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Argitoth
Joined: Jun 24, 2008 Posts: 152 Location: Gilbert, Arizona
Audio files: 3
G2 patch files: 6
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Posted: Tue Aug 31, 2010 4:59 pm Post subject:
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HOLY FFFFFFFFFFFFFFFFFFFFF...REAKIN
Bandpass on Mode 2/3 on Output 2/3... 3 different outputs, slightly different characters... 3 outs x 4 modes = 12 variations...
FAVORITE BEST FILTER EVER IN THE UNIVERSE!!!!!!!!!!!!!!! WOOOOHOOOO!!
audio demos coming soon. |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Tue Aug 31, 2010 8:11 pm Post subject:
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Argitoth wrote: | FAVORITE BEST FILTER EVER IN THE UNIVERSE!!!!!!!!!!!!!!! WOOOOHOOOO!!
audio demos coming soon. |
Glad it's working out for you.
Remember to explore all the crazy stuff up above resonance. It's really insane!
Looking forward to the demos -- there are so many ways to use this circuit, I know I've only scratched the surface.
Ian |
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Argitoth
Joined: Jun 24, 2008 Posts: 152 Location: Gilbert, Arizona
Audio files: 3
G2 patch files: 6
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Posted: Tue Aug 31, 2010 10:07 pm Post subject:
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Hmm, I think there is actually a bit of a problem. Turning the coarse tune to about 3.5 mark and the frequency cv to 10, and using a MOTM-800 to control the filter, there's not enough control voltage to hear anything (when in lowpass mode). So I'm not getting enough DC signal to control the filter. <removed>
Must be a wrong resistor somewhere, right?
EDIT: Checked all resistors, all values seem to be correct.
EDIT: Oh and the Threeler can be used as a limited vc-slew and LFO. sweet! very unique lfo shapes too. Crazy modulation action when feeding back into itself and using an LFO as an input. |
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Argitoth
Joined: Jun 24, 2008 Posts: 152 Location: Gilbert, Arizona
Audio files: 3
G2 patch files: 6
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Argitoth
Joined: Jun 24, 2008 Posts: 152 Location: Gilbert, Arizona
Audio files: 3
G2 patch files: 6
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bridechamber
Joined: Oct 06, 2007 Posts: 64 Location: Saint Paul, MN
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Posted: Sat Sep 04, 2010 6:05 pm Post subject:
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Fantastic demos Elan!!!!!!!! |
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softfin
Joined: Oct 11, 2006 Posts: 271 Location: Far in the north
Audio files: 1
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Posted: Tue Sep 07, 2010 8:43 am Post subject:
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Argitoth wrote: |
FAVORITE BEST FILTER EVER IN THE UNIVERSE!!!!!!!!!!!!!!! WOOOOHOOOO!!
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Hey, congrats on the succesfull threeler build! It is indeed an awesome module to have! Love mine as well |
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Funky40
Joined: Sep 24, 2005 Posts: 875 Location: Swiss
Audio files: 1
G2 patch files: 5
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Posted: Mon Sep 13, 2010 1:39 am Post subject:
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cool, glad to see you making such very good music.
a friend sent me the file some days ago. so i was surching now for the place it was posted.......
in fact, feedbacks are the reason why EVERY of my Filters have two inputs, usually each with an attenuator.
But it's a long time ago that i patched feedbacks on filters. |
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stijn
Joined: Jul 21, 2008 Posts: 39 Location: utrecht, netherlands
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Posted: Thu Jan 27, 2011 1:10 pm Post subject:
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[quote="machine.cuisine"] frijitz wrote: | Imagine the schematic bent around into a circle. The middle terminals are the A0 and A1 connections. Each of those connects to one of the outer terminals in each switch position. You can tell which ones by looking or by using an ohmmeter. In the first position they contact the terminals labeled "1" in the schematic. In the second position they contact the next pair in the schematic, and so on.
Ian |
Hi there, I'm having some trouble getting my threeler to work
even with this explenation I still can't figure out how to wire the rotary switch. I've hooked up the middle terminals with A0 and A1
A0 contacts terminals 1 2 3 4
A1 contacts terminals 7 8 9 10
I've connected the grnd to terminals 1 2 3 4
and -V to terminals 7 8 9 10
There is a weak signal at all outputs, it's the same at all outputs in all modes. the resonance and cv resonance work.
