[sdiy] Vactrol vs H11F1M optoFET

[Brother Theo]

you need 2 right? one for output and one for feedback?

--TimR

On Thu, Oct 23, 2025 at 6:40 PM Mike Bryant <mbryant at futurehorizons.com>
wrote:

> On a related note, has anybody experience using these :
>
> https://www.digikey.co.uk/en/products/detail/onsemi/H11F1M/1793945
>
> Upsides and downsides ?
> ------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of crystal
> via Synth-diy <synth-diy at synth-diy.org>
> *Sent:* 23 October 2025 22:31
> *To:* mark verbos <markverbos at gmail.com>
> *Cc:* synth-diy at synth-diy.org <synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] opto isolator "Vactrol" tester
>
>
> 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>
> <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
>
>
> ________________________________________________________
> 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/20251023/12393a62/attachment.htm>