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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">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="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of crystal via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> 23 October 2025 22:31<br>
<b>To:</b> mark verbos <markverbos@gmail.com><br>
<b>Cc:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><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 class="x_moz-cite-prefix">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 class="x_moz-txt-link-rfc2396E" href="mailto:synth-diy@synth-diy.org">
<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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