<div dir="auto">Maybe it's possible to find some of those interference problems if you combine an old or unrefined SMPS design with the old original unshielded JP-8 PCB layout, but as a general "truth" it sounds quite false. :-)<div dir="auto"><br></div><div dir="auto">/mr</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Den tis 2 aug. 2022 18:23Tom Wiltshire <<a href="mailto:tom@electricdruid.net">tom@electricdruid.net</a>> skrev:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space">+1 agree with Rob, evidence is definitely required for for such a bold claim.<br>
<div><br><blockquote type="cite"><div>On 2 Aug 2022, at 16:51, rob hukin <<a href="mailto:rob@audiocircus.co.uk" target="_blank" rel="noreferrer">rob@audiocircus.co.uk</a>> wrote:</div><br><div><div style="word-wrap:break-word;line-break:after-white-space">*citation required<div><br></div><div>rob.<br><div><br><blockquote type="cite"><div>On 2 Aug 2022, at 16:46, Josh Nursing via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank" rel="noreferrer">synth-diy@synth-diy.org</a>> wrote:</div><br><div><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" target="_blank" rel="noreferrer">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">
<div lang="EN-GB">
<div><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><p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)"><u></u> <u></u></span></p><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" rel="noreferrer">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><p class="MsoNormal"><u></u> <u></u></p>
<div><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>
</div><p class="MsoNormal"><u></u> <u></u></p>
<div>
<div><p class="MsoNormal">On Tue, Aug 2, 2022 at 7:45 AM Adam (synthDIY) <<a href="mailto:synthdiy@adambaby.com" target="_blank" rel="noreferrer">synthdiy@adambaby.com</a>> wrote:<u></u><u></u></p>
</div>
<blockquote style="border-color:currentcolor currentcolor currentcolor rgb(204,204,204);border-style:none none none solid;border-width:medium medium medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div><p class="MsoNormal">Luís, I assume you’re aware of this<u></u><u></u></p>
<div><p class="MsoNormal"><u></u> <u></u></p>
</div>
<div><p class="MsoNormal"><a href="https://synthronics.de/roland-jupiter-8-new-psu/" target="_blank" rel="noreferrer">https://synthronics.de/roland-jupiter-8-new-psu/</a><u></u><u></u></p>
</div>
<div><p class="MsoNormal"><u></u> <u></u></p>
</div>
<div><p class="MsoNormal">and this guy, who has been ominously quiet of late<u></u><u></u></p>
</div>
<div><p class="MsoNormal"><u></u> <u></u></p>
</div>
<div><p class="MsoNormal"><a href="https://jup8restoration.wordpress.com/2019/10/22/new-power-supply-being-manufactured-for-a-jupiter-8/" target="_blank" rel="noreferrer">https://jup8restoration.wordpress.com/2019/10/22/new-power-supply-being-manufactured-for-a-jupiter-8/</a><u></u><u></u></p>
</div>
<div><p class="MsoNormal"><u></u> <u></u></p>
</div>
<div><p class="MsoNormal"><u></u> <u></u></p>
</div>
<div><p class="MsoNormal"><u></u> <u></u></p>
</div>
<div><p class="MsoNormal"><u></u> <u></u></p>
</div>
<div><p class="MsoNormal">A<u></u><u></u></p>
<div><p class="MsoNormal"><br>
<br>
<u></u><u></u></p>
<div><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" rel="noreferrer">synth-diy@synth-diy.org</a>> wrote:<u></u><u></u></p>
</div><p class="MsoNormal"><u></u> <u></u></p>
<div>
<div><p class="MsoNormal">Hi guys,<br>
<br>
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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<span style="border-collapse:separate;font-family:Helvetica;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-east-asian:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word;line-break:after-white-space"><span style="border-collapse:separate;border-spacing:0px;font-family:Helvetica;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-east-asian:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div style="word-wrap:break-word;line-break:after-white-space"><div style="margin:0px">Rob Hukin</div><div style="margin:0px">Audiocircus Ltd</div><div style="margin:0px">6 Blackstone St</div><div style="margin:0px">Blackstone</div><div style="margin:0px">Henfield</div><div style="margin:0px">BN5 9TH</div><div style="margin:0px">UK</div><div style="margin:0px;min-height:14px"><br></div><div style="margin:0px">+44 7961 883 949</div><div style="margin:0px"><br></div></div><br></span></div></span><br><br>
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