Is there something wrong in the wireing or should I look elsewhere? |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Thu Jan 27, 2011 2:38 pm Post subject:
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stijn wrote: | I've hooked up the middle terminals with A0 and A1
A0 contacts terminals 1 2 3 4
A1 contacts terminals 7 8 9 10
I've connected the grnd to terminals 1 2 3 4
and -V to terminals 7 8 9 10 |
If I understand what you are saying, then Gnd should go to 1, 3, 5 and 6 and +12V should go to 2, 4, 7 and 8. There is no connection to -12V. (Refer to the schematic.)
Ian |
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stijn
Joined: Jul 21, 2008 Posts: 39 Location: utrecht, netherlands
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Posted: Sun Jan 30, 2011 12:40 am Post subject:
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frijitz wrote: | stijn wrote: | I've hooked up the middle terminals with A0 and A1
A0 contacts terminals 1 2 3 4
A1 contacts terminals 7 8 9 10
I've connected the grnd to terminals 1 2 3 4
and -V to terminals 7 8 9 10 |
If I understand what you are saying, then Gnd should go to 1, 3, 5 and 6 and +12V should go to 2, 4, 7 and 8. There is no connection to -12V. (Refer to the schematic.)
Ian |
tnx for the fast reply Ian!
modes are working now.
next problem is coarse tune and fine tune aren't working. how do I wire the coarse tune pot and where else should I look. |
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stijn
Joined: Jul 21, 2008 Posts: 39 Location: utrecht, netherlands
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Posted: Sun Jan 30, 2011 12:41 am Post subject:
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frijitz wrote: | stijn wrote: | I've hooked up the middle terminals with A0 and A1
A0 contacts terminals 1 2 3 4
A1 contacts terminals 7 8 9 10
I've connected the grnd to terminals 1 2 3 4
and -V to terminals 7 8 9 10 |
If I understand what you are saying, then Gnd should go to 1, 3, 5 and 6 and +12V should go to 2, 4, 7 and 8. There is no connection to -12V. (Refer to the schematic.)
Ian |
tnx for the fast reply Ian!
modes are working now.
next problem is coarse tune and fine tune aren't working. how do I wire the coarse tune pot and where else should I look. |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Sun Jan 30, 2011 5:33 pm Post subject:
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stijn wrote: | how do I wire the coarse tune pot and where else should I look. |
The Coarse tune pot connects to J2, as indicated on the I/O Pinout diagram in the docs. The outside legs connect to pins 1 (V-) and 2 (V+). The middle leg connects to pin 6, labeled "Coarse F".
Please be careful that the pots on the board do not short out. You may need to trim excess metal from the middle terminal or make certain the pots are mounted slightly above the board.
Ian |
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stijn
Joined: Jul 21, 2008 Posts: 39 Location: utrecht, netherlands
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Posted: Tue Feb 01, 2011 11:39 am Post subject:
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tnx Ian.
wireing is ok now and the pots don't touch the pcb but still no working filter.
where to look now? again it seems that the mode swich is working, also resonance and resonance cv is working, but no coarse and fine tune. Also the signal at the outputs is very weak. |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Tue Feb 01, 2011 12:40 pm Post subject:
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stijn wrote: | ...where to look now? again it seems that the mode swich is working, also resonance and resonance cv is working, but no coarse and fine tune. Also the signal at the outputs is very weak. |
Hard to know where to look next. It sounds like more than one problem. Does the filter self-resonate with the resonance turned way up and no input? Can you measure the amplitude of the output signal?
Ian |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Tue Feb 01, 2011 12:45 pm Post subject:
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stijn wrote: | the pots don't touch the pcb... |
Just to make extra sure this is clear. The potential problem is with the middle pins of the pots shorting to the adjacent pads (not the pot body touching the boared or anything like that.)
Ian |
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stijn
Joined: Jul 21, 2008 Posts: 39 Location: utrecht, netherlands
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Posted: Wed Feb 23, 2011 12:27 pm Post subject:
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Hello Ian,
I cannot find the time to properly troubelshoot my threeler at this moment. I'm sure the pots aren't the problem and I found out that I placed a 2k resistor instead of a 2k tempco, I will replace it.
