<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><br class="">
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<div><br class=""><blockquote type="cite" class=""><div class="">On 31 Oct 2019, at 00:54, Adam Inglis <<a href="mailto:21pointy@tpg.com.au" class="">21pointy@tpg.com.au</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On 31 Oct 2019, at 10:28 AM, Neil Harper <<a href="mailto:metadata@gmx.com" class="">metadata@gmx.com</a>> wrote:</div><div class=""><div class=""><br class="">as some others have said, i'm reading a lot of people saying that a<br class="">linear regulator after an smps doesn't do much to clean up the high<br class="">frequency ripple of the smps - which makes sense, that's not what the<br class="">linear regulators were designed for. so i'm very curious how commercial<br class="">designs like the rackbrute are adequately filtering this stuff…<br class=""><br class=""></div></div></blockquote><br class=""></div><div class=""><br class=""></div><div class="">I’m interested in these answers too.</div><div class="">This guy is making a replacement PSU for the Jupiter 8 that has got me tempted…</div><div class=""><br class=""></div><div class=""><a href="https://synthronics.de/roland-jupiter-8-new-psu/" class="">https://synthronics.de/roland-jupiter-8-new-psu/</a></div><div class=""><br class=""></div><div class="">You can see the block schematic down the page. There is a LDO linear regulator after the negative 15 v supply, but not the positive 15 or the 5 v supply. He claims “no audible noise”.</div><div class=""><br class=""></div><div class="">This would reduce the heat from the old jupe enormously, however, I’m wondering what might be the downside… noise being one, but also, how long do these things last, compared to nearly 40 years for the original supply, and how easy are they to troubleshoot and repair ?? etc</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Adam</div></div></div></blockquote><br class=""></div><div><br class=""></div><div>I read “No audible noise” as “You can’t hear the power supply humming” rather than “it produces clean noiseless power”. I might be wrong.</div><div><br class=""></div><div>Tom</div></body></html>