Re: need help with low voltage led circuit
From: John Larkin (jjlarkin_at_highSNIPlandTHIStechPLEASEnology.com)
Date: 09/28/04
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Date: Tue, 28 Sep 2004 15:00:28 -0700
On 28 Sep 2004 21:18:50 GMT, tgriff346@aol.com (Tgriff346) wrote:
>I need to build a board with painted animals( got it) with led eyes that light
>up at night. I've tried to wire it up, but the led bulbs keep burning out. I am
>using a 9 voltbattery. Any wiring suggestions?
Just two led's? Connect them in series, with a resistor in the
circuit.
Battery+-------resistor------led1------led2-------battery-
A K A K
A = led anode
K = led cathode
try 470 ohms for the resistor to start. The lower the resistance, the
brighter the led's and the shorter the battery life. Don't go below,
say, 150 ohms. The limiting case is R=0, infinite brightness, dead
LED, which is what you're doing now.
John
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