[sdiy] Power supply for Big Briar Etherwave Theremin

[Gordonjcp]

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