<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Yes, that is the part I was referring to. It actually mentions the third prong on the power adaptor. </div><div dir="ltr"><br><blockquote type="cite">On Jul 6, 2022, at 1:11 AM, Peter Pearson via Synth-diy <synth-diy@synth-diy.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div><a href="https://manuals.fdiskc.com/flat/BigBriar%20Etherwave%20Service%20Manual.pdf">https://manuals.fdiskc.com/flat/BigBriar%20Etherwave%20Service%20Manual.pdf</a></div><br><div>Read page 8 of the service manual where it says - and I'm quoting here - "<b>WHY IS THE POWER ADAPTER GROUNDED?</b>"</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jul 5, 2022 at 7:04 AM Gordonjcp <<a href="mailto:gordonjcp@gjcp.net">gordonjcp@gjcp.net</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">On Thu, Jun 30, 2022 at 02:41:07PM -0400, Peter Pearson via Synth-diy wrote:<br>
> <a href="https://manuals.fdiskc.com/flat/BigBriar%20Etherwave%20Service%20Manual.pdf" rel="noreferrer" target="_blank">https://manuals.fdiskc.com/flat/BigBriar%20Etherwave%20Service%20Manual.pdf</a><br>
> <br>
> The schematic is here. A DC supply won't work. The theremin might be<br>
> fussy about grounding though, so you'll definitely want a center-tap on<br>
> your power adapter. I wouldn't recommend trying to cheat a barrel jack AC<br>
> power adapter in there.<br>
<br>
If you look at the power input circuit, there are only two connections. There's nowhere for a centre-tap to go.<br>
<br>
It's a simple transformer fed into a pair of half-wave rectifiers, same as the various crappy modular PSUs that are kicking around.<br>
<br>
Everyone is making this waaaaaaaaaaaaaaaaaaaaaaaaaaaaaay more complicated than it needs to be.<br>
<br>
A 15V transformer will be fine. It doesn't need a centre tap. Anything over 200mA will be fine.<br>
<br>
-- <br>
Gordonjcp<br>
<br>
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