[sdiy] Help with Jupiter 8 clone

[Mr&MrsAccount]

The trouble arises when you add a new module to an existing system.  Suddenly something else does not work and it's the "new guys" fault... even if the real root cause is that 
the old module was improperly designed.  Now a manufacturer gets all these complaints, bad reviews, warranty returns... 
  
The Zener shunt regulator has its place. It can be a power-hungry pig (suppose you feed +/-15 to a module designed for +/-12).  But it is robust and reliable. 
  
The 78xx regulator is another story. Maybe the module manufacturer should have designed in voltage references instead of trying to clean up a customer's noisy supply. 
  
I had a lot of trouble with some Aries modules back in the day that had noise issues which I traced to the "metal shells" on the trimpots.  Only years later did I find out the 
real culprit was the crappy linear power supply I designed that let the noise be present in the first place.  Adding capacitive decoupling to those trimpots fixed it... but the root cause was 
my high-ripple power supply... and Aries' choice to source critical bias points from the power supply rails. 
  
Voltage references, anyone?  
  
The modular is a system and the user has to be a system integrator and deal with everyone else's bad design choices. 
  
Hey. Let's all design a universally robust power interface system that meets all designer's needs and price points.  ROTFLMFAO! 
  
Harry 
  
   

-----Original Message-----

From: Barry <synth-diy at synth-diy.org>
To: Mike <mbryant at futurehorizons.com>
Cc: synth-diy <synth-diy at synth-diy.org>
Date: Thursday, 4 August 2022 2:03 PM EDT
Subject: Re: [sdiy] Help with Jupiter 8 clone

When this topic comes up I always think of the design of a hard disk and how well they work given some of the cheap pc supplies out there. There must be experiences some of you have where you first had issues with an SMPS but resolved them by using different magnetics, shielding, ferrites, higher frequency SMPS, or?



> On Aug 4, 2022, at 9:17 AM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 
> 
> 
> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Gordonjcp
> Sent: 04 August 2022 15:14
> To: synth-diy at synth-diy.org
> Subject: Re: [sdiy] Help with Jupiter 8 clone
> 
>> On Wed, Aug 03, 2022 at 08:00:14PM -0400, Josh Nursing via Synth-diy wrote:
>> 
>>> Yes, a lot of machines use SMPSes. They really are a disservice to 
>>> audio quality, they will mess up your audio chain, as sure as a 
>>> ballast-lamp or a dimmer will do if it is anywhere in the same power 
>>> distribution, as sure as
> 
>> Bullshit.
> 
>> Gordonjcp
> 
> 
> Yeah - he also said
> "I have a sneaking suspicion the handful of people looking for citations or sources have never even measured a thing themselves - high chance they wouldn't even know how to measure nor what to look for"
> 
> Anybody measuring pro-audio performance does so with an Audio Precision analyser - which guess what, apart from the old System 1, has an SMPS. Nothing else comes close to an AP, but the ones that attempt to such as the QuantAsylum also have an SMPS. 
> 
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