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StephenGiles
Joined: Apr 17, 2006 Posts: 507 Location: England
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Posted: Sun Jan 07, 2007 6:11 am Post subject:
Barberpole Phaser |
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Could this be offered as a project for someone to put together for 2007? Apart from the Boss PH3, which uses 100+ pin chips, I have never seen a complete circuit diagram from a working unit. I have seen bits of the whole, like the Shepherd Generator in Polyphony all those years ago, so how about it?? I would add that when sunbathing at beach bar just outside Alicante in Spain on New Year's Eve I gave this some thought whilst having a cafesito! |
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
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Posted: Sun Jan 07, 2007 2:27 pm Post subject:
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The reason I imagine, you've never seen one here or elsewhere is probably because the actual design of such a circuit would be a rather time consuming act (as well as highly expensive) to follow.
Essentially you'd need a quadratic sinewave oscillator with each phase out patched to a individual phase circuit, but then somehow you would have to mask the modulation signal while it was falling, and that would require some VCA's
Have you got a Nord Micromodular? I once made a barberpole phaser for the Nord, it worked very well.
I do believe that Doepfer or Analogue Systems once made a sheppard generator for commercial purchase some time ago. It was quite pricey if I remember? Can you dig up the design from Polyphony Mag at all? (Remember not to post it here, unless you have got permission from Paia!).
The best bet I reckon, would be to build Scott's vactrol phaser project and experiment with that. The AD633 too can be utilised as a quadratic oscillator (and perhaps next time, while you are lying on a nice beach getting a suntan you could devise a circuit to add here?- you cheeky monkey! ) |
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StephenGiles
Joined: Apr 17, 2006 Posts: 507 Location: England
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Posted: Sun Jan 07, 2007 2:39 pm Post subject:
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Thanks for the reply. The main reason for our trip to Spain was to visit my sister in law who had a brain tumour removed in November, but as the sun happened to be shining in the morning...............well, a walk to the beach seemed in order! |
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
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Posted: Sun Jan 07, 2007 2:46 pm Post subject:
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.... and on years day, here back in Blighty, it was pissing down and freezing cold! |
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ian-s
Joined: Apr 01, 2004 Posts: 2669 Location: Auckland, New Zealand
Audio files: 42
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
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Posted: Sun Jan 07, 2007 2:57 pm Post subject:
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A frequency shifter project would be more welcome I think- and easier to build/ design I reckon.
But again, it's best to see what comes up. It more exciting that way, imo. I think it would get rather stupid here if E-M would just become an online version of Funkyjunk. |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
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Posted: Sun Jan 07, 2007 3:35 pm Post subject:
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Well there you go
Thanks for the link. |
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
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Posted: Sun Jan 07, 2007 3:58 pm Post subject:
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And what a nice frequency shifter too!
Shame there is no PCB............
Henry? |
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StephenGiles
Joined: Apr 17, 2006 Posts: 507 Location: England
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Posted: Mon Jan 08, 2007 1:54 pm Post subject:
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g2ian wrote: | One way to get barberpole phasing is to put a couple of all pass filters (standard phaser blocks) in the feedback path of a frequency shifter.
As shown in this demo patch that works with the free G2 demo.
Of cause a frequency shifter is not a trivial DIY project but I think there is at least one on the net. And it is useful for other effects as well. |
What do I play this sample in please? |
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ian-s
Joined: Apr 01, 2004 Posts: 2669 Location: Auckland, New Zealand
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Posted: Mon Jan 08, 2007 2:03 pm Post subject:
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StephenGiles wrote: | g2ian wrote: | One way to get barberpole phasing is to put a couple of all pass filters (standard phaser blocks) in the feedback path of a frequency shifter.
As shown in this demo patch that works with the free G2 demo.
Of cause a frequency shifter is not a trivial DIY project but I think there is at least one on the net. And it is useful for other effects as well. |
What do I play this sample in please? |
The Nord Modular g2 Demo software here (bottom right) |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
G2 patch files: 1
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Posted: Mon Jan 08, 2007 5:29 pm Post subject:
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Quote: | Shame there is no PCB............
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I began work on a board for the Thru- Zero VCO early last year, it's about 80% done, haven't messed with it in a while as I got a new computer and i can't run the old software in Windows XP... [looking for a new layout program]
Both Ken Stone and J. Haible have dome filter board layouts... Haible has a Freq shifter of his own...
The multiplier board will be easy.
perhaps i will get to it- or... just build it on radio shack perf board. Not so pretty- but oh so easy.
josh |
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Funky40
Joined: Sep 24, 2005 Posts: 875 Location: Swiss
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
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Posted: Tue Jan 09, 2007 3:41 am Post subject:
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woah!! AD633's AND a PCB layout????
Funky, can you put this in the links section?? |
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andrewF
Joined: Dec 29, 2006 Posts: 1176 Location: australia
Audio files: 4
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Posted: Tue Jan 09, 2007 7:04 am Post subject:
freq shifter |
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Electronotes has some good freq shifter designs, which is also included in the cheaper 'Preferred circuits' edition.
maybe there is a barberpole phaser in there too??, I remember some article about it.
I made a frequency shifter panel a few years ago, Core circuit was Electronotes FS, 3 CGS dome filters, 4 JH ring mods, 2 passive ring mods, CGS VCO.
Also included a modded 'Lissajous Pattern Generator' from a 70's Silicon Chip mag, strangely similar to the 'oscillograph' of another thread, I had some hopes of being able to get interesting effects by having adjustable phase and amplitude on the sine/cosine outputs - No, it is good on the scope tho.
pics here -
http://www.sdiy.org/pinky/frqshif%20004a.jpg
http://www.sdiy.org/pinky/frqshif%20003a.jpg
Andrew |
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Funky40
Joined: Sep 24, 2005 Posts: 875 Location: Swiss
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Posted: Tue Jan 09, 2007 9:36 am Post subject:
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v-un-v wrote: | Funky, can you put this in the links section?? |
ok, it's done (hopfully done right )
But is i understand this Project one has to bring the PCB Parts by his own together. |
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