[sdiy] opto isolator "Vactrol" tester

[crystal]

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.

Hadn't though to shine a light on them externally. Next time...

Crystal

On 10/20/2025 5:06 AM, mark verbos wrote:
> 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
>>
>> ________________________________________________________
>> This is the Synth-diy mailing list
>> Submit email to: Synth-diy at synth-diy.org
>> View archive at: https://synth-diy.org/pipermail/synth-diy/
>> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20251023/09c8d061/attachment.htm>