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<DIV dir=ltr align=left><SPAN class=783101905-30112020><FONT color=#0000ff
size=2 face=Arial>Yes, that's what I'd try first. This is essentially what
the Linear/Expo pot on the Intellijel uVCA does, so somewhere in the middle
would be a constant-power-like gain curve.</FONT></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>Dakota
Melin<BR><B>Sent:</B> Sunday, November 29, 2020 6:30 PM<BR><B>To:</B> synth-diy
mailing list<BR><B>Subject:</B> Re: [sdiy] THAT2180A<BR></FONT><BR></DIV>
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<DIV dir=ltr>voltage divide the CV in between the linearizing VCA and the audio
VCA and you are pretty close. And David, YOU are the one who told ME that I do
believe..<BR></DIV><BR>
<DIV class=gmail_quote>
<DIV dir=ltr class=gmail_attr>On Sun, Nov 29, 2020 at 8:44 PM David G Dixon
<<A href="mailto:dixon@mail.ubc.ca">dixon@mail.ubc.ca</A>>
wrote:<BR></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>The THAT circuit looked really complicated for making an
equal power panner.<BR>I'd use a pair of linearized 2164 VCAs, and send them
the sine and cosine of<BR>a control voltage ramp. These I'd generate by
setting up a 0V to +5V ramp<BR>and its inverse, and sending these through
tri-2-sine converters, for which<BR>one could use either the transistor
pair-diff amp combo or a 13700.<BR>Alternatively, one could fit the sine and
cosine with line segments using<BR>diode-resistor networks a la Horowitz and
Hill Figure 4-94.<BR><BR>What am I missing here? Why is this so
hard?<BR><BR><BR><BR>-----Original Message-----<BR>From: Synth-diy [mailto:<A
href="mailto:synth-diy-bounces@synth-diy.org"
target=_blank>synth-diy-bounces@synth-diy.org</A>] On Behalf Of
Tom<BR>Wiltshire<BR>Sent: Sunday, November 29, 2020 4:11 PM<BR>To:
drheqx<BR>Cc: synth-diy mailing list<BR>Subject: Re: [sdiy]
THAT2180A<BR><BR>[CAUTION: Non-UBC Email]<BR><BR><BR>> On 29 Nov 2020, at
04:54, drheqx <<A href="mailto:drheqx@gmail.com"
target=_blank>drheqx@gmail.com</A>> wrote:<BR>> <BR>> Thank you Tom.
The DAC idea is really cool. It's true, performance will<BR>dictate
performance. I can get away with less noise performance here but
the<BR>linearity is important. Some of these pan circuits have a bump in the
middle<BR>or a dip. I'll have to work that part out. This is something where
a<BR>musician would certainly notice that bump. <BR><BR>I did, and I'm no
great musician.<BR><BR>On circuits with the bump the sound seems to get nearer
as you pan it across<BR>the spectrum, like the sound moves along a straight
line from left to right<BR>just in front of you, so the centre point is much
closer than the far ends<BR>of the line. On other circuits, you get the
opposite effect, where the<BR>centre dips and the signal seems to disappear
into the distance, so it spins<BR>from by your left ear, to miles in front of
you, round to by your right ear.<BR>Neither sounds "even". The ideal is
something that gives a sound that seems<BR>to rotate around you with you at
the centre, not moving closer or further<BR>away. The exact listening set-up
obviously will affect how that illusion is<BR>to be created, but the aim is
pretty
clear.<BR><BR><BR><BR>_______________________________________________<BR>Synth-diy
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