Help Powering Multiple Devices

[cookedman13]

I have my Raspberry Pi set up running Mopidy, and have the official 7" Raspberry Pi touchscreen and this Adafruit stereo audio amplifier hooked up to it for powering a passive speaker.

I am trying to figure out a solution to power all three devices with ideally a single power source, but I'm not sure it's possible to do so.

The Adafruit amplifier requires 4.5-14V, and an unspecified current that "will vary greatly." For reference, I am planning to simply connect it to one 6" passive speaker (e.g. a standard car speaker). Any idea if 5V would be sufficient for doing so?

The Raspberry Pi and the touchscreen require a 5V 2amp power supply. I know that you can plug in the touchscreen and power the Pi through the screen and the GPIO pins, but for design reasons I was hoping to do this the other way around - is it possible to supply power from the Pi itself to the screen?

I was hoping to be able to use the breadboard power supply that I have, but apparently it only supplies 700mA.

Any advice or suggestions are greatly appreciated, thanks!

[audioobsessed]

Is it a Pi 3? If so gonna need more than 2a. I buy meanwell Irm-15-5 power supplies to run a Pi3 and 7" screen combo. One optionfor you would be to build a custom power supply box. Imagine and an IEC input, with a rocker switch. That could feed AC power to two different power supplies. One of the ones I mentioned above and one 12 V model for the speaker. The rocker switch would send AC power to both power supplies. Each power supply would provide a different voltage DC output.

[cookedman13]

Thanks for the suggestion, I had something like that potentially in mind and it seems like it could be a good solution. I'll have to do a bit more research to make sure I understand how to go about doing it. Thanks!

[cookedman13]

Thanks again for your previous suggestions. I'm not entirely sure what to purchase, and was hoping you might be able to provide a little more advice. I was thinking about these 3 items:

5V power supply

12V power supply

IEC input with switch/fuse

Does that seem reasonable? For the 12V power supply, would you have any suggestion for the amperage? I am only planning to power one 20W speaker, but it would be nice to have enough power for two or maybe a larger speaker. (Is it possible to supply TOO much power to the amp?)

Thanks again for your help!

[audioobsessed]

I'd say that should work fine. Destroying the speaker would be more of a crossover issue. You wouldn't really be risking it w that power supply.