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<DIV dir=ltr align=left><SPAN class=336201316-09082024>That sounds great.
My only issue is price -- The AS3364 seems to cost about $7 or more, depending
on the source, and it does not seem to be possible to buy them directly from
Alfa -- at least, I don't see any obvious way to do so from their
website.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=336201316-09082024></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=336201316-09082024>My latest project is
going to require about 250 2164 ICs. That's not a problem given what I'm
paying for them. Yes, in all but the filter application, the 2164s are all
linearized, but I'm paying about 23 cents for TL074s and about 1 cent for 561
caps, so from a cost perspective, it just doesn't make much sense.
Linearizing 2164 does add an inch or so to the PCB real estate, but I'm sending
the same voltage to a large number (48) of 2164s, so even though they are
linearized, only one logarithmic amplifier is needed for all of those
2164s. I do need to buffer those CVs locally, so there is a TL074 sitting
next to the 2164, but I would need to do that with the 3364 as well (the
datasheet is silent on the input impedance of the control pins (big negative
issue for me), but I presume that it is measured in kilo-ohms, not
tera-ohms). And, I'm getting four linearized amplifiers from each 2164
this way as well, rather than the customary two.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=336201316-09082024></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=336201316-09082024>I also (mostly now) use
the 2164 as a four-quadrant (or variable-quadrant) multiplier, and it is not
clear whether the 3364 is amenable to that application.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=336201316-09082024></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=336201316-09082024>If I could get the AS3364
for less than $2 each, then I'd probably get more serious about using
them.</SPAN></DIV><BR>
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<FONT size=2 face=Tahoma><B>From:</B> Synth-diy
[mailto:synth-diy-bounces@synth-diy.org] <B>On Behalf Of </B>mark verbos via
Synth-diy<BR><B>Sent:</B> Friday, August 09, 2024 8:50 AM<BR><B>To:</B> Dan
Snazelle<BR><B>Cc:</B> synth-diy@synth-diy.org<BR><B>Subject:</B> Re: [sdiy]
Best AVAILABLE OTA for building new designs?<BR></FONT><BR></DIV>
<DIV></DIV>
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Non-UBC Email]</FONT></TD></TR></TBODY></TABLE>Dan,
<DIV><BR></DIV>
<DIV>I’ve been using the AS2164 only when I need the exponential response. If I
need linear VCAs I now use the AS3364, which is more or less a clone of the
SSM2024. That’s the same pinout more or less as the SSM2164 but has linear
response. So, it’s very easy to use, pretrimmed, quiet, CV referenced to ground,
summing node signal ins, doesn’t require all of those 560p caps. That works out
great when lots of VCAs are needed, Some people were really turned off by the 1%
harmonic distortion, but I have yet to notice an distortion on a synth
circuit. </DIV>
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<DIV><BR></DIV>
<DIV>Mark</DIV>
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<DIV>On Aug 8, 2024, at 8:08 PM, Dan Snazelle via Synth-diy
<synth-diy@synth-diy.org> wrote:</DIV><BR
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<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof>imagine someone asked you to make some new synth
modules.</DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof>then imagine that the last time you did so in any
quantity above one--- it was 2017. </DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof><BR></DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof><BR></DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof>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.</DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof><BR></DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof>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. </DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof><BR></DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof><BR></DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof>So my question is this-- if I am thinking about design
for manufacturing<SPAN style="DISPLAY: inline-block"
class="_Entity _EType_OWA_HYPHEN _EId_OWA_HYPHEN_1 _EReadonly_1"><SPAN
id=hyphen2 class=hyphen>—</SPAN></SPAN>what do you think the best option
is? </DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof><BR></DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof>Has anyone tried the quad ALFA OTA? Is it even readily
available? Same for the new SSM2040. </DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof><BR></DIV>
<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof>OR would you just use the 2164 instead? </DIV>
<DIV
style="LINE-HEIGHT: normal; MARGIN: 0px; FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof>OR would you just try to make discrete OTAS out of say
the BCM856DS //BCM847BS</DIV>
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class=elementToProof><BR></DIV>
<DIV
style="LINE-HEIGHT: normal; MARGIN: 0px; FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof>thanks for any and all opinions on this. </DIV>
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<DIV style="FONT-FAMILY: Calibri, Helvetica, sans-serif; FONT-SIZE: 12pt"
class=elementToProof><BR></DIV></DIV>________________________________________________________<BR>This
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