<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Maybe I should back up and list my full needs:<div><br></div><div>I want to power both the CMU800R and 5-10x System 100M modules.. *AND* the Beatnic.jp interface (9V) from one supply.</div><div><br></div><div>E-Licktronic tackled the M-191 Supply here</div><div><a href="http://www.e-licktronic.com/home/4-m-191-x.html">http://www.e-licktronic.com/home/4-m-191-x.html</a><br></div><div><br></div><div></div><div>And recommended this toroidal transformer at Mouser</div><div>TRIAD VPT30-1670 <br><div><br></div><div>This densely layered schematic shows at the bottom left the +/-15V and +5V from the transformer; the toroidal above could drive the +/-15V from the taps, then use the 7805 to get my +5 for the CPU portion of the CMU.</div><div><a href="https://www.synthxl.com/wp-content/uploads/2020/01/Roland-CMU-800-Compu-Music-Schematic.pdf">https://www.synthxl.com/wp-content/uploads/2020/01/Roland-CMU-800-Compu-Music-Schematic.pdf</a></div><div><br></div><div>Am I missing something?</div><div><br></div><div><br></div><div>Todd</div><div><br></div><div><blockquote type="cite"><div>On Feb 6, 2024, at 2:51 PM, Mike Bryant <mbryant@futurehorizons.com> wrote:</div><br class="Apple-interchange-newline"><div><meta charset="UTF-8"><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">First thought is do the 17V and 9V need to be isolated from each other ? You might be able to use a 9-0-9V transformer to get the 17V (as 18V) and a large capacitor(s) to level shift the 0V line and one of the 9Vs to create 9v.<br></div><div id="appendonsend" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"></div><hr tabindex="-1" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline-block; width: 983.90625px;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;"></span><div id="divRplyFwdMsg" dir="ltr" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><font face="Calibri, sans-serif" style="font-size: 11pt;"><b>From:</b><span class="Apple-converted-space"> </span>Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Todd Sines via Synth-diy <synth-diy@synth-diy.org><br><b>Sent:</b><span class="Apple-converted-space"> </span>06 February 2024 19:27<br><b>To:</b><span class="Apple-converted-space"> </span>AH <analogue@hyperreal.org>; synth-diy@synth-diy.org <synth-diy@synth-diy.org><br><b>Subject:</b><span class="Apple-converted-space"> </span>[sdiy] another year, another day, another transformer request</font><div> </div></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="box-sizing: border-box;">It's official, my 117/120V transformer has sh!t the bed in my 120V CMU-800R. </div><div style="box-sizing: border-box;"><br style="box-sizing: border-box;">Last post was from last year, also on SDIY<br style="box-sizing: border-box;"><a href="https://synth-diy.org/pipermail/synth-diy/2023-February/131184.html" target="_blank" id="x_isPasted" rel="noopener noreferrer" style="box-sizing: border-box; color: rgb(76, 140, 246); text-decoration: none; background: none; outline: currentcolor;">https://synth-diy.org/pipermail/synth-diy/2023-February/131184.html</a></div><div style="box-sizing: border-box;"><br style="box-sizing: border-box;"></div><div style="box-sizing: border-box;">No doubt, I *would* like to buy a few toroidal transformers from Florian, but then I'll want the VCM, module and the SQ-3P module, and it will rise up to several hundred<span class="Apple-converted-space"> </span><span id="x_isPasted" style="color: rgb(84, 84, 84); font-family: Helvetica, "Nimbus Sans L", Arial, "Liberation Sans", sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-style: initial; text-decoration-color: initial; float: none; box-sizing: border-box; display: inline !important;">€ </span>before I'm done.</div><div style="box-sizing: border-box;"><br style="box-sizing: border-box;"></div><div style="box-sizing: border-box;">In the meantime, I'm looking for a dual tap transformer -- AC120V in, 17V and 9V out. I don't see any of these on Syntaur, Sam. </div><div style="box-sizing: border-box;"><br style="box-sizing: border-box;"></div><div style="box-sizing: border-box;">Leaning towards this Hammond toroidal transformer:<br style="box-sizing: border-box;"><a target="_blank" rel="noopener noreferrer" href="https://www.hammfg.com/electronics/transformers/power/1182" id="x_isPasted" style="box-sizing: border-box; color: rgb(76, 140, 246); text-decoration: none; background: none; outline: currentcolor;">https://www.hammfg.com/electronics/transformers/power/1182</a><br style="box-sizing: border-box;"><br style="box-sizing: border-box;">Specifically, <br style="box-sizing: border-box;"><a href="https://www.hammfg.com/part/1182Q9" target="_blank" id="x_isPasted" rel="noopener noreferrer" style="box-sizing: border-box; color: rgb(76, 140, 246); text-decoration: none; background: none; outline: currentcolor;">https://www.hammfg.com/part/1182Q9</a><br style="box-sizing: border-box;"><br style="box-sizing: border-box;">Are there by chance some cheaper, faster, or even Amazon equivalents?</div><div style="box-sizing: border-box;"><br style="box-sizing: border-box;"></div><div style="box-sizing: border-box;">PS. The reason for the CMU: With a Beatnic.jp CMU800-MIDI converter, it can also function as a MIDI/DIN Sync converter, plus 8-channel MIDI-CV converter, a pile of chip-tune style square wave oscs, a low-rent 606 drum module, and I've tapped the supplies to drive my System 100M off it to boot. And I have two -- 1 220V, 1 120V.<br style="box-sizing: border-box;"><br style="box-sizing: border-box;">Todd</div></div></div></blockquote></div><br></div></body></html>