As soon as I have some time I will post my findings. Thanks for your time! |
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stijn
Joined: Jul 21, 2008 Posts: 39 Location: utrecht, netherlands
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Posted: Sun Feb 27, 2011 1:29 pm Post subject:
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oke I got my threeler working!! awesome filter!! but there are still a few things that need attention.
ok first the reason the course tune didn't work was I had nothing installed in the R36 B place. what resistor value should be there? it's not in the building docs.
I still have a problem with the resonance,turning the knob at 1/3th it suddenly flips to very high resonance. what could be the problem? |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Sun Feb 27, 2011 3:48 pm Post subject:
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stijn wrote: | ok first the reason the course tune didn't work was I had nothing installed in the R36 B place. what resistor value should be there? it's not in the building docs. |
Glad you're making progress. There is only one R36. "a" and "b" simply denote alternate mounting positions, depending on which is most convenient for whatever transistor pair you have. "a" is meant for if you use a 2sa798. Otherwise "b" is probably better.
Quote: | I still have a problem with the resonance,turning the knob at 1/3th it suddenly flips to very high resonance. what could be the problem? |
I'm not sure, but it may be OK. Self oscillation turns on quite rapidly. There is lots of control above the resonance onset, since that's where all the wild nonlinear and chaotic behavior is. Remember, this is as much a noisemaker as a filter.
Ian |
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mig27
Joined: Mar 09, 2011 Posts: 21 Location: Berlin
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Posted: Wed Mar 09, 2011 5:04 am Post subject:
Success! |
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Just wanted to report of a successful Threeler build.
The thing worked right away when I fired it up the first time.
What a stellar design!
Easily the best filter in my system.
Just ordered a second PCB.
And to top this, I now have absolutely no more reason to keep my MS20.
No regrets for sure.
Thanks so much for this awesome awesome project.
Michael |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Mar 09, 2011 9:33 am Post subject:
Re: Success! |
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mig27 wrote: | Thanks so much for this awesome awesome project.... |
You're welcome! Glad it's working out OK for you.
Ian |
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mig27
Joined: Mar 09, 2011 Posts: 21 Location: Berlin
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Posted: Sun Mar 13, 2011 5:30 am Post subject:
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I was thinking about modding my threeler to get more serial filter combinations out of it.
Per design it has:
Mode 1: LLL
Mode 2: LLH
Mode 3: LHH
Mode 4: HHH
With 3 dual mode filters, there are 2^3=8 possibilities.
These are the four other possible combinations:
LHL
HLL
HLH
HHL
Now since the filter mode knob only switches 12V on or off, I was planning on replacing it with 3 single through switches, allowing for those 8 possible combinations.
The catch is that I only see two connection points for the switched 12V: A0 and A1.
Can anyone point me to the point where I could insert the third switched 12V? Like the hypothetical A3?
Hope this makes sense..
Thanks!
Michael |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Sun Mar 13, 2011 12:49 pm Post subject:
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mig27 wrote: | I was thinking about modding my threeler to get more serial filter combinations out of it.....
Now since the filter mode knob only switches 12V on or off, I was planning on replacing it with 3 single through switches, allowing for those 8 possible combinations. |
Well, it's not quite that simple, since the circuit actually uses a MUX plus analog switches. If you know what you are doing, you could remove the analog switches and put in three mechanical SPDT switches to get HP/LP for all three sections.
When I was originally working on the design I had a general layout (filter foundry) where I could easily hook up any combination of stages, and I looked at a large number of possibilities. In addition to the HP/LP choices there is also the decision of where to put the nonlinear gain stage in the loop.
If you do what you are thinking of, two of the combinations will not work at all, and the other two will work, but not very well.
Ian |
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mig27
Joined: Mar 09, 2011 Posts: 21 Location: Berlin
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Posted: Wed Mar 16, 2011 7:37 am Post subject:
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Hey Ian,
Thanks for the explanation.
As a matter of fact I know nothing about MUXes and shall better leave everything as it is
Michael |
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Fetafarmer
Joined: Jul 29, 2007 Posts: 32
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