[sdiy] Electrosmith Eurorack DSP platform

Eric Brombaugh ebrombaugh at gmail.com
Sat Jan 29 17:27:45 CET 2022

That All-Electric link points to a digital delay that uses a 1-bit CMOS 
implementation of a sigma-delta ADC & DAC. That's a direct follow-up to 
the comment Mike Bryant made about his colleagues building such a 
circuit, and related to the PDM techniques I've done in FPGAs which we 
were discussing.


On 1/29/22 04:47, cheater cheater wrote:
> Cool link Eric. Is there something on that page related to what we're
> talking about? Not meant sarcastically, it's just a bit of a mess ...
> I think I recognize it from years ago but not sure :)
> On Sat, Jan 29, 2022 at 12:49 AM Eric Brombaugh via Synth-diy
> <synth-diy at synth-diy.org> wrote:
>> Probably a good time to repost this link:
>> http://all-electric.com/b&c.html
>> Quirky, old chips, but there's a lot to learn from here.
>> Eric
>> On 1/28/22 14:25, Mike Bryant wrote:
>>> Yes.  But if you put the sampler and comparator well away from the FPGA to avoid the noise, and smoothed the feedback well, you could get similar performance.
>>> When sigma-delta was first proposed someone at the place I worked built a demonstrator using 4000 series CMOS.  But it got killed by someone touching it without a wristband :-)
>>> -----Original Message-----
>>> From: cheater cheater [mailto:cheater00social at gmail.com]
>>> Sent: 28 January 2022 20:23
>>> To: Mike Bryant
>>> Cc: Eric Brombaugh; synth-diy at synth-diy.org
>>> Subject: Re: [sdiy] Electrosmith Eurorack DSP platform
>>> Right, but they didn't do that on a run of the mill fpga, right? They designed their own custom IC where everything was on one chip of silicon - the digital output, the integrator circuit, etc - do I have that right?
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