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<DIV dir=ltr align=left><SPAN class=862232605-04122020><FONT color=#0000ff
size=2 face=Arial>Hi Bernie,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=862232605-04122020><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=862232605-04122020><FONT color=#0000ff
size=2 face=Arial>The scanners work very well at audio rates. The one I
posted the pictures of is all TL07X opamps and 2164 VCAs -- all things that
operate very well up the audio range. I don't actually have that scanner
anymore -- I built it for someone else and he took possession of it, but
maybe I'll dust off one of my other scanner designs and try it. I think I
still have an 8-channel scanner somewhere.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=862232605-04122020><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=862232605-04122020><FONT color=#0000ff
size=2 face=Arial>Incidentally, my 4- or 8-channel scanner based on crossfading
and channel switching is easily expanded to more channels. Indeed, I built
a 32-channel scanner from a 4-channel scanner and four 8-channel scanners all
controlled by the same controller -- a 4x8 matrix scanner. This I
installed in one of my "Polaris" multimode filters to get 32 different filter
modes. It worked well, but the module was literally a foot thick, because
there were more than a dozen PCBs all bolted together. I
actually gave that module to a local musician buddy of mine (he
was thrilled, and I was happy to get it outta my
garage).</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=862232605-04122020></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=862232605-04122020><FONT color=#0000ff
size=2 face=Arial>Cheers,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=862232605-04122020><FONT color=#0000ff
size=2 face=Arial>Dave</FONT> </SPAN></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
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<FONT size=2 face=Tahoma><B>From:</B> Bernard Arthur Hutchins, Jr
[mailto:bah13@cornell.edu] <BR><B>Sent:</B> Thursday, December 03, 2020 7:28
PM<BR><B>To:</B> synth-diy@synth-diy.org<BR><B>Subject:</B> [sdiy] CEM3340
question -- interpolating scanners (again)<BR></FONT><BR></DIV>
<DIV></DIV><SPAN
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Non-UBC Email]</SPAN></SPAN></SPAN>
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<DIV>David –</DIV>
<DIV><BR></DIV>
<DIV>In your video of your scanner you seem to be scanning at a sub-audio rate
exclusively (?). Thus your output is a sequence of notes (short tunes)
with each pitched note having several-to-many cycles.</DIV>
<DIV><BR></DIV>
<DIV>Have you tried scanning at an audio rate? Specifically, what if each
channel was a different waveform from the same VCO and the scan rate were
at an audio rate (perhaps 8 times higher than the VCO PLUS, say, 1 Hz)?
Each VCO waveform would be visited slightly faster than once per cycle in
an evolving manner. Wouldn’t this produce an “animated” output perhaps
similar to my “Tone Wheel Animator”? </DIV>
<DIV><BR></DIV>
<DIV>http://electronotes.netfirms.com/AES4.PDF</DIV>
<DIV><BR></DIV>Thanks -Bernie<BR></DIV></BODY></HTML>