<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<div>
<div dir="ltr">That’s embarrassing… first post and it’s an accident. Sorry!</div>
</div>
<div id="ms-outlook-mobile-signature">
<div><br>
</div>
<div dir="ltr"><span style="color:rgb(0, 0, 0);font-family:UICTFontTextStyleBody;font-size:19px">___________________________________________</span><span style="color:rgb(0, 0, 0);font-family:UICTFontTextStyleBody;font-size:19px;display:inline !important">Please
excuse the brevity and tpyos as it was sent from my smartphone. </span><br>
</div>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Shalom D Ruben <shalom@colorado.edu><br>
<b>Sent:</b> Wednesday, April 24, 2024 6:22:36 PM<br>
<b>To:</b> Chris McDowell <declareupdate@gmail.com>; Mike Bryant <mbryant@futurehorizons.com><br>
<b>Cc:</b> SDIY List <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] anti pop mosfets in minibrute</font>
<div> </div>
</div>
<div>
<div>
<div dir="ltr">
<div dir="ltr">Can we talk over the phone?</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Thanks,</div>
<div dir="ltr">Shalom </div>
</div>
</div>
<div id="x_ms-outlook-mobile-signature">
<div><br>
</div>
<div dir="ltr"><span style="color:rgb(0,0,0); font-family:UICTFontTextStyleBody; font-size:19px">___________________________________________</span><span style="color:rgb(0,0,0); font-family:UICTFontTextStyleBody; font-size:19px; display:inline!important">Please
excuse the brevity and tpyos as it was sent from my smartphone. </span><br>
</div>
</div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Chris McDowell via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> Wednesday, April 24, 2024 5:59:14 PM<br>
<b>To:</b> Mike Bryant <mbryant@futurehorizons.com><br>
<b>Cc:</b> SDIY List <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] anti pop mosfets in minibrute</font>
<div> </div>
</div>
<div>
<div dir="auto">
<div>[External email - use caution]</div>
<br>
<div>good point Mike. And even at 600, the clipping would be barely noticeable at full volume, thus sayeth the spice man
<div><br id="x_x_x_lineBreakAtBeginningOfSignature">
<div dir="ltr">Cheers,
<div>Chris </div>
</div>
<div dir="ltr"><br>
<blockquote type="cite">On Apr 24, 2024, at 6:48 PM, Mike Bryant <mbryant@futurehorizons.com> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<div class="x_x_x_elementToProof" style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
I think the designer assumed the use of consumer 32 Ohm headphones rather than the pro 600 Ohm ones. </div>
<div id="x_x_x_appendonsend"></div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Tom Wiltshire <tom@electricdruid.net><br>
<b>Sent:</b> 24 April 2024 23:24<br>
<b>To:</b> Chris McDowell <declareupdate@gmail.com><br>
<b>Cc:</b> SDIY List <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] anti pop mosfets in minibrute</font>
<div> </div>
</div>
<div class="" style="word-wrap:break-word; line-break:after-white-space">Isn't the problem when the output goes *over* the forward voltage of the diodes? Below that limit , they won't conduct, or barely, anyway. In which case, keep the voltage low, but drive
the current (it's a low impedance headphone output) and no problem. When the mosfets are on, the output is shorted to ground. When they're not, you're ok up to that (roughly) 2Vpp limit.
