<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr">Thanks. I think these last two responses put this idea to rest for me, as my main objective was cleaner power. </div><div dir="ltr"><br><blockquote type="cite">On Dec 22, 2021, at 10:54 PM, Chromatest J. Pantsmaker <chromatest@azburners.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">I've seen people create DC-DC supplies taking power from 5V battery banks (for charging your phone, etc.) and running entire live rigs from that.<div><br></div><div>I think having a single easily swappable battery would be better than having one for each voltage. You can then possibly just plug your DC-DC supply into a large amperage 5V wall-wart.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Dec 22, 2021 at 2:38 PM Oren Leavitt via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I've seen people use batteries to power small modular synths.<br>
<br>
Several years ago I've ran a small synth with 10 low current analog <br>
modules plus an analog keyboard interface directly from two 12 volt <br>
DeWalt cordless drill battery packs one each for the V+ and V- rails. <br>
After playing on it for a few hours the V+ battery was at about 80% <br>
charge and the V- battery was still at full charge. This was an NiMH <br>
battery pack. I forget what the mAH rating was..<br>
<br>
- Oren<br>
<br>
On 12/22/21 2:41 PM, Didier Leplae via Synth-diy wrote:<br>
> I’m curious about the idea of using batteries for eurorack power. I am not an electrical engineer, so correct me if I’m wrong in thinking that battery power could potentially be very clean compared with the cheap power supplies many of us use.<br>
> Plus, of course the portability would be another great benefit.<br>
><br>
> Given recent advances in rechargeable battery technology, I wonder if it could be practical and not terribly expensive.<br>
><br>
> I’m assuming you might need two or even three separate batteries to get the +12 , -12 and +5 volt supplies.<br>
><br>
> Perhaps someone has done this that I’m not aware of.<br>
><br>
><br>
><br>
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