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I bought a bag of the box type LCR0202 (and 0203) from aliexpress and was pretty surprised how fast they were. Tested about 4 and they were doing audio rate modulation pretty fast, would be great to test those in comparison. </div>
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>From memory the LCR0203 had light leakage from the poor insulation! Really poor part.</div>
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<b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of crystal via Synth-diy <synth-diy@synth-diy.org></div>
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<b>Sent:</b> Thursday, 23 October 2025 11:31 PM<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</div>
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<p style="margin-top: 1em; margin-bottom: 1em;"><span style="font-size: 18px;">They're not labeled, but, i think they are that same part. 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 (occasional) lower on resistance.</span></p>
<p style="margin-top: 1em; margin-bottom: 1em;"><span style="font-size: 18px;">Hadn't though to shine a light on them externally. Next time...</span></p>
<p style="margin-top: 1em; margin-bottom: 1em;">Crystal</p>
<div>On 10/20/2025 5:06 AM, mark verbos wrote:</div>
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<div>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.</div>
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<div>Mark</div>
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<div>On Oct 19, 2025, at 10:58, crystal via Synth-diy <a class="x_moz-txt-link-rfc2396E OWAAutoLink" id="OWA288a765f-6e17-ce4d-9646-2fe9a5d229ee" href="mailto:synth-diy@synth-diy.org">
<synth-diy@synth-diy.org></a> wrote:</div>
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<p style="margin-top: 1em; margin-bottom: 1em;"><span style="font-size: 18px;">Can someone point to a testing circuit for "Vactrols?"</span></p>
<p style="margin-top: 1em; margin-bottom: 1em;"><span style="font-size: 18px;">I bought a bag full of Siliconex optos years ago, they are all over the map in response time.</span></p>
<p style="margin-top: 1em; margin-bottom: 1em;"><span style="font-size: 18px;">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.</span></p>
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<p style="margin-top: 1em; margin-bottom: 1em;"><span style="font-size: 18px;">thanks,</span></p>
<p style="margin-top: 1em; margin-bottom: 1em;"><span style="font-size: 18px;"> Crystal</span></p>
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