[sdiy] THAT2180A

[Dakota Melin]

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..

On Sun, Nov 29, 2020 at 8:44 PM David G Dixon <dixon at mail.ubc.ca> wrote:

> The THAT circuit looked really complicated for making an equal power
> panner.
> I'd use a pair of linearized 2164 VCAs, and send them the sine and cosine
> of
> a control voltage ramp.  These I'd generate by setting up a 0V to +5V ramp
> and its inverse, and sending these through tri-2-sine converters, for which
> one could use either the transistor pair-diff amp combo or a 13700.
> Alternatively, one could fit the sine and cosine with line segments using
> diode-resistor networks a la Horowitz and Hill Figure 4-94.
>
> What am I missing here?  Why is this so hard?
>
>
>
> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Tom
> Wiltshire
> Sent: Sunday, November 29, 2020 4:11 PM
> To: drheqx
> Cc: synth-diy mailing list
> Subject: Re: [sdiy] THAT2180A
>
> [CAUTION: Non-UBC Email]
>
>
> > On 29 Nov 2020, at 04:54, drheqx <drheqx at gmail.com> wrote:
> >
> > Thank you Tom. The DAC idea is really cool. It's true, performance will
> dictate performance. I can get away with less noise performance here but
> the
> linearity is important. Some of these pan circuits have a bump in the
> middle
> or a dip. I'll have to work that part out. This is something where a
> musician would certainly notice that bump.
>
> I did, and I'm no great musician.
>
> On circuits with the bump the sound seems to get nearer as you pan it
> across
> the spectrum, like the sound moves along a straight line from left to right
> just in front of you, so the centre point is much closer than the far ends
> of the line. On other circuits, you get the opposite effect, where the
> centre dips and the signal seems to disappear into the distance, so it
> spins
> from by your left ear, to miles in front of you, round to by your right
> ear.
> Neither sounds "even". The ideal is something that gives a sound that seems
> to rotate around you with you at the centre, not moving closer or further
> away. The exact listening set-up obviously will affect how that illusion is
> to be created, but the aim is pretty clear.
>
>
>
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