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Ah ok thanks. Wouldn't be possible for what I want to do. Thanks.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Jacob Watters <jacobwatters@gmail.com><br>
<b>Sent:</b> 24 October 2025 01:41<br>
<b>To:</b> Brother Theo <brothertheo2014@gmail.com><br>
<b>Cc:</b> Mike Bryant <mbryant@futurehorizons.com>; SDIY <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Vactrol vs H11F1M optoFET</font>
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<div>This guy made a filter with them a long time ago and mentioned this email list:</div>
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<div dir="auto"><a href="https://youtu.be/Zpf4WLRaU0M?si=HTsYbVnvP4UHYdom">https://youtu.be/Zpf4WLRaU0M?si=HTsYbVnvP4UHYdom</a></div>
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<div dir="auto">Also, I think that RYO made a low pass gate with it, but one of the designers said that you have to lower the input volume a lot to reduce clipping.</div>
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<div dir="auto">I have some, but never got around to testing them yet.</div>
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<div dir="ltr"><font face="verdana, sans-serif" color="#444444"><b>Jacob Watters</b></font>
<div><font face="verdana, sans-serif" color="#444444"><a href="http://jacobwatters.com/" target="_blank">JacobWatters.com</a></font></div>
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<div dir="ltr" class="x_gmail_attr">On Thu, Oct 23, 2025, 8:24 p.m. Brother Theo via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br>
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<div dir="ltr">you need 2 right? one for output and one for feedback?
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<div>--TimR</div>
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<div dir="ltr" class="x_gmail_attr">On Thu, Oct 23, 2025 at 6:40 PM Mike Bryant <<a href="mailto:mbryant@futurehorizons.com" target="_blank" rel="noreferrer">mbryant@futurehorizons.com</a>> wrote:<br>
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On a related note, has anybody experience using these :</div>
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<a href="https://www.digikey.co.uk/en/products/detail/onsemi/H11F1M/1793945" target="_blank" rel="noreferrer">https://www.digikey.co.uk/en/products/detail/onsemi/H11F1M/1793945</a></div>
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Upsides and downsides ?</div>
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<div id="x_m_-6728081744089688863m_940568588702873520divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank" rel="noreferrer">synth-diy-bounces@synth-diy.org</a>>
on behalf of crystal via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank" rel="noreferrer">synth-diy@synth-diy.org</a>><br>
<b>Sent:</b> 23 October 2025 22:31<br>
<b>To:</b> mark verbos <<a href="mailto:markverbos@gmail.com" target="_blank" rel="noreferrer">markverbos@gmail.com</a>><br>
<b>Cc:</b> <a href="mailto:synth-diy@synth-diy.org" target="_blank" rel="noreferrer">
synth-diy@synth-diy.org</a> <<a href="mailto:synth-diy@synth-diy.org" target="_blank" rel="noreferrer">synth-diy@synth-diy.org</a>><br>
<b>Subject:</b> Re: [sdiy] opto isolator "Vactrol" tester</font>
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<p><font size="4">They're not labeled, but, i think they are that same part. </font><font size="4">I had some very mixed results , but, since i bought a large bag of them, i just threw the really slow parts in their own envelope. Since they were for my own
circuits i liked the </font><font size="4">(occasional) </font><font size="4">lower on resistance.</font></p>
<p><font size="4">Hadn't though to shine a light on them externally. Next time...</font></p>
<p>Crystal</p>
<div>On 10/20/2025 5:06 AM, mark verbos wrote:<br>
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<blockquote type="cite">I have had VERY unreliable experience with the Silonex parts. I used NSL-32SR3 which are meant to be the fast ones but I had places where they would take several seconds to decay. Oddly, it made a difference if I had them in an inline
resistor verses as one part of a voltage divider. Also, not necessarily a bad thing, but their on resistance is much lower than in the Vactec/PerkinElmer/Excilitas ones.
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<div>Mark<br>
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<div>On Oct 19, 2025, at 10:58, crystal via Synth-diy <a href="mailto:synth-diy@synth-diy.org" target="_blank" rel="noreferrer">
<synth-diy@synth-diy.org></a> wrote:</div>
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<p><font size="4">Can someone point to a testing circuit for "Vactrols?"</font></p>
<p><font size="4">I bought a bag full of Siliconex optos years ago, they are all over the map in response time.</font></p>
<p><font size="4">I had tested quite a few in a very crude breadboard setup, mostly just looking at on/off resistance timing and off resistance and then putting them in envelopes with details written on them. I'm sure i could do that again, i'm just wondering
if it's been done better.</font></p>
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<p><font size="4">thanks,</font></p>
<p><font size="4"> Crystal</font></p>
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