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Agreed. I've got PCBs with a RaspberryPi CM4 running at 1.8GHz, a couple of other processors running at 200MHz, switchmode regulators, USB and MIDI connectors, then a PCM5102 DAC and balanced analogue output stages and all the various sockets (some on the
backside) all on a PCB 100mm * 100mm. It's how you do the grounding that matters, very little else. </div>
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In fact the prototype used 2 layers as well, but now 4 layers are so cheap at JLCPCB just go straight to that - makes life so much easier :-)<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Mattias Rickardsson <mr@analogue.org><br>
<b>Sent:</b> 03 February 2024 13:18<br>
<b>To:</b> cheater cheater <cheater00social@gmail.com><br>
<b>Cc:</b> Synth DIY <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] How to design out "usb noise"?</font>
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<div dir="ltr" class="x_gmail_attr">Den lör 3 feb. 2024 12:32cheater cheater <<a href="mailto:cheater00social@gmail.com">cheater00social@gmail.com</a>> skrev:<br>
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it makes sense to put the digital stuff on a separate pcb that's at<br>
least 1cm away from the analog stuff. (or at least, strip off a huge<br>
chunk of copper between them). This to prevent capacitive coupling.<br>
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<div dir="auto">It's the grounds that need to be galvanically isolated. Signals disturbing signals are not the issue here afaik.</div>
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<div dir="auto">/mr</div>
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