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Main => Main Forum => Topic started by: Firehead on June 18, 2008, 05:17:45 pm

Title: Keywiz help
Post by: Firehead 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

Title: Re: Keywiz help
Post by: Franco B 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 (http://led.linear1.org/led.wiz)] 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.