[sdiy] Best AVAILABLE OTA for building new designs?

[Mattias Rickardsson]

Hi Dan,

Returning to the OP questions about today's OTAs, I'm curious to hear if
you specifically need OTAs and some of their properties (linear control,
differential inputs, voltage levels, current/voltage interfacing, etc), or
if VCAs would also be an alternative?

SSI2164 quad VCA is mentioned often since it's very easy and fun to design
with, but if I'd need a linear control I'd probably look for more
alternatives before I'd used the linearized 2164 method. It's not the
"best" VCA in terms of hi-fi quality, but it's very good - good enough for
synths and great price/performance compared to the hi-fi mixing console
ones. Also very handy to apply in designs, with a useful dB/V law, and with
a huge community knowledge base, which is another variant of "best".

Perhaps you're already skilled in OTA design and prefer continuing using
OTAs when it works, which is understandable. :-)

/mr  -  wouldn't be surprised if a new even better OTA chip saw the light
of day soon

Den tors 8 aug. 2024 20:14Dan Snazelle via Synth-diy <
synth-diy at synth-diy.org> skrev:

> imagine someone asked you to make some new synth modules.
> then imagine that the last time you did so in any quantity above one---
> it was 2017.
>
>
> I am trying to get a handle on what the parts landscape is like now for
> cost-effective CV control. Back in 2017 the lm13700 was really the only
> available OTA . I was just starting to work with the ssm2164 at the time
> but never used it extensively.
>
> In the interim I have built synth circuits but only in quantities of one
> where cost was no object and I was able to rely on my own extensive parts
> supply.
>
>
> So my question is this-- if I am thinking about design for manufacturing—what
> do you think the best option is?
>
> Has anyone tried the quad ALFA OTA? Is it even readily available? Same for
> the new SSM2040​.
>
> OR would you just use the 2164 instead?
> OR would you just try to make discrete OTAS out of say the  BCM856DS
> //BCM847BS
>
> thanks for any and all opinions on this.
>
>
>
>
>
>
>
>
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