<div class=""><br class="">
</div>
<div class="">Am I just catching up on what you've already worked out? Wouldn't be the first time...;)</div>
<div class=""><br class="">
</div>
<div class="">Tom</div>
<div class=""> <br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 24 Apr 2024, at 21:14, Chris McDowell via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div>
<br class="x_x_x_x_Apple-interchange-newline">
<div class="">
<div dir="auto" class="">
<div class="">
<div class="" style="display:block">
<div class="x_x_x_x_apple-rich-link" role="link" style="display:inline-block"><a class="x_x_x_x_lp-rich-link" rel="nofollow" href="https://hackabrute.yusynth.net/MINIBRUTE/digital-board/schematics/MiniBrute-10-OUTPUT.pdf" originalsrc="https://hackabrute.yusynth.net/MINIBRUTE/digital-board/schematics/MiniBrute-10-OUTPUT.pdf" shash="v13UpfJhwMEHdfVhEAfVTXLbKGvl+P9Poz63YRvZhdM7lhDT70D106Ho4jNTqq3NnQgOrZ4rdbyL0Iz2X1QQ2+3f0/q3zEPOs7DT8+vw1xgzkRh+OUg9F706Q/ENq2KVOMzWmnJmFLXa/2k9aECxydgnqKgcUEROxk8PYbp7i74=" dir="ltr" role="button" width="300" style="border-radius:10px; display:block; width:300px; overflow:hidden; text-decoration:none">
<table class="x_x_x_x_lp-rich-link-emailBaseTable" cellpadding="0" cellspacing="0" border="0" width="300" style="table-layout:fixed; border-collapse:collapse; width:300px; background-color:#E9E9EB">
<tbody class="">
<tr class="">
<td align="center" class=""><span id="x_x_x_x_cid:A2192685-D4D4-4ACC-8747-FF1A61C44ECA"><preview.png></span></td>
</tr>
<tr class="">
<td class="">
<table bgcolor="#E9E9EB" cellpadding="0" cellspacing="0" width="300" class="x_x_x_x_lp-rich-link-captionBar" style="table-layout:fixed; background-color:rgba(233,233,235,1)">
<tbody class="">
<tr class="">
<td class="x_x_x_x_lp-rich-link-captionBar-textStackItem" style="padding:8px 0px 8px 0px">
<div class="x_x_x_x_lp-rich-link-captionBar-textStack" style="max-width:100%; margin:0px 16px 0px 16px; overflow:hidden">
<div class="x_x_x_x_lp-rich-link-captionBar-textStack-topCaption-leading" style="word-wrap:break-word; font-weight:500; font-size:12px; overflow:hidden; text-overflow:ellipsis; text-align:left">
<a rel="nofollow" href="https://hackabrute.yusynth.net/MINIBRUTE/digital-board/schematics/MiniBrute-10-OUTPUT.pdf" originalsrc="https://hackabrute.yusynth.net/MINIBRUTE/digital-board/schematics/MiniBrute-10-OUTPUT.pdf" shash="oUYt+P+fJeWZOORlIuBk/n5fSbNo3+4Q4ZjtUFvs0fNP8X7hAhGvHULGmqZKIQx1pXjKVJCvD2kxWkN3FRyMrqVI3zYYX31tLdqKC3WBI/iooKZ6nek4L/wEG1vZ3TqCE7Am+K7xHuIM4R4PoPBH4Kn+/MEIA2TE8peqdWvjAac=" class="" style="text-decoration:none"><font class="" style="">MiniBrute-10-OUTPUT</font></a></div>
<div class="x_x_x_x_lp-rich-link-captionBar-textStack-bottomCaption-leading" style="word-wrap:break-word; font-weight:400; font-size:11px; overflow:hidden; text-overflow:ellipsis; text-align:left">
<a rel="nofollow" href="https://hackabrute.yusynth.net/MINIBRUTE/digital-board/schematics/MiniBrute-10-OUTPUT.pdf" originalsrc="https://hackabrute.yusynth.net/MINIBRUTE/digital-board/schematics/MiniBrute-10-OUTPUT.pdf" shash="C6fAHsO/WOovlELfRHO7pLBMLNKVCBibZbr7iXEoPE857ZPYACaPZSJbj1sCcgtcDCHjFfnZDjAkbyGXNcDMUS7Giw83vxp/BUxE+ni7qCxH78kPsSVrve5iDNXRLVlvyinhoRSlCjKrE+OaOz21ozGz6yCS/0EVn9Ivd3p25/U=" class="" style="text-decoration:none"><font color="#A2A2A9" class="" style="color:rgba(60,60,67,0.6)">PDF
Document · 339 KB</font></a></div>
</div>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</a></div>
</div>
<br class="">
</div>
<div class=""><br class="">
</div>
