[sdiy] LM13700 as VC resistor

Didier Leplae didierleplae at yahoo.com
Sun Feb 9 20:22:05 CET 2020


I wonder if he left because he called this list 99% spam!😂😂😂

> On Feb 9, 2020, at 12:07 PM, Jacob Watters <jacobwatters at gmail.com> wrote:
> 
> 
> Dan A. Made a filter with the H11F1 in 2012 after hearing about the chip in this email list.
> 
> https://youtu.be/Zpf4WLRaU0M
> 
> He is usually fairly responsive in his comments. You could ask there (or maybe he is still in this email list too).
> 
>> On Sat., Feb. 8, 2020, 8:39 p.m. , <eidorian at aladan.net> wrote:
>> The prodigious and awesome Gieskes uses H11F1 in the 3trins, for voltage 
>> control over a video-frequency schmidt-trigger based oscillator.
>> 
>> https://gieskes.nl/instruments/?file=3TrinsRGB1
>> 
>> https://gieskes.nl/
>> 
>> Cheers,
>> A.
>> 
>> ---
>> 
>> 
>> On 09-02-2020 12:21, Didier Leplae via Synth-diy wrote:
>> > I searched a bit in the archives, but didn’t find anything.
>> > The H11F1 sounds interesting. I will look into that.
>> > 
>> > 
>> >> On Feb 8, 2020, at 12:05 PM, music.maker at gte.net wrote:
>> >> 
>> >> 
>> >> 
>> >> This has been bugging me because I seem to remember a thread here 
>> >> years ago.  I can't
>> >> remember what the outcome was, but maybe a search of the archives (for 
>> >> which I seem to have
>> >> no foo) might find it.  I do remember it was regarding the datasheet 
>> >> circuits mentioned by
>> >> the OP.  Generally, the feel I think was that under the right circuit 
>> >> circumstances, it can
>> >> work like a VCresistor.  I remember that the vactrol was compared and 
>> >> is known to work
>> >> properly as a floating VCresistor albeit slow to change value.  Not an 
>> >> EE here, but looking
>> >> at the floating resistor circuit I see two current producing 
>> >> electrodes posing as a
>> >> floating resistor.  I think generally the statement about it's lack of 
>> >> use in synth
>> >> circuits is due to it not being very good is probably correct.  
>> >> Looking at the single ended
>> >> circuits, they are AC coupled...
>> >> 
>> >> Has anyone experience with H11F1 devices?  Those should be a lot 
>> >> faster than vactrols,
>> >> probably more consistent, but I don't know if the transfer function is 
>> >> useful in
>> >> audio/synth circuits.
>> >> 
>> >> -- ScottG
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>> > 
>> > 
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