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Gate Sequencer - 12 steps?

Gate Sequencer - 12 steps?

2006-11-07 by Andrew Scheidler

Is there a (somewhat reasonably straightforward) way to build the Gate Sequencer so that it has 12 steps instead of 8 ?

I realize you could build two of them, then link them together to get 16, but short of doing that, is there any possibility?

Andrew

Re: Gate Sequencer - 12 steps?

2006-11-07 by John Mahoney

At 03:37 PM 11/7/2006, Andrew Scheidler wrote:
Show quoted textHide quoted text
>Is there a (somewhat reasonably straightforward) way to build the
>Gate Sequencer so that it has 12 steps instead of 8 ?
>
>I realize you could build two of them, then link them together to
>get 16, but short of doing that, is there any possibility?
>
>Andrew

I'd say "no way", since it's based on a 10-stage device, the CD4017.
--
john

Re: Gate Sequencer - 12 steps?

2006-11-07 by Andrew Scheidler

Yeah, with 3 bits making 8 steps... is there a substitutable device that can count higher?

Also, I'm looking at using LED lighted pushbuttons (instead of mechanical switches) on my GS, and they require 3volts to power the LED. Is there a place in the existing GS circuit where the 3v would be available to pull from?

Andrew
Show quoted textHide quoted text
>>> John Mahoney <jmahoney@...> 11/07/06 4:56 PM >>>
At 03:37 PM 11/7/2006, Andrew Scheidler wrote:
>Is there a (somewhat reasonably straightforward) way to build the
>Gate Sequencer so that it has 12 steps instead of 8 ?
>
>I realize you could build two of them, then link them together to
>get 16, but short of doing that, is there any possibility?
>
>Andrew

I'd say "no way", since it's based on a 10-stage device, the CD4017.
--
john

Re: Gate Sequencer - 12 steps?

2006-11-07 by Jason Proctor

3 bits? i think that's the sequential switch module. the gate
sequencer is straight 4017 johnson.

easiest way of getting >8 steps is to hide two gate sequencer PCBs
behind 1 panel. 1 big panel will probably only be 1.5x the cost of 2
smaller ones, and the PCB itself is *cheap* to populate.

hth
Show quoted textHide quoted text
>Yeah, with 3 bits making 8 steps... is there a substitutable device
>that can count higher?
>
>Also, I'm looking at using LED lighted pushbuttons (instead of
>mechanical switches) on my GS, and they require 3volts to power the
>LED. Is there a place in the existing GS circuit where the 3v would
>be available to pull from?
>
>Andrew
>
> >>> Jo

Re: Gate Sequencer - 12 steps?

2006-11-07 by John Mahoney

At 05:06 PM 11/7/2006, Andrew Scheidler wrote:
Show quoted textHide quoted text
>Yeah, with 3 bits making 8 steps... is there a substitutable device
>that can count higher?

Well, Ray Wilson's got a 16-step sequencer:
http://www.musicfromouterspace.com/analogsynth/SEQ16_2005/SEQ16_2005.html

Thomas Henry's SuperSeque used a 4-bit up/down counter, the CD4516,
and a 4-bit decoder, the CD4514. You can still find those ICs.

The SuperSeque plans were published in Polyphony, which tells you how
old the design is. :-) There was no PCB layout; Thomas said that he
used point-to-point wiring. (I actually have the old magazines, but
I'd need some time to find the right issues. It was a 2-part article
and some errata could have been published in a later issue.)
--
john

Re: Gate Sequencer - 12 steps?

2006-11-07 by John Mahoney

At 05:22 PM 11/7/2006, you wrote:
>easiest way of getting >8 steps is to hide two gate sequencer PCBs
>behind 1 panel. 1 big panel will probably only be 1.5x the cost of 2
>smaller ones, and the PCB itself is *cheap* to populate.

Yeah, but you also need extra logic to chain them together. It's not
rocket science, but it means another board, not to mention more time
at the breadboard.
--
john

Re: Gate Sequencer - 12 steps?

2006-11-07 by sasami@hotkey.net.au

>Is there a (somewhat reasonably straightforward) way to build the Gate
Sequencer so that it has 12 steps instead of 8 ?
>
>I realize you could build two of them, then link them together to get 16,
but short of doing that, is there any possibility?

Building and cascading two is the only way of doing it with this circuit.

Ken
_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Re: Gate Sequencer - 12 steps?

2006-11-07 by sasami@hotkey.net.au

>Yeah, but you also need extra logic to chain them together. It's not
>rocket science, but it means another board, not to mention more time
>at the breadboard.

Go read the article again. There is no need of extra logic. The thing is
DESIGNED to cascade.

Ken
_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Re: Gate Sequencer - 12 steps?

2006-11-08 by John Mahoney

At 05:56 PM 11/7/2006, you wrote:

> >Yeah, but you also need extra logic to chain them together. It's not
> >rocket science, but it means another board, not to mention more time
> >at the breadboard.
>
>Go read the article again. There is no need of extra logic. The thing is
>DESIGNED to cascade.

Oh! [blush] I'll need to *read* that article. I just assumed that it
was a typical 4017-based sequencer.

As Jason suggested, then. :-)
--
john

Re: Gate Sequencer - 12 steps?

2006-11-08 by scottnoanh@peoplepc.com

> Oh! [blush] I'll need to *read* that article. I just assumed that it
> was a typical 4017-based sequencer.

Typical? Sir, this is the CGS list. Drop and give me 20.

=0)

Cheers,
Scott

Re: Gate Sequencer - 12 steps?

2006-11-08 by John Mahoney

At 11:05 PM 11/7/2006, scottnoanh@... wrote:
Show quoted textHide quoted text
> > Oh! [blush] I'll need to *read* that article. I just assumed that it
> > was a typical 4017-based sequencer.
>
>Typical? Sir, this is the CGS list. Drop and give me 20.

Well, I had assumed that "expandable" meant that you could add
multiple *rows* -- not columns. And then there's Ken's own
description of the Gate Sequencer CV Adapter:

The CV Adapter is an addition to the Gate Sequencer
converting it to a traditional eight-step control voltage sequencer.

It simply adds a single channel no-nonsense 8 step analog output. ...

See? Even that says "traditional"! :-) Anyway...

It's not clear to me how the clock control is supposed to be
cascaded. Fine, you can simply connect the outputs together, but how
is the chaining handled? Well, maybe the answer is in there, but I'm
too tired to read it carefully right now.

One. Two. Three. Four...
--
john

Re: Gate Sequencer - 12 steps?

2006-11-08 by Jason Proctor

the paragraph beginning "When the Loop/Hold switch is set to "Hold""
has all the goodies :-)
Show quoted textHide quoted text
>At 11:05 PM 11/7/2006, scottnoanh@... wrote:
>> > Oh! [blush] I'll need to *read* that article. I just assumed that it
>> > was a typical 4017-based sequencer.
>>
>>Typical? Sir, this is the CGS list. Drop and give me 20.
>
>Well, I had assumed that "expandable" meant that you could add
>multiple *rows* -- not columns. And then there's Ken's own
>description of the Gate Sequencer CV Adapter:
>
> The CV Adapter is an addition to the Gate Sequencer
>converting it to a traditional eight-step control voltage sequencer.
>
> It simply adds a single channel no-nonsense 8 step analog output. ...
>
>See? Even that says "traditional"! :-) Anyway...
>
>It's not clear to me how the clock control is supposed to be
>cascaded. Fine, you can simply connect the outputs together, but how
>is the chaining handled? Well, maybe the answer is in there, but I'm
>too tired to read it carefully right now.
>
>One. Two. Three. Four...
>--
>john

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