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Old 05-02-2012, 11:24 PM   #1
BigPatBrewer
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May 2011
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Is there a way to go from 110v to power an LED that is rated to 3v? Can I use a resistor? Bear with me, I am still trying to figure out all this electricity stuff. I could seem to find what i was looking for in my searches so far. Thanks in advance!

EDIT: I just found out the LED is rated to 12v

 
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Old 05-02-2012, 11:28 PM   #2
bruin_ale
 
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Pretty sure you want 3V DC power for that LED, not 3V AC. So what you could do is use 110V to power an AC to DC wall wart that outputs 3V (or you could use a resistor to alter the DC Voltage of a wall wort with a higher voltage).

 
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Old 05-02-2012, 11:29 PM   #3
bruin_ale
 
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BTW, might be easier to just use a lamp rated for 110VAC if you don't already have a DC power supply in your system (and have no other uses for one other than the LED).

 
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Old 05-02-2012, 11:53 PM   #4
BigPatBrewer
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May 2011
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The switch I am using, lights up with a LED. The switch is rated to 120v but for some reason, the seller told me the LED is 3V only. I was trying to avoid using a adapter that you plug into the wall if possible

 
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Old 05-02-2012, 11:55 PM   #5
nukonamo
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If it truly is 3v...buy a different switch.

 
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Old 05-03-2012, 12:20 AM   #6
Scubasteve223
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Jan 2012
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A light up switch should be ok if it is rated for 120v idk what that 3v business is. Its the light inside the switch to say its on right?

If you must use a 3v source go to a second hand junk store.. they normally have boxes of wall warts. Better than buying brand new.

 
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Old 05-03-2012, 03:44 PM   #7
cornhole
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http://www.discovercircuits.com/DJ-C...epilotled1.htm

 
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Old 05-03-2012, 10:55 PM   #8
BigPatBrewer
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May 2011
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Quote:
Originally Posted by cornhole View Post
Thanks. I am still learning. Any chance you could explain that diagram a little bit?

 
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Old 05-03-2012, 11:10 PM   #9
Monster Mash
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Quote:
Originally Posted by BigPatBrewer View Post
Thanks. I am still learning. Any chance you could explain that diagram a little bit?
The "0.22uf 250v" is a capacitor, the "1k" is the resistor to reduce the voltage and the 1N4004 is a diode to switch from AC to DC
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Old 05-03-2012, 11:51 PM   #10
BigPatBrewer
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May 2011
Tucson, AZ
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Thanks. So can I basically just wire them in a row before the led?

 
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