Reply to "Another LED constant lighting question for passenger cars . . ."

Rod StewartOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

stan2004 posted:
gunrunnerjohn posted:

How about 50 for $1.51, about three cents each? eBay: 142908355800
Those are what I use for thru-hole rolling-stock applications. Looks like your pads are spaced about 0.4" so here it is on a 0.1" grid project board. All the listing says is "1/2 Watt" which is an odd way to spec an inductor. In any case these measure in at about 0.7 Ohms (DCR) so no problem wrt current handling.

So check my math on these guys. Based on a resistance of 0.7 ohm, and power limit of 1/2 watt, I am getting a max allowable current of about 837 ma. Sound right? 837 ma across 0.7 ohms give a voltage loss of 0.586 volts, and this times 837 ma = 0.50 watts. Did I get that about right?

If correct, these guys should work for lots of misc. applications, but not engine power pick up of course. For that purpose I use chokes rated at about 3 amps.

Rod

2/10/193:44 PM

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