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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Yes I use the those TI products a lot for low-noise mic amplifiers.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The only time you really need multi-phase and zero-crossing is when you are dealing with kW levels – either as power amps or as solar panel controllers which
are two of our specialities. Solar controllers tend to be more specialised so you usually use a DSP orientated MCU to do the timing. Google for solar power zero-crossing and lots of paper should appear.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> DIY DSP [mailto:diydsp@yahoo.com]
<br>
<b>Sent:</b> 03 August 2022 19:26<br>
<b>To:</b> Josh Nursing; Mike Bryant<br>
<b>Cc:</b> synth-diy@synth-diy.org<br>
<b>Subject:</b> Re: [sdiy] Help with Jupiter 8 clone<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">></span><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D">A good one using multi-phase zero-crossing switching will show none of that.</span><span style="font-family:"Helvetica","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">I hadn't heard of multi-phase switchers before, so I googled it and found htis nice doc I figured might interest people:<o:p></o:p></span></p>
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<p class="MsoNormal"><a href="https://www.ti.com/lit/an/slva882b/slva882b.pdf" target="_blank"><span style="font-family:"Helvetica","sans-serif"">https://www.ti.com/lit/an/slva882b/slva882b.pdf</span></a><span style="font-family:"Helvetica","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">the only problem is that it doesn't reference the zero-crossing part... I'm having less luck finding that... have you got any good references for that?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">thank you!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">Noah Vawter's futuristic electronic music instrument lab:
</span><a href="https://youtube.com/diydsp" target="_blank"><span style="font-family:"Helvetica","sans-serif"">youtube.com/diydsp</span></a><span style="font-family:"Helvetica","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">On Tuesday, August 2, 2022 at 12:05:07 PM EDT, Mike Bryant <</span><a href="mailto:mbryant@futurehorizons.com"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">mbryant@futurehorizons.com</span></a><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">>
wrote: <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p> </o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D">I’ve been using SMPS in pro-audio equipment we design since the 1970s, as have most of the other top audio designers I know. Some took until
the late 90s to come round but from then on everybody who mattered accepted SMPS were better.
</span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D"> </span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D">High frequency current spikes indicate a badly designed SMPS, nothing more. A good one using multi-phase zero-crossing switching will show none
of that.</span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D"> </span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D">Have a look inside every pro-audio product nowadays and you’ll find a SMPS. And to be sold they have to pass mains radiated tests so there is
very little mains-side noise. Indeed it is linear supplies which often used to fail those tests as they distorted the mains signal more due to core hysteresis.</span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D"> </span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D">So I will submit that you have a somewhat jaundiced view.</span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D"> </span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D"> </span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> Synth-diy [mailto:synth-diy-bounces@synth-diy.org]
<b>On Behalf Of </b>Josh Nursing via Synth-diy<br>
<b>Sent:</b> 02 August 2022 16:47<br>
<b>To:</b> synth-diy@synth-diy.org<br>
<b>Subject:</b> Re: [sdiy] Help with Jupiter 8 clone</span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">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.<o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">And before you start telling me about filtering the output of them, that does absolutely nothing for the mains-side noise.<o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">Effects on audio are across the board - all audio frequencies suffer, and it's probably more noticeable in loss of bass frequencies.<o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">On Tue, Aug 2, 2022 at 11:41 AM Mike Bryant <</span><a href="mailto:mbryant@futurehorizons.com" target="_blank"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">mbryant@futurehorizons.com</span></a><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">>
wrote:<o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D">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.</span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D"> </span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:11.0pt;font-family:"Helvetica","sans-serif";color:#1F497D"> </span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> Synth-diy [mailto:</span><a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">synth-diy-bounces@synth-diy.org</span></a><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">]
<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</span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">I really don't like the idea of replacing the linear PSU in those vintage synths with a SMPS one. Audio suffers.<o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">On Tue, Aug 2, 2022 at 7:45 AM Adam (synthDIY) <</span><a href="mailto:synthdiy@adambaby.com" target="_blank"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">synthdiy@adambaby.com</span></a><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">>
wrote:<o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">Luís, I assume you’re aware of this<o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><a href="https://synthronics.de/roland-jupiter-8-new-psu/" target="_blank"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">https://synthronics.de/roland-jupiter-8-new-psu/</span></a><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">and this guy, who has been ominously quiet of late<o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><a href="https://jup8restoration.wordpress.com/2019/10/22/new-power-supply-being-manufactured-for-a-jupiter-8/" target="_blank"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">https://jup8restoration.wordpress.com/2019/10/22/new-power-supply-being-manufactured-for-a-jupiter-8/</span></a><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">A<o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">On 2 Aug 2022, at 3:57 am, Luís Marka via Synth-diy <</span><a href="mailto:synth-diy@synth-diy.org" target="_blank"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">synth-diy@synth-diy.org</span></a><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">>
wrote:<o:p></o:p></span></p>
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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">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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<p class="yiv4658734117msonormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"> <o:p></o:p></span></p>
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