wiring leds

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i am an idiot

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Joined: September 21, 2006

Location: Louisiana, United States

Posted: January 28, 2009 at 10:28 AM / IP Logged

Howie, you DO have an edit button at the bottom of your post, if of course it was the last post in the thread.

KPierson

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Joined: April 14, 2005

Location: Ohio, United States

Posted: January 28, 2009 at 11:03 AM / IP Logged

I wouldn't think switching speed would be a concern at all as most relays switch in the low mS range - plenty fast enough for an alarm LED. The issue here, though, is current draw. If you use an electromechanical relay you're going to kill your battery in a short time. If you use a reed relay you will get better results, but the ideal component would be a transistor - extremely small current draw and no significant "wasted" current.

The other thing to think about is the LEDs you are going to use. If you use LEDs that draw 20mA and you wire 5 of them up that would be a significant additional load to the battery (roughly 25mA average draw with 25/75 on/off cycle while flashing).

I, personally, would look for LEDs that are under 10mA a piece and drive all the LEDs in parallel off of one transistor (like a 2n3906 assuming the LED control output is (-)).

Kevin Pierson

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wiring leds

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