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<p>Personally I feel this is Coolaudio muscling it - I have used
their 2164s before but prefer to support the small guys who've
made the bold step to work on producing chips - Alfa & Sound
Semiconductor. <br>
I've still yet to really test the Alfa samples I've received but
they've been good to deal with (I have a roll of S08 AS394 matched
NPNs to use shortly) - SoundSemi have been really excellent &
have great support & documentation for their small but classy
range of chips.</p>
<p>Slight offtopic, sorry ;)<br>
</p>
<div class="moz-cite-prefix">On 27/03/2021 18:34, Tom Wiltshire
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5A26275D-DC81-4EA1-B006-89A4D8F5C7EA@electricdruid.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
CoolAudio lowered their prices significantly is what happened, for
both V3340 and V3320. Alfa’s previously much lower prices might
well be a part of the reason why. Either way, Coolaudio's chips
suddenly got a lot more appealing.
<div class=""><br class="">
</div>
<div class="">The 3320 has a maximum current (100uA or so) for the
resonance control input. As long as you put a large enough
resistor in front of it for the voltage you’re using, there’s no
problem. It’d be nice if they made this more obvious, instead of
merely implying it with a 100K resistor on the datasheet
circuit, but that’s exactly the same as the CEM3320, and as the
CEM datasheet.<br class="">
<div class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 27 Mar 2021, at 15:57, Benjamin Tremblay
via Synth-diy <<a
href="mailto:Synth-diy@synth-diy.org" class=""
moz-do-not-send="true">Synth-diy@synth-diy.org</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
<div style="word-wrap: break-word; -webkit-nbsp-mode:
space; line-break: after-white-space;" class="">And I
have noticed vendors are moving away from some of the
AS chips.
<div class="">
<div class="">Coolaudio is eating their lunch.</div>
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On Mar 27, 2021, at 11:46 AM,
Benjamin Tremblay <<a
href="mailto:btremblay@me.com" class=""
moz-do-not-send="true">btremblay@me.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8" class="">
<div style="word-wrap: break-word;
-webkit-nbsp-mode: space; line-break:
after-white-space;" class=""><span
style="font-size: 14px;" class="">I have
not tried the VCO, but have had great
results with the 3320 VCF and the 3360
VCA. It’s pretty much Pro One for the
masses.</span>
<div style="font-size: 14px;" class="">The
3320 is easy to damage if you over-power
the resonance control. </div>
<div class=""><span style="font-size: 14px;"
class="">The 3360 can be tamed once you
work within the correct control voltage
range. </span><br style="font-size:
14px;" class="">
<div class=""><span style="font-size:
14px;" class="">I’m an idiot. I don’t
have a scope. But they sound great and
I was able to get them stood up and
move on to the rest of my project. </span></div>
<div class=""><span style="font-size:
14px;" class=""><br class="">
</span></div>
<div class=""><span style="font-size:
14px;" class="">I’m also using a
number of AS2164 chips. I have never
used other brands, but these work
great for computer-controlled mixers
of analog signals.</span></div>
<div class=""><span style="font-size:
14px;" class="">I made no effort
to squeeze any gain out of them using
negative voltage bias on the control
pins. They work fine for
my application.</span></div>
<div class="">
<div style="font-size: 14px;" class=""><br
class="">
</div>
<div style="font-size: 14px;" class="">I
still have some 3330 VCA chips. They
were very frustrating to use. They
seem to require a low-impedance
voltage divider that gets very noisy
without careful placement of
capacitors. </div>
<div class=""><span style="font-size:
14px;" class="">Maybe if I go back
and try to breadboard them after
having learned the 3360 I could be
more successful. </span><br
style="font-size: 14px;" class="">
<div style="font-size: 14px;" class=""><br
class="">
<blockquote type="cite" class="">
<div class="">On Mar 27, 2021, at
11:19 AM, cheater cheater <<a
href="mailto:cheater00social@gmail.com" class="" moz-do-not-send="true">cheater00social@gmail.com</a>>
wrote:</div>
<br
class="Apple-interchange-newline">
<div class="">
<div class="">I was wondering if
anyone had any experiences
with ALFA clones of<br
class="">
classic chips. Are they good?
Is anything missing? Are they
very crap?<br class="">
No difference at all? Any
specific ones to watch out
for?<br class="">
<br class="">
Thanks<br class="">
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