[sdiy] Power supply for Big Briar Etherwave Theremin

[Peter Pearson]

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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