[sdiy] AS3394E: Practical power supply?

[Ben Stuyts]

Hi Mike,

What kind of ripple/noise figures do you get with the TPS65131?

Ben


> On 18 Nov 2021, at 16:52, 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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