<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
{mso-style-priority:99;
mso-style-link:"Texte brut Car";
margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-ligatures:standardcontextual;
mso-fareast-language:EN-US;}
span.TextebrutCar
{mso-style-name:"Texte brut Car";
mso-style-priority:99;
mso-style-link:"Texte brut";
font-family:"Calibri",sans-serif;
mso-ligatures:standardcontextual;
mso-fareast-language:EN-US;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
mso-ligatures:none;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=FR-CA link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><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 width=707 height=476 style='width:7.3645in;height:4.9583in' id="Image_x0020_1" src="cid:image003.jpg@01DAC572.C9EEB960"></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></div></body></html>