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 Forum index » DIY Hardware and Software
Jim Patchell's Vocal Filter
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zthee



Joined: Feb 20, 2008
Posts: 414
Location: Stockholm

PostPosted: Wed Mar 18, 2009 8:01 am    Post subject: Reply with quote  Mark this post and the followings unread

Aha, BP1 means Break Point 1 ! That kinda threw me off, thinking - why does he have like 24 band pass filters Wink
But now I get it!

Looks great!
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fonik



Joined: Jun 07, 2006
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Location: Germany
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PostPosted: Thu Mar 19, 2009 6:32 am    Post subject: Reply with quote  Mark this post and the followings unread

there is one thing i am still not sure about. it is the wiring of the shapers gain potentiometers: as i understand it now for each shaper the summed vowel CVs are fed into the negative input of an OpAmp, whereas the positive input is fed by the vowel CVs that went through a potentiometer. The Opamp will compare and cancel out the original CVs!? the output of the OpAmp is mixed with the shaped CV anyways, so how could this influence the gain of the shaper?
i am still not sure, just because i don't understand it, and i don't see the connection from the pot to the vowel CVs for two of the gain potentiometers.

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andrewF



Joined: Dec 29, 2006
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Location: australia
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PostPosted: Thu Mar 19, 2009 8:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Vowel Out, pin15 of JP5 connects to all 3 Master Gain pots, although only one connection is shown.
are these the 2 gain pots you are unsure of?
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fonik



Joined: Jun 07, 2006
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PostPosted: Thu Mar 19, 2009 8:21 am    Post subject: Reply with quote  Mark this post and the followings unread

exactly. so i am right about the connection - i still don't understnd the gain functionality...
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andrewF



Joined: Dec 29, 2006
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PostPosted: Thu Mar 19, 2009 3:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

you are right, the gain pots are dividing the CV signal and feeding it to the inv inputs.
Originally I had assumed they were differential amp stages with adjustable gain, but now after your question and a closer look, not so sure Question
Maybe it is worth setting one of these stages up in Pspice or on a breadboard to see how it works.
Or contact Jim, for the definitive answer.
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knarleybass



Joined: Mar 22, 2009
Posts: 8
Location: Los Angeles

PostPosted: Sun Mar 22, 2009 2:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

it's one crazy filter, I built one about 5 years ago.
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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Mar 23, 2009 4:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

knarleybass wrote:
it's one crazy filter, I built one about 5 years ago.

so you like it? i hope it is worth the effort. would it be insolent to ask you for some sound samples?

i found a little company that will print on a front panel i send them. i ordered the cabinet and will then send them the panel to print my graphics on (one color/black). it will cost less than a schaeffer panel, i will have to do all the drilling, though.

VocalFilter_panel2

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matthias
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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Mar 23, 2009 4:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

if you wonder about the CV/potentiometer combination on the break points: i plan to wire the jacks normalled to the +10V reference. this way i could use the pot as manual control with no CV plugged in. as soon as the CV in socket is used, the pot would work as attenuator...
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knarleybass



Joined: Mar 22, 2009
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Location: Los Angeles

PostPosted: Mon Mar 23, 2009 4:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

sadly, where I live now I don't have room for my modular, it's in storage.
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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Mar 24, 2009 2:15 am    Post subject: Reply with quote  Mark this post and the followings unread

knarleybass wrote:
sadly, where I live now I don't have room for my modular, it's in storage.

a real pitty, isn't it? great work, knarleybass.

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knarleybass



Joined: Mar 22, 2009
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PostPosted: Wed Mar 25, 2009 11:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Someday I will get it out again.
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ach_gott



Joined: Sep 09, 2008
Posts: 79
Location: Chicago

PostPosted: Wed Mar 25, 2009 12:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

knarleybass wrote:
Someday I will get it out again.


If you ever decide you don't want to store it anymore, drop me a PM. I'll still build one though... more vocal sounds! babble
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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Mar 30, 2009 1:12 am    Post subject: Reply with quote  Mark this post and the followings unread

some progress here. now i am waiting for the frontpanel...

Vocal Filter waiting for the front panel

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andrewF



Joined: Dec 29, 2006
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PostPosted: Mon Mar 30, 2009 1:32 am    Post subject: Reply with quote  Mark this post and the followings unread

lookin' good
*just* the wiring to go

Very Happy Very Happy Wink
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knarleybass



Joined: Mar 22, 2009
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PostPosted: Mon Mar 30, 2009 1:42 am    Post subject: Reply with quote  Mark this post and the followings unread

it is going to be amazing!
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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Mar 30, 2009 1:44 am    Post subject: Reply with quote  Mark this post and the followings unread

i am Klee2-proven. so no concerns on my side Laughing

or at least no big concerns.

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matthias
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TekniK



Joined: Aug 10, 2008
Posts: 1059

PostPosted: Mon Mar 30, 2009 4:11 am    Post subject: Reply with quote  Mark this post and the followings unread

andrewF wrote:
lookin' good
*just* the wiring to go

Very Happy Very Happy Wink


yes,and from then he can post his own demo's cheesy
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Apr 03, 2009 3:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

the frontpanel arrived today. the result is amazing, IMHO at least. actually i am a littlebit overwhelmed and i must show it to you, even though i still have to drill the holes. Without the holes it ahs been less than a schaeffer panel. i will ahve to contact the company about the drilling (what do they need, how does it fit with the print (offset tolerances).

a little bit blurry, sorry:
Vocal Filter Frontpanel

close-up:
Vocal Filter Frontpanel close-up

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matthias
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Sine



Joined: Sep 10, 2007
Posts: 111
Location: Netherlands

PostPosted: Fri Apr 03, 2009 3:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very nice fonik !

Now the trick is to drill it without damaging the print.
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Apr 03, 2009 3:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

the "printing" is actually black anodized. i drilled black anodized panels before without any issues!?
do you have some experiences with this kind of print and drilling? what should i be aware of? i wanted to start tomorrow...

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TekniK



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PostPosted: Fri Apr 03, 2009 4:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
what should i be aware of? i wanted to start tomorrow...


noting,just drill

seriously
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zthee



Joined: Feb 20, 2008
Posts: 414
Location: Stockholm

PostPosted: Sat Apr 04, 2009 9:25 am    Post subject: Reply with quote  Mark this post and the followings unread

Looks awesome!

Happy drilling!

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knarleybass



Joined: Mar 22, 2009
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PostPosted: Wed May 06, 2009 1:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

I can't wait to see more progress on your filter.
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fonik



Joined: Jun 07, 2006
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PostPosted: Wed May 06, 2009 1:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

me too Laughing

i mounted all front panel components and made the ground star configuration. this all goes alongside with my other projects. i hope it will be finished end of month for the german modular meeting.

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ryktnk



Joined: Apr 24, 2008
Posts: 284
Location: london
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PostPosted: Wed May 06, 2009 1:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

hello

That's a great design for your panel, very cool

Do you mind me asking who made it ?
Is it not Schaeffer ?

Thanks

-ryk
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