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Author Topic: Keywiz help  (Read 1056 times)

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Firehead

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Keywiz help
« on: June 18, 2008, 05:17:45 pm »
Hi guys! How many led can be connect in parallel to the 5V+ on a keywiz usb?

Firehead
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Franco B

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Re: Keywiz help
« Reply #1 on: June 19, 2008, 02:26:47 am »
It depends on the LEDs forward voltage and the LEDs forward current.

If you know the specs of your LEDs you can use [this] calculator to design a parallel array.

Note, you want to keep the total current drawn under 500ma so you don't damage your PC.

If I put in the specs of some of the LEDs I have into that calculator (3.4V, 30ma) it looks like I would theoretically be able to connect 16 of those LEDs in parallel whilst drawing 480ma.
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