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<p>I think that is what I was trying to say but the heat wave in
Portland is melting by brain...<br>
</p>
<br>
<div class="moz-cite-prefix">On 8/7/2018 7:20 PM, Quincas Moreira
wrote:<br>
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cite="mid:CA+u0Jt=Js+bvSkBNRoDAbgYBNoF+26vx6fxAtk94NHYU2A3+ZA@mail.gmail.com">
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<div dir="ltr">I say keep the diode in case somebody drops in an
SSM as a replacement...</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Tue, Aug 7, 2018 at 7:53 PM Tim Ressel <<a
href="mailto:timr@circuitabbey.com" moz-do-not-send="true">timr@circuitabbey.com</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Yeah, upon
further study I realize it is moot. 0 Volts = unity gain and <br>
higher voltages reduce the gain i.e. attenuate. The SSM2164
sez max <br>
voltage on the control port is -V to +V while the SSI2164 data
sheet <br>
doesn't seem to say anything about range so I assume it is the
same.<br>
<br>
So I dropped my flag in error. Sorry about that.<br>
<br>
Apparently the protection diode is not needed with the SSI2164
but maybe <br>
use it anyway. They is cheap.<br>
<br>
All in all a good chip. Glad it is available.<br>
--tr<br>
<br>
On 8/7/2018 3:15 PM, Tom Wiltshire wrote:<br>
> No, it means the original datasheet was full of nonsense.
That 0-5V input was never correct, and didn’t make sense even
with the rest of the stuff they said.<br>
><br>
>> On 7 Aug 2018, at 22:35, Tim Ressel <<a
href="mailto:timr@circuitabbey.com" target="_blank"
moz-do-not-send="true">timr@circuitabbey.com</a>> wrote:<br>
>><br>
>> Flag on the play<br>
>><br>
>> The SSI2164 is saying 0 to 3.3 volts on the control
port for attenuation whereas the SSM2164 says 0 to 5 volts.
Does this mean it is not a direct replacement for the SSM2164?<br>
>><br>
>> --TimR<br>
>><br>
>><br>
>> On 8/7/2018 1:41 PM, Neil Johnson wrote:<br>
>>> Hi all,<br>
>>><br>
>>> Anyone with more than a passing interest in the
2164 quad VCA might be<br>
>>> interested in the latest version of the SSI2164
datasheet just<br>
>>> published online by Sound Semiconductor.<br>
>>><br>
>>> While specifically for the SSI2164 there is a lot
of useful info there<br>
>>> that also relates to the earlier SSM2164 (and the
Behringer/CoolAudio<br>
>>> V2164 clone).<br>
>>><br>
>>> Highlights for me:<br>
>>> * Explanation and formula for working out the
compensation network<br>
>>> (confirms my earlier hand-wavey analysis)<br>
>>> * A superior expo converter by Dave Rossum<br>
>>> * More details on the internal workings<br>
>>><br>
>>> Direct link: <a
href="http://www.soundsemiconductor.com/downloads/ssi2164datasheet.pdf"
rel="noreferrer" target="_blank" moz-do-not-send="true">http://www.soundsemiconductor.com/downloads/ssi2164datasheet.pdf</a><br>
>>><br>
>>> Cheers<br>
>>> Neil<br>
>> -- <br>
>> --Tim Ressel<br>
>> Circuit Abbey<br>
>> <a href="mailto:timr@circuitabbey.com"
target="_blank" moz-do-not-send="true">timr@circuitabbey.com</a><br>
>><br>
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<br>
-- <br>
--Tim Ressel<br>
Circuit Abbey<br>
<a href="mailto:timr@circuitabbey.com" target="_blank"
moz-do-not-send="true">timr@circuitabbey.com</a><br>
<br>
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-- <br>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">
<div>Quincas Moreira<br>
Synth Diy Guy</div>
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<br>
<pre class="moz-signature" cols="72">--
--Tim Ressel
Circuit Abbey
<a class="moz-txt-link-abbreviated" href="mailto:timr@circuitabbey.com">timr@circuitabbey.com</a></pre>
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