Hi everyone,hope somebody can help.
im trying to convert a touch screen gambling machine into arcade machine and would like to build an led light panel on a 300*150 pcb.
i have blown one set of leds up already lol.
p.s. is a 12v regulated inline,laptop type,5a max which im using to power up pc speakers(sound is sorted now)and i would like to run light panel off same supply as there seems to be plenty overhead.
im after making a panel of 30 white leds,specs of which are forward v 3-0-3.4(max4.0) reverse current 20ma, set out as 10 strings of three,series parallel arrangement.
im keen after frying last set of leds using series resistor technique,to use current regulation with resistor value of which to set 20ma output.
i would be grateful if someone would check over my specs to try and prevent another load of friodes!!
ie forward voltage ok? regulator dropout taken into consideration etc,am i ok having 10 lm317 one per string?
regards russ
im trying to convert a touch screen gambling machine into arcade machine and would like to build an led light panel on a 300*150 pcb.
i have blown one set of leds up already lol.
p.s. is a 12v regulated inline,laptop type,5a max which im using to power up pc speakers(sound is sorted now)and i would like to run light panel off same supply as there seems to be plenty overhead.
im after making a panel of 30 white leds,specs of which are forward v 3-0-3.4(max4.0) reverse current 20ma, set out as 10 strings of three,series parallel arrangement.
im keen after frying last set of leds using series resistor technique,to use current regulation with resistor value of which to set 20ma output.
i would be grateful if someone would check over my specs to try and prevent another load of friodes!!
ie forward voltage ok? regulator dropout taken into consideration etc,am i ok having 10 lm317 one per string?
regards russ