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<p>They're called "common mode" chokes. There are many ready made
ones out there for SMPS filtering from various sources.</p>
<p>You may want to try some with your SMPS's and see you get good
results.</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 6/23/24 12:40 PM, Jean-Pierre
Desrochers via Synth-diy wrote:<br>
</div>
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<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Is there anybody who made some
researches on the type of inductors<o:p></o:p></p>
<p class="MsoPlainText">used in the new Roland 9VDC switching
supplies ?<o:p></o:p></p>
<p class="MsoPlainText">The actual filtering circuit placed in
series with the walwart supply block output is shown here<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span style="mso-ligatures:none"><img
style="width:7.3645in;height:4.9583in" id="Image_x0020_1"
src="cid:part1.zdyjRxDY.u0m2IIMW@ix.netcom.com" class=""
width="707" height="476"></span><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Inductor L1 and the toroid T1 are of
unknown values.<o:p></o:p></p>
<p class="MsoPlainText">I can measure them with my meters but
they are mounted<o:p></o:p></p>
<p class="MsoPlainText">On solid ferrite cores. So making them
more difficult to reproduce..<o:p></o:p></p>
<p class="MsoPlainText">I ask because I already have a bunch of
surplus 9vdc@1A SMPS blocks<o:p></o:p></p>
<p class="MsoPlainText">acquired in the past and would like to
use them to supply<o:p></o:p></p>
<p class="MsoPlainText">some of my guitar pedals..<o:p></o:p></p>
<p class="MsoPlainText">Using them with their ‘raw’ unfiltered
9vdc output makes an annoying<o:p></o:p></p>
<p class="MsoPlainText">background noise in the audio signal
path..<o:p></o:p></p>
<p class="MsoPlainText">The ‘possible’ values of these 2
components, or a similar schematic<o:p></o:p></p>
<p class="MsoPlainText">That would do the same job would be
appreciated.<o:p></o:p></p>
<p class="MsoPlainText">Thanks.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
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<br>
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