<html><head><meta http-equiv="content-type" content="text/html; charset=us-ascii"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">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><br></div><div>Mark<br><div><br></div><div><br></div><div><br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On Oct 19, 2025, at 10:58, crystal via Synth-diy <synth-diy@synth-diy.org> wrote:</div><br class="Apple-interchange-newline"><div>
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<div text="#000000" bgcolor="#FFFFFF"><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><p><font size="4"><br>
</font></p><p><font size="4">thanks,</font></p><p><font size="4"> Crystal</font></p>
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