[sdiy] Power supply for Big Briar Etherwave Theremin

Peter Pearson electrocontinuo at gmail.com
Thu Jun 30 20:41:07 CEST 2022


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.

On Thu, Jun 30, 2022 at 2:24 PM Mike Bryant <mbryant at futurehorizons.com>
wrote:

> You’d need to check the internal circuit, but you may find a 12 or 18V DC
> switchmode PSU would do the job.  Really depends on the internals and
> whether it actually derives anything from the 50/60Hz
>
>
>
>
>
> *From:* Synth-diy [mailto:synth-diy-bounces at synth-diy.org] *On Behalf Of *Didier
> Leplae via Synth-diy
> *Sent:* 30 June 2022 18:10
> *To:* Synth-diy Mailing List
> *Subject:* Re: [sdiy] Power supply for Big Briar Etherwave Theremin
>
>
>
> I would imagine what’s indicated on your power supply must be correct. I
> also found another image online of a power supply and it had the same
> pinout. Perhaps the schematic has an error or perhaps there was another
> version. I should be able to open up the theremin and see if pins 2 and 3
> are both connected to ground.
>
>
>
> Now, does anyone have a suggestion for building a 14vac 200ma power
> supply? Or if I could find something with those specs I could put a 5pin
> din connector on it
>
>
>
> On Jun 30, 2022, at 11:33 AM, Ben Stuyts <ben at stuyts.nl> wrote:
>
> Oh bummer. Let me know if you want me to actually measure it.
>
> Ben
>
>
>
> On 30 Jun 2022, at 18:00, Didier Leplae <didierleplae at yahoo.com> wrote:
>
> 
>
> Interesting because the pinout shown on your power supply is different
> than indicated in the schematic in the manual on fdiskc. There pin 1 is
> connected to power and pin 2&3 are connected to ground. I wonder if that
> means there were different versions?
>
>
>
> On Jun 30, 2022, at 10:43 AM, Ben Stuyts <ben at stuyts.nl> wrote:
>
> Here’s a photo of mine. Funny, the MIDI warning on the label.
>
>
>
> The connector on my Etherwave is a 5-pin connector, so the power plug can
> be either 3-pin or 5-pin.
>
>
>
> Ben
>
>
>
> <PSU_Etherwave.jpeg>
>
>
>
> On 29 Jun 2022, at 22:46, Didier Leplae via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
>
>
> I have an opportunity to buy a Big Briar Etherwave Theremin from a friend
> for cheap. The only problem is it is missing the power supply.
>
> Searching online, I find a lot of Moog Etherwave power supplies.
>
> Does anyone happen to know if these are compatible?
>
> The power plug on the Big Briar unit is a 5-pin midi style plug.
>
> Pictures of the Moog power supply look like 3 pins.
>
>
> https://www.bigcitymusic.com/products/power-supply-115v-us-for-etherwave-theremin
>
>
>
> I’m wondering if they just simply removed two pins and the three fit in
> the midi style plug.
>
> If not compatible, does anyone know where to get a hold of the Big Briar
> supply?
>
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