[sdiy] New VCO... maybe...

[Richie Burnett]

That's neat Roman!  I enjoyed reading the write up too.

Can you compensate for the reset time in the usual way with a carefully 
chosen resistor in series with the integrator capacitor?  Or won't that work 
in this topology?

-Richie,



-----Original Message----- 
From: Roman Sowa
Sent: Thursday, December 10, 2020 9:42 AM
To: Spiros Makris
Cc: SYNTH DIY
Subject: Re: [sdiy] New VCO... maybe...

The idea behind it was to keep parts count low. I's appealing when one
14-pin chip does basicaly all.
I plan to use comparator and dual opamps instead of quad in SMD version
of it. But I don't expect much improvement, 500ns instead of 2us reset
time by the cost of using completely different ICs would be huge success.
If my estimations are correct, current HF tracking error is 15 cents at
4kHz, while with 0.5us reset it could go down to 4 cents. Some sort of
compensation is probably simpler than speeding up the circuit.

Roman

W dniu 2020-12-10 o 09:44, Spiros Makris pisze:
> Have you tried using a dedicated comparator IC instead of an opamp? Opamps 
> make pretty bad comparators in practice, perhaps you can extend your range 
> somewhat by changing it.
>
> On Thu, Dec 10, 2020 at 9:49 AM Roman Sowa <modular at go2.pl 
> <mailto:modular at go2.pl>> wrote:
>
>     That still would be better than turning this list into C
>     programmer's chat.
>
>     Also please, no disrespect to anybody
>
>     Roman
>
>     W dniu 2020-12-10 o 05:11, Shawn Rakestraw pisze:
>      > I am patiently waiting for Mr Hutchins to split the thread off into
>      > his own and lead off with a paper about why making CDs won't work,
>      > then explain that this has already been done.
>      >
>      > And PLEASE take this with the humor that I intend it as! No
>      > disrespect, just humor :)
>      >
>      > On Wed, Dec 9, 2020 at 6:21 PM Aaron B. <aaron at zadzmo.org
>     <mailto:aaron at zadzmo.org>
>      > <mailto:aaron at zadzmo.org <mailto:aaron at zadzmo.org>>> wrote:
>      >
>      >     On Wed, 9 Dec 2020 22:56:22 +0100
>      >     Roman Sowa <modular at go2.pl <mailto:modular at go2.pl>
>     <mailto:modular at go2.pl <mailto:modular at go2.pl>>> wrote:
>      >
>      >     > I haven't used that phrase for long, so here it goes:
>      >     > Comments welcome!
>      >     >
>      >
>
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