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Olimex Support Forum

OLinuXino Android / Linux boards and System On Modules => A20 => Topic started by: phuihock on November 21, 2014, 05:39:35 AM

Title: Power jack and polarity
Post by: phuihock on November 21, 2014, 05:39:35 AM
Hi,
I'm new here. I would like to power my A20 board using power jack but can't determine if it is center positive or negative.

Will center positive 5V/3A power adapter work?

Thanks.
Title: Re: Power jack and polarity
Post by: dave-at-axon on November 21, 2014, 06:23:49 AM
5V will not work. The range is 6 to 16V dc and centre pin is positive. See the schematic of the A20 for details.

With 5V input, the 5V DC-DC won't operate correctly.

Use a 12V 2A supply. It will draw around 500mA with an LCD connected and the 2A rating will allow surges.
Title: Re: Power jack and polarity
Post by: Gerrit on November 21, 2014, 01:40:17 PM
Quote from: phuihock on November 21, 2014, 05:39:35 AM
Hi,
I'm new here. I would like to power my A20 board using power jack but can't determine if it is center positive or negative.

Will center positive 5V/3A power adapter work?

Thanks.

It works for A20-OLinuXino-LIME and A20-OLinuXino-LIME2 boards these are 5V center positive
like already said A20-OLinuXino-MICRO is 12V
Title: Re: Power jack and polarity
Post by: phuihock on November 21, 2014, 03:32:40 PM
Sorry, I forgot to mention it is A20-OLinuXino-Lime board. Thanks!
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