Do you have a link to the "instructable"? Some of the ones you find should 
be called "DESTRUCTABLES"

On Tuesday, February 10, 2015 at 12:44:02 AM UTC+11, cmc...@gmail.com wrote:
>
> Hi,
>
> I have a BeagleBone Black and Shield Relay board 5V, i want to use this 
> shield to control a contactor but the GPIO in BBB are 3.3V, i see an 
> instructable that i can modify with a shunt in the Leds control this relays 
> with 3.3V, do you think it´s enough to do that and safe for my bbb?
>
> Thanks,
>

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