[sdiy] Signals leaking into the PSU?

[Mike Bryant]

> But as a circuit designer I am not sure how much I'd rely on the 5V from the busboard, especially for things like ADC and DAC references.

No that's an analogue function and should be derived from the analogue supplies and referenced to the analogue grounds.  ADCs and DACs have well defined analogue and digital grounds which the IC can survive being quite significantly apart.


________________________________
From: David Huss <dh at atoav.com>
Sent: 22 February 2023 20:58
To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>; Mike Bryant <mbryant at futurehorizons.com>; synth-diy at synth-diy.org <synth-diy at synth-diy.org>; Ben Bradley <ben.pi.bradley at gmail.com>
Subject: Re: [sdiy] Signals leaking into the PSU?

The existing IDC connector would have the potential to use different grounds, so this would be a matter of agreeing on a standard and creating a busboard.

But as a circuit designer I am not sure how much I'd rely on the 5V from the busboard, especially for things like ADC and DAC references.

On February 22, 2023 8:41:08 PM UTC, Mike Bryant <mbryant at futurehorizons.com> wrote:
>> Eurorack has a 5V supply for such things, but there's
>> still a common ground (a non-zero resistance back to the power supply,
>>and in common with the other power sources) that can get polluted by
>>varying currents.
>
>I'm not a Eurorack person, but I would have expected separate digital and analogue grounds back to the PSU.  If not available, couldn't somebody add it as an option ?
>
>
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