On 12/23/14 11:36 PM, Andrew Simper wrote:
On 24 December 2014 at 08:55, robert bristow-johnson
wrote:
the OTAs are there for voltage-controlled gain or, really, a
voltage-controlled resistor to change the tuning of the VCF. from the
datasheet
They are an idealised voltage controlled current
PS:
>> Anyway, please forget about it diagram if it confuses you.
>
> legit circuit diagrams ain't confusing. signal flow diagrams ain't
> confusing. mixed metaphors can be confusing. wires are sorta physical
> things that you can do Kirchoff's laws on, signal paths are more like
> information
On 24 December 2014 at 08:55, robert bristow-johnson
wrote:
> the OTAs are there for voltage-controlled gain or, really, a
> voltage-controlled resistor to change the tuning of the VCF. from the
> datasheet
They are an idealised voltage controlled current source, it looks
neater to use an OTA sy
On 12/23/14 4:43 AM, Andrew Simper wrote:
Everyone on the synth diy list didn't even bat an eyelid at that
diagram, they just said stuff like "Thanks" and "That's very
interesting, I have not seen it done that way before."
i'm not ashamed to point out what i don't know. you can't spell
"analy
> completely different inputs, this is not summing three different
> output signals.
to clarify I meant to say : this is not summing three output signals
(low, band, high) from the same input signal like you can do with an
SVF
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Hi Robert,
Everyone on the synth diy list didn't even bat an eyelid at that
diagram, they just said stuff like "Thanks" and "That's very
interesting, I have not seen it done that way before."
It is the way that you can mix the inputs into a Sallen Key filter
that is new. I have checked David Dixo
On 12/22/14 12:27 AM, Andrew Simper wrote:
I've seen in many Sallen Key circuits people stick the input signal into
various points to generate some different responses, but always the high
pass is only 1 pole.
i haven't seen that with the SK. for HPF, i've only seen it with the the
R's and C's
>> I've seen in many Sallen Key circuits people stick the input signal into
>> various points to generate some different responses, but always the high
>> pass is only 1 pole.
>
> i haven't seen that with the SK. for HPF, i've only seen it with the the
> R's and C's swapped. like with
> http://si
On 12/21/14 1:12 AM, Andrew Simper wrote:
Hi Guys,
Something I've had on the backburner for a while, but now I've finished my
new product I've had time to finish.
I've seen in many Sallen Key circuits people stick the input signal into
various points to generate some different responses, but al
On 12/21/14 1:01 PM, Andrew Simper wrote:
I've updated the diagram of the filter to be a little prettier in the full
pdf, and I've also uploaded it as a jpg here:
http://cytomic.com/files/dsp/SkfInputMixing.jpg
i don't see how one analyzes that circuit since c1 and c2 are not
connected to an
Thanks for spotting the typo Ross!
I've updated the diagram of the filter to be a little prettier in the full
pdf, and I've also uploaded it as a jpg here:
http://cytomic.com/files/dsp/SkfInputMixing.jpg
Andy
-- cytomic -- sound music software --
On 21 December 2014 at 20:56, Ross Bencina
wro
On 21/12/2014 5:12 PM, Andrew Simper wrote:
and all the other papers (including the SVF version of the same thing I did
a while back) are always available here:
www.cytomic.com/techincal-papers
Actually:
http://www.cytomic.com/technical-papers
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Hi Guys,
Something I've had on the backburner for a while, but now I've finished my
new product I've had time to finish.
I've seen in many Sallen Key circuits people stick the input signal into
various points to generate some different responses, but always the high
pass is only 1 pole. A while b
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