<div dir="ltr"><div>SMPS are the most polluting/noisy PSUs for audio purposes. Lots of high-frequency current spikes affect both downstream circuits and the mains they're connected to.</div><div><br></div><div>And before you start telling me about filtering the output of them, that does absolutely nothing for the mains-side noise.</div><div><br></div><div>Effects on audio are across the board - all audio frequencies suffer, and it's probably more noticeable in loss of bass frequencies.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Aug 2, 2022 at 11:41 AM Mike Bryant <<a href="mailto:mbryant@futurehorizons.com">mbryant@futurehorizons.com</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">
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<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)">How can audio suffer from putting a PSU in with 100 times better performance ? No 50/100Hz at all and general noise almost zero. And it’s far less heat
so everything else runs cooler and better. I think too many people see the noise from their phone charger or whatever and assume a proper SMPS is like that.<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10pt;font-family:"Tahoma","sans-serif"" lang="EN-US">From:</span></b><span style="font-size:10pt;font-family:"Tahoma","sans-serif"" lang="EN-US"> Synth-diy [mailto:<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank">synth-diy-bounces@synth-diy.org</a>]
<b>On Behalf Of </b>Josh Nursing via Synth-diy<br>
<b>Sent:</b> 02 August 2022 16:35<br>
<b>To:</b> Synth DIY<br>
<b>Subject:</b> Re: [sdiy] Help with Jupiter 8 clone<u></u><u></u></span></p>
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<p class="MsoNormal">I really don't like the idea of replacing the linear PSU in those vintage synths with a SMPS one. Audio suffers.<u></u><u></u></p>
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<p class="MsoNormal">On Tue, Aug 2, 2022 at 7:45 AM Adam (synthDIY) <<a href="mailto:synthdiy@adambaby.com" target="_blank">synthdiy@adambaby.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Luís, I assume you’re aware of this<u></u><u></u></p>
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<p class="MsoNormal"><a href="https://synthronics.de/roland-jupiter-8-new-psu/" target="_blank">https://synthronics.de/roland-jupiter-8-new-psu/</a><u></u><u></u></p>
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<p class="MsoNormal">and this guy, who has been ominously quiet of late<u></u><u></u></p>
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<p class="MsoNormal"><a href="https://jup8restoration.wordpress.com/2019/10/22/new-power-supply-being-manufactured-for-a-jupiter-8/" target="_blank">https://jup8restoration.wordpress.com/2019/10/22/new-power-supply-being-manufactured-for-a-jupiter-8/</a><u></u><u></u></p>
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<p class="MsoNormal">A<u></u><u></u></p>
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<p class="MsoNormal">On 2 Aug 2022, at 3:57 am, Luís Marka via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Hi guys,<br>
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I am giving a serious thought about building a Jupiter 8 clone, and started to take a deeper look at the schematics (actually I already ordered some of the parts, so it looks like I will get it done eventually). In the PSU there are three GP-30G diodes tied
at the -15, +15 and +5V outputs, listed as "Hi-Fi Special" both in the schematics and in the parts list. I never heard anything about a "hi-fi special" diode, any idea what that means??<br>
<br>
Cheers!<br>
<br>
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