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Main => Main Forum => Topic started by: markronz on September 23, 2013, 06:18:09 pm

Title: mA for 12v LEDs from GGG
Post by: markronz on September 23, 2013, 06:18:09 pm

Hello everyone, hoping someone can help me out here.  I have this switching power supply from GGG:
http://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=93&products_id=364 (http://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=93&products_id=364)
And I have 16 of the stealth illuminated pushbuttons:
http://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=73&products_id=396 (http://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=73&products_id=396)

The LEDs for these buttons are 12v.   I would like to put a fuse on the 12v power wire, between the power supply and the LEDs.   What I don't know is how to estimate what Amperage fuse I need to get.   I don't have a multimeter, so I was hoping someone might know the mA usage for these 12v LEDs?  Or might be able to calculate what size fuse I should get?   Any help would be appreciated.  Let me know if you have any questions or need any more information!

Title: Re: mA for 12v LEDs from GGG
Post by: matsadona on September 24, 2013, 04:48:40 am

A typical LED is approx 20mA, but since I don't know the exact model it is hard to be more specific.
But even if it is 30mA you will not exceed 1A with 16 of them (16*0,03=0,48), so in this application I would use a 1 or 2 A rated fuse.
The fuse is for shortcut protection, so it doesn't matter if it is a little higher.

Title: Re: mA for 12v LEDs from GGG
Post by: markronz on September 25, 2013, 08:38:03 pm

Thanks for the tip.   Randy from GGG got back to me and said the LEDs for those draw less than 20mA each.   So he said for 16 of them, we'd probably be fine with a 0.5A fuse.   Thanks for your help!