<div dir="ltr"><div>Electric Druid has code and circuits for noise generators on 8 pin microcontrollers, which I'm sure are adaptable into other platforms.</div><div><br></div><div><a href="https://electricdruid.net/white-noise-source-mm5837-mm5437-replacement/">https://electricdruid.net/white-noise-source-mm5837-mm5437-replacement/</a></div><div><a href="https://electricdruid.net/noise2-white-pink-noise-source/">https://electricdruid.net/noise2-white-pink-noise-source/</a></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sun, 14 Dec 2025 at 12:02, Jay Schwichtenberg via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Looking at the EDN schematic again I think there is an error. Think C1 <br>
should go from Q1's emitter and ground, not emitter and +12. I built <br>
mine with C1 going to ground.<br>
<br>
Jay S.<br>
<br>
On 12/13/2025 1:05 PM, Mike Beauchamp wrote:<br>
> On 2025-12-13 09:35, Brother Theo via Synth-diy wrote:<br>
>> I switched to the 2 transistor noise circuit and have had zero issues <br>
>> since. The Future Retro 777 re-release uses that circuit.<br>
><br>
> Hi Timothy, doing some duckduckgo-ing, I found a few...<br>
><br>
> <a href="https://www.edn.com/simple-white-noise-generator/" rel="noreferrer" target="_blank">https://www.edn.com/simple-white-noise-generator/</a><br>
><br>
> <a href="https://www.nutsvolts.com/magazine/article/bipolar_transistor_cookbook_part_5" rel="noreferrer" target="_blank">https://www.nutsvolts.com/magazine/article/bipolar_transistor_cookbook_part_5</a> <br>
> (figure 20)<br>
><br>
><br>
> The EDN article is interesting. Seems like the second transistor is <br>
> just the amplification stage and the increased noise level is because <br>
> of the addition of C1. I don't understand the function of C1.. time to <br>
> get out the breadboard.<br>
><br>
> Mike<br>
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</blockquote></div>