Possible to power OPi0 via header? Also, sound question


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Hey Guys,

 

IM finally trying to make use of my OPi0 and Im planning on creating a daughterboard/hat/shield similar to the expansion board they sell, but with only the bits i need.  One thing i'm wondering is if its possible to feed the power (5v) via the pins on the expansion board and not using the OTG input.  Im trying to keep it as clean as possible and dont want to have the OTG connection for power.  Is the regulator only on the OTG?

 

Last I checked, my power supply gives out a steady 5.3v feed @5amps (driving some power hungry pixels).

 

In regards to sound.  I wanted to use an LMA386 amp on my custom daughter  board to boost the output for a 4 ohm speaker i'm going to use.  I noticed on the expansion board that two pins are use for left/right channel output.  Since its a mono speaker, i'll only need one channel.  im assuming that should be ok right?  or should I bridge the left/right and pass that to the amp?

Thanks for your time.

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One thing i'm wondering is if its possible to feed the power (5v) via the pins on the expansion board and not using the OTG input.  Im trying to keep it as clean as possible and dont want to have the OTG connection for power.  Is the regulator only on the OTG?

Yes, it's possible. There are only extra protection elements separating OTG from DCIN-5V, you can check the schematic for the details.

 

In regards to sound.  I wanted to use an LMA386 amp on my custom daughter  board to boost the output for a 4 ohm speaker i'm going to use.  I noticed on the expansion board that two pins are use for left/right channel output.  Since its a mono speaker, i'll only need one channel.  im assuming that should be ok right?  or should I bridge the left/right and pass that to the amp?

You can try to bridge the outputs (probably via resistors) or simply downmix your sound to mono in ALSA/pulseaudio config and use only one channel.

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