[sdiy] Power supply for Big Briar Etherwave Theremin

[Didier Leplae]

Yes, that is the part I was referring to. It actually mentions the third prong on the power adaptor. 

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