[sdiy] AS3394E: Practical power supply?

[Paul Perry]

There's always the LM337 negative adjustable three terminal regulator.

paulperry Melbourne Australia

------ Original Message ------
From: "Mike Bryant" <mbryant at futurehorizons.com>
To: "chris" <chris at chrismusic.de>; "synth-diy at synth-diy.org" 
<synth-diy at synth-diy.org>
Sent: 19/11/2021 5:07:49 AM
Subject: Re: [sdiy] AS3394E: Practical power supply?

>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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