[sdiy] Lowest distortion neede for VCA - linearizing the LM13600/13700 & other dual VCAs

Neil Johnson neil.johnson71 at gmail.com
Wed Sep 18 10:31:11 CEST 2013


David,


In the context of this thread "linearizing" means low distortion
rather than the control function.

On paper at least a 2164 gain cell has about the same THD as the
souped-up LM13600 Sims circuit using both halves of a 13600.

Neil


>
>
>> ASSI wrote:
>> > The I/V conversion you care about is done by the input
>> resistor.  The
>> > OTA produces a matching current to compensate the input
>> current via feedback.
>> ...etc...
>>
>> Interesting, thanks for clarifying.  Ultimately, the question really
>> is: is this really cheaper than 1/4 of an SSM2164 (or CoolAudio V2164
>> clone) these days?  Maybe 18 years ago when this circuit was posted.
>> Certainly a lot more PCB area (16pin DIP + 8pin DIP + transistor +
>> passives) compared to 1/4 of a 2164.
>>
>> > (on the road :-)
>>
>> Awesome!
>>
>> Cheers,
>> Neil
>



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--
http://www.njohnson.co.uk



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