[sdiy] discrete ota trimming

[mark verbos]

That's what I was referring to last week, when this came up. It's what 
you'll find in the Buchla triangle VCOs. I don't know about the 3096 tho.

Mark


Ryan Williams wrote:

> hi all,
>
> I just got some samples from intersil of the HFA3096 3NPN, 2PNP array. 
> I wanted to try some experiments for discrete OTAs in VCFs with these. 
> the OTA circuit is basically like the one used in the JH ssm2040 
> filter. What I am unsure about is the best way to add a trimmer. 
> Here's what I have now that works in simulations ok:
>
> http://www.sdiy.org/destrukto/schematics/discrete_ota.gif
>
> so, is that a bad way to do it? should I put the trimmer on one of the 
> Vin pins instead like what is normally done in CA3080 type circuits? I 
> deffinently want to be able to trim the offset. this is going to be 
> for a state variable filter.
>
> thanks--Ryan
>
>