3 of the energy consumed
and might create a heat problem if I pot the electronics in epoxy.
I could put three LED's in series with a 150 ohm resistor, but they
would significantly brighten and dim as the vehicle's voltage ranged
between 12.5 volts (engine off) and 15 volts (alternator charging).
I am leaning toward using one 7808 regulator feeding multiple
clusters, with each cluster containing two LED's in series and a 50
ohm resistor. This would put most of the energy loss in the
regulator, which I can put in a protected spot with a heat sink. The
constant 8V would solve the variable brightness. The regulator, rated
at 2.2 amps, could in this fashion illuminate over 200 LED's, which is
more than enough.
Any suggestions?
Ken C