<div class="">hello list, I've been looking at minibrute schematics today and I'm puzzled by the anti pop circuitry in the headphone driver. it -seems- like the body diode of the mosfets would conduct when the signal went below 0.6ish volts (something I've
run into this using mosfets for dc signal muting).</div>
<div class=""><br class="">
</div>
<div class=""> From the vca page, that signal can be up to 2Vpp. <a href="https://hackabrute.yusynth.net/MINIBRUTE/analog-board/schematics/MiniBrute-08-VCA.pdf" originalsrc="https://hackabrute.yusynth.net/MINIBRUTE/analog-board/schematics/MiniBrute-08-VCA.pdf" shash="cdQoaW0ZSW/lCPUyXouBVzZOFXB3Jq22kh0nWaS1w4oh0aW5i9r/4QE/VfQfpzeRV36FbK69MAYhN7yL7K6vIg2J5UZgHYVvpVVWWMT12YrdU3Vuz0NKWBaluk9sCAGwo3lA1XXJPGTqBoVTK+qGx6KGGPLpLMQj+cqgmCGx+9o=" class="">https://hackabrute.yusynth.net/MINIBRUTE/analog-board/schematics/MiniBrute-08-VCA.pdf</a></div>
<div class=""><br class="">
</div>
<div class="">What am I missing here? Is 2Vpp just fine in this case? Now reading the 2n7002 datasheet I see the forward voltage of the source-drain diode is typ 0.88V, 1.5V max. Did I just answer my own question? 😜</div>
<br id="x_x_x_x_lineBreakAtBeginningOfSignature" class="">
<div dir="ltr" class="">Cheers,
<div class="">Chris McDowell</div>
</div>
</div>
________________________________________________________<br class="">
This is the Synth-diy mailing list<br class="">
Submit email to: <a href="mailto:Synth-diy@synth-diy.org" class="">Synth-diy@synth-diy.org</a><br class="">
View archive at: <a href="https://synth-diy.org/pipermail/synth-diy/" originalsrc="https://synth-diy.org/pipermail/synth-diy/" shash="Fb85/GC+yC4U7AL4hredJdbZkM+oW1fsyNju3B69wN+wkQFmJxePLp4DDuYPLR4L7xlMNR1y4+KysighCzwHxelrJkh24wFZkvUvK5e1Z7WnwPO3q6RYAFeZSB0ekKiz8JILs9ANJnJ2tdjq7j2P4ILC0anByMlX2JadghLRVFQ=" class="">
https://synth-diy.org/pipermail/synth-diy/</a><br class="">
Check your settings at: <a href="https://synth-diy.org/mailman/listinfo/synth-diy" originalsrc="https://synth-diy.org/mailman/listinfo/synth-diy" shash="iasSPH3jh0nauJcGn8EI1s1pFF1OkNcX5TtbXkQH/SaS30UB05MLTqMNEmokl2fwnN9MLhh4vnOFbR5YTNPJcOCiR3spl0vK5/HoT0ZUcAU4xG+sP5N19CazMjgMu0yBhcj7FRlDRvQNFM/mFuG3zJA+p5vyTyc5woF0gbPh9zg=" class="">
https://synth-diy.org/mailman/listinfo/synth-diy</a><br class="">
Selling or trading? Use <a href="mailto:marketplace@synth-diy.org" class="">marketplace@synth-diy.org</a><br class="">
</div>
</blockquote>
</div>
<br class="">
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
<div class="x_x_BodyFragment"><font size="2"><span style="font-size:11pt">
<div class="x_x_PlainText">________________________________________________________<br>
This is the Synth-diy mailing list<br>
Submit email to: Synth-diy@synth-diy.org<br>
View archive at: <a href="https://synth-diy.org/pipermail/synth-diy/" originalsrc="https://synth-diy.org/pipermail/synth-diy/" shash="ZeoCVGmUeRjXaW6ZDNE0lwGBtOsZwRP0fzFPPvR2tZnq7rSavTpwEchfAbWj7aIwKu5mWb2E268V5Z5BVmRg5/+X7dc2Ctl9654wh2TczRH9VT3SuElHIrKXz1JKBcv0UK+IawiE6pNhzKSY/LfHEd0STS7oPlMKXexvM0MNJUM=">
https://synth-diy.org/pipermail/synth-diy/</a><br>
Check your settings at: <a href="https://synth-diy.org/mailman/listinfo/synth-diy" originalsrc="https://synth-diy.org/mailman/listinfo/synth-diy" shash="Toz2U8bfzKcHWJmfoPxaNIF7E7Z/11M18L4Fuj4671uMgXYqi1tdjMLlbN6NV8lbpKDTZAtjTYqWY/KVZiJPmMiAZgEbQsDeAEiC/LPb2RKTw2XkktrwpBpu3oKTDcjA6gtlk/CFa8i5zpax6zHeoFtD/VLPqu+wTp5rfSUdX2k=">
https://synth-diy.org/mailman/listinfo/synth-diy</a><br>
Selling or trading? Use marketplace@synth-diy.org<br>
</div>
</span></font></div>
</div>
</div>
</body>
</html>