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<DIV><FONT size=2>Yes, the MOTM-510 uses this chip (the cat's out of the
bag!!!)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>You can also do it with "discrete" log-antilog amps: there are
several circuits in the "Non-Linear Handbook" (Analog Devices).</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Paul S.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=destrukto@gmx.net href="mailto:destrukto@gmx.net">Ryan Williams</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=synth-diy@dropmix.xs4all.nl
href="mailto:synth-diy@dropmix.xs4all.nl">synth-diy@dropmix.xs4all.nl</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, January 31, 2004 9:20
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [sdiy] Analog Computational
Unit</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>I was looking at the analog devices site and I'm
came across this IC.</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.analog.com/UploadedFiles/Data_Sheets/737468486AD538_c.pdf">http://www.analog.com/UploadedFiles/Data_Sheets/737468486AD538_c.pdf</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>AD538. It's a realtime analog computational unit
with the transfer function:</FONT>
<DIV><FONT face=Arial size=2>Vout = Vy*(Vz/Vx)^m</FONT></DIV></DIV>
<DIV><FONT face=Arial size=2>Vy, Vz, and Vx are inputs and m is chosen with
resistors. m can range from 1/5 to 5.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I thought this might make an interesting module
but I'm not quite sure how to go about using it for audio. I wonder if
anyone has thought of building something similar? After looking around I found
the MOTM wavewarper which seems to do exactly this. I wonder if it uses the
same chip.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>this IC costs about $35 but I figure if it sounds
cool then it'd be worth it.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>-Ryan</FONT></DIV></BLOCKQUOTE></BODY></HTML>