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Designing the Portable Party Power Pack v.3.0

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Twellmann:
Hi all,

I'm currently planning my third version of the Portable Party Power Pack, a battery powered amplifier with built USB-charger for cellphones and iPods. The amplifier is based on the lovable :-* ta2020, and is powered by 8 D-cells. I've used the other systems for festivals, the beach and other parties with great results.

This time around I have better access to a machine shop and a working electronics lab  ;D

On the attached photo you can see the basic idea.

I have a few questions, but not the time right now to put them in writing/images.

I've started a thread on one of my questions, but I'm linking to this thread instead.
https://www.eevblog.com/forum/index.php?topic=1927

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