[sdiy] AS3394E: Practical power supply?

[Mike Bryant]

Yes this is far more likely.  Digital devices and displays should of course have their own switcher.

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of chris
Sent: 18 November 2021 18:04
To: synth-diy at synth-diy.org
Subject: Re: [sdiy] AS3394E: Practical power supply?

I think the word of caution is not against smps in general, but w.r.t. a filthy +5V going to a micro controller, including all current/voltage spikes coming from digital operation. 
Before you know it, you may hear something like a software LED refresh rate on the supply line.

Chris



On Thu, 18 Nov 2021 15:52:51 +0000 Mike Bryant <mbryant at futurehorizons.com> wrote:

> Uh ?   A decent SMPS has far less noise on the output than most linear supplies, and all well out of audio band.
> 
> 
> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of 
> Ben Stuyts
> Sent: 18 November 2021 15:11
> To: Benjamin Tremblay
> Cc: SYNTH DIY
> Subject: Re: [sdiy] AS3394E: Practical power supply?
> 
> Hi Ben,
> 
> A quick glance of the datasheet warns about jitter and stability affected by both the pos and neg rails. So I would def. not use any smps for this. A pair of LM317 / LM337 would do fine of course.
> 
> (Other) Ben
> 
> 
> > On 18 Nov 2021, at 15:09, Benjamin Tremblay via Synth-diy <synth-diy at synth-diy.org> wrote:
> > 
> > Greetings,
> > 
> > I have been intrigued by the CEM3394 for a long time. I realize it’s the part of the Sequential Six Trak I like; the rest of the Six Trak leaves a lot to be desired.
> > 
> > What is a straightforward way to obtain the -6.5V negative supply? Use a 9V regulator and drop it with diodes? Use an adjustable switching supply? Add a feedback loop to a regulator? I’m assuming even a gaggle of 3394 chips won’t consume much current on the negative side.
> > 
> > I’m lazy (working 2 jobs and taking care of 2 kids and a puppy) and I won’t get much done unless I can breadboard the chip and try out some s/h ideas.
> > 
> > Thanks,
> > Ben
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> 
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