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PWM / clock

PWM / clock

2008-09-11 by Matt Carpenter

Hi,
What are some ways to achieve pulse-width modulation that results in a
signal able to act as a clock? I know I can use an NTO to get a nice
pwm sound and an NCOM to get a clock with variable pulse-width -- is
there anything else?

Thanks,
Matt

Re: PWM / clock

2008-09-12 by Matt Carpenter

I just did it with the Schmitt Triggers, too. Very cool.

Any others?

p.s. did someone reply to me off-list? i may've deleted your e-mail
accidentally...
Show quoted textHide quoted text

--- In SergeModular@yahoogroups.com, "Matt Carpenter"
<matfhew.carpenfer@...> wrote:
>
> Hi,
> What are some ways to achieve pulse-width modulation that results in a
> signal able to act as a clock? I know I can use an NTO to get a nice
> pwm sound and an NCOM to get a clock with variable pulse-width -- is
> there anything else?
>
> Thanks,
> Matt
>

Re: PWM / clock

2008-09-12 by matthew carpenter

Eh, ok, maybe I should've had this brainstorm before I posted! I just found another way -- by adding a slight DC offset to the NTO Variable Wave Out with a processor such as the lower half of an ACPR (1 o'clock), I get a pulse capable of clocking a sequencer.
Show quoted textHide quoted text
On 9/11/08, Matt Carpenter <matfhew.carpenfer@...> wrote:

I just did it with the Schmitt Triggers, too. Very cool.

Any others?

p.s. did someone reply to me off-list? i may've deleted your e-mail
accidentally...

--- In SergeModular@yahoogroups.com, "Matt Carpenter"
<matfhew.carpenfer@...> wrote:
>
> Hi,
> What are some ways to achieve pulse-width modulation that results in a
> signal able to act as a clock? I know I can use an NTO to get a nice
> pwm sound and an NCOM to get a clock with variable pulse-width -- is
> there anything else?
>
> Thanks,
> Matt
>


Re: PWM / clock

2008-09-12 by John P

Any comparator will do it, not just ncom. Also the DSG and some of its
cousins, setting the VC switch to RISE or FALL will modulate the duty
cycle of the GATE pulse wave. OUT 2 of the VCM bottom section delivers
pulse waves that can be modulated by VC or the knob. And the SSG CUPL
output compares SMOOTH & STEPPED outputs; you could do something screwy
with that.


Matt Carpenter wrote:
Show quoted textHide quoted text
>
> Hi,
> What are some ways to achieve pulse-width modulation that results in a
> signal able to act as a clock? I know I can use an NTO to get a nice
> pwm sound and an NCOM to get a clock with variable pulse-width -- is
> there anything else?
>
> Thanks,
> Matt
>
>

Re: PWM / clock

2008-09-12 by matthew carpenter

Thanks, John! I hadn't thought of using the bottom section of the VCM or the SSGs CUPL output.
I've tried doing this with the VC Clock and DTG (I have one with rise/both/fall switch) but in all cases, it seems like I'm modulating the frequency, and not the duty-cycle, or if I am modulating the duty cycle, I'm also modulating the frequency.
Show quoted textHide quoted text
On 9/12/08, John P <johnp299792@...> wrote:

Any comparator will do it, not just ncom. Also the DSG and some of its
cousins, setting the VC switch to RISE or FALL will modulate the duty
cycle of the GATE pulse wave. OUT 2 of the VCM bottom section delivers
pulse waves that can be modulated by VC or the knob. And the SSG CUPL
output compares SMOOTH & STEPPED outputs; you could do something screwy
with that.

Matt Carpenter wrote:
>
> Hi,
> What are some ways to achieve pulse-width modulation that results in a
> signal able to act as a clock? I know I can use an NTO to get a nice
> pwm sound and an NCOM to get a clock with variable pulse-width -- is
> there anything else?
>
> Thanks,
> Matt
>
>


Re: can TKB sequence my EMS SYnthi AKS

2008-09-12 by Bakis Sirros

wow, that's great!
it should work fine. i guess, and with also it should work any other analogue sequencer.
thanks Ross for bringing this to my attention!
i have to buy one, asap!


Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
[Doepfer_a100] group owner
www. parallel - worlds - music. com
www. myspace. com/ parallelworldsmusic
www. myspace. com/ interconnectedmusic
www. myspace. com/ memorygeist
www. DiN. org. uk
www. musicamaximamagnetica. com
www. shimarecords. co. uk
www. rubberrecords. gr
Athens - Greece

--- On Fri, 9/12/08, amnesia <amni56@...> wrote:
From: amnesia <amni56@...>
Subject: Re: [SergeModular] can TKB sequence my EMS SYnthi AKS
To: SergeModular@yahoogroups.com
Date: Friday, September 12, 2008, 2:22 PM


Re: PWM / clock

2008-09-12 by Matt Carpenter

Ok, I've just been informed off-list that I need to trigger one DTG or
DUSG half with another in order to achieve this result. One half sets
the base rate and the other, the gate length.
Show quoted textHide quoted text
> On 9/12/08, John P <johnp299792@...> wrote:
> >
> > Also the DSG and some of its
> > cousins, setting the VC switch to RISE or FALL will modulate the duty
> > cycle of the GATE pulse wave.
> >
>

Re: PWM / clock

2008-09-13 by John P

No, you patch it to self-cycle like always. Select VC control of RISE
or FALL but not both. Then modulate the frequency with an external CV.
If RISE is selected, only the rise time will be modulated. The fall
time will be constant. Therefore, as frequency goes up, duty cycle will
change. Maybe not the PWM you were after, but it's PWM.

Matt Carpenter wrote:
Show quoted textHide quoted text
>
> Ok, I've just been informed off-list that I need to trigger one DTG or
> DUSG half with another in order to achieve this result. One half sets
> the base rate and the other, the gate length.
>
> > On 9/12/08, John P <johnp299792@...> wrote:
> > >
> > > Also the DSG and some of its
> > > cousins, setting the VC switch to RISE or FALL will modulate the duty
> > > cycle of the GATE pulse wave.
> > >
> >
>
> __._,_._

Re: PWM / clock

2008-09-13 by matthew carpenter

"This is not the PWM you're looking for".

Ok, thanks!
Show quoted textHide quoted text
On Fri, Sep 12, 2008 at 11:05 PM, John P <johnp299792@...> wrote:

No, you patch it to self-cycle like always. Select VC control of RISE
or FALL but not both. Then modulate the frequency with an external CV.
If RISE is selected, only the rise time will be modulated. The fall
time will be constant. Therefore, as frequency goes up, duty cycle will
change. Maybe not the PWM you were after, but it's PWM.

Matt Carpenter wrote:
>
> Ok, I've just been informed off-list that I need to trigger one DTG or
> DUSG half with another in order to achieve this result. One half sets
> the base rate and the other, the gate length.
>
> > On 9/12/08, John P <johnp299792@...> wrote:
> > >
> > > Also the DSG and some of its
> > > cousins, setting the VC switch to RISE or FALL will modulate the duty
> > > cycle of the GATE pulse wave.
> > >
> >
>
> __._,_._


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