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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Designs of voltage/current controlled resistance
Date: Wed, 21 May 2025 16:03:54 -0400
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"John R Walliker" <jrwalliker@gmail.com> wrote in message news:100l974$2nno5$1@dont-email.me...
> On 21/05/2025 17:26, Edward Rawde wrote:
>> "RodionGork" <rodiongork@github.com> wrote in message news:d469c760bbcd14a1f148c0e1b29653f7@www.novabbs.com...
>>> Hi Friends!
>>>
>>> What approaches exist of creating voltage or current-controlled
>>> resistance?
>>
>> Usually opto devices or FETs.
>> It has been recently demonstrated here that there are other approaches but it depends on what you're trying to achieve.
>
> To be more specific, have a look at the H11F1 which is an LED
> coupled with a bidirectional light sensitive FET.  This has been
> around for many decades but is still available.
> John
>

Thanks. Interesting device, and LTSpice models exist.