Feb 24, 2004 #1 M MoDsQuaD Limp Gawd Joined Aug 11, 2003 Messages 389 Hey what size resistor do I need for these switches. schematics show the led as 2v, 20mA, so 75 ohms?
Hey what size resistor do I need for these switches. schematics show the led as 2v, 20mA, so 75 ohms?
Feb 24, 2004 #2 T TekMonkey n00b Joined Aug 15, 2003 Messages 43 Dude, just use a LED calculator like this.
Feb 24, 2004 #3 C codeflux 2[H]4U Joined Mar 28, 2002 Messages 2,530 no need for LED calculator. (12Vsupply - 2Vled) / 20mA = 500Ohm. nearest resistor is 560Ohm, or make a composite one to be 500Ohm (two 1kOhm in parallel) if you want maximum brightness.
no need for LED calculator. (12Vsupply - 2Vled) / 20mA = 500Ohm. nearest resistor is 560Ohm, or make a composite one to be 500Ohm (two 1kOhm in parallel) if you want maximum brightness.
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