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Well what I would do, and I bet a some people will object, will be to get rid of D1 and C3, then replace IC1 with a pin-compatible switching 7805 so that it doesn't get red hot,</div>
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Then tie the input of the switching 7805 to the 7815 in at C5.</div>
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Then depending on the current requirement of the Beatric interface, wire either a linear or switching 9V regulator also to the 7815 at C5.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Todd Sines <sines_list@scale.la><br>
<b>Sent:</b> 06 February 2024 21:25<br>
<b>To:</b> Mike Bryant <mbryant@futurehorizons.com><br>
<b>Cc:</b> analogue heaven <analogue@hyperreal.org>; synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] another year, another day, another transformer request</font>
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<div style="line-break:after-white-space">Maybe I should back up and list my full needs:
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<div>I want to power both the CMU800R and 5-10x System 100M modules.. *AND* the Beatnic.jp interface (9V) from one supply.</div>
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<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>
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<div>And recommended this toroidal transformer at Mouser</div>
<div>TRIAD VPT30-1670 <br>
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<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>
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<div>Am I missing something?</div>
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<div>Todd</div>
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<div>On Feb 6, 2024, at 2:51 PM, Mike Bryant <mbryant@futurehorizons.com> wrote:</div>
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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>
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<font face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b><span class="x_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="x_Apple-converted-space"> </span>06 February 2024 19:27<br>
<b>To:</b><span class="x_Apple-converted-space"> </span>AH <analogue@hyperreal.org>; synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b><span class="x_Apple-converted-space"> </span>[sdiy] another year, another day, another transformer request</font>
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<div style="box-sizing:border-box">It's official, my 117/120V transformer has sh!t the bed in my 120V CMU-800R. </div>
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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_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>
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<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="x_Apple-converted-space"> </span><span id="x_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>
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<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>
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<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_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">
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Specifically, <br style="box-sizing:border-box">
<a href="https://www.hammfg.com/part/1182Q9" target="_blank" id="x_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">
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Are there by chance some cheaper, faster, or even Amazon equivalents?</div>
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<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">
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Todd</div>
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