[sdiy] opto isolator "Vactrol" tester

[mark verbos]

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.

Mark




> On Oct 19, 2025, at 10:58, crystal via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> Can someone point to a testing circuit for "Vactrols?"
> 
> I bought a bag full of Siliconex optos years ago, they are all over the map in response time.
> 
> 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.
> 
> 
> 
> thanks,
> 
>  Crystal
> 
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