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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Wed Dec 10, 2008 6:37 am Post subject:
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Stavros wrote: | Hi Jurgen,
thank you for your fast reply.
Could you please give me some hint also for the second part of my question?
..."Considering either a passive or active summing on one or two outputs as suggested, these outputs could(?) or should(?) then be different from the normal output of the Unit?. Is my assumption correct?"
Many thanks again
Best Regards
Stavros |
Yes. The normal outputs are part of the resonance feedback loop, so I wouldn't change anything there.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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2thick4uni
Joined: Feb 20, 2009 Posts: 113 Location: UK
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Posted: Mon May 04, 2009 3:39 pm Post subject:
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I'm just starting to wire up my String Filter, the extended edition with 40 of 10K log sliders - just wondering if it would be possible to sum 20 of the sliders (each with wiper fitted with 51K resistor) to pin 6 of U7B and the other 20 to Pin 6 of U10B? I would have a switch so that I could switch out all of the feeds from the partials 1-4 that are normally summed to these IC's. This would allow me to keep stereo spread function with slider eq function switched in instead of the feed from partials. It would mean that I didn't have to construct a separate output stage for sliders. I'd guess that I could alter R40 and R67 to alter the gain to keep it at the correct level it would have if the partials were fed through it.
It would have implications on the resonance circuit in that the resonance level of each band would be determined by the slider position; however I'd have thought that this would be a good thing?
Thanks,
Allan |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Tue May 05, 2009 11:16 am Post subject:
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2thick4uni wrote: | I'm just starting to wire up my String Filter, the extended edition with 40 of 10K log sliders - just wondering if it would be possible to sum 20 of the sliders (each with wiper fitted with 51K resistor) to pin 6 of U7B and the other 20 to Pin 6 of U10B? I would have a switch so that I could switch out all of the feeds from the partials 1-4 that are normally summed to these IC's. This would allow me to keep stereo spread function with slider eq function switched in instead of the feed from partials. It would mean that I didn't have to construct a separate output stage for sliders. I'd guess that I could alter R40 and R67 to alter the gain to keep it at the correct level it would have if the partials were fed through it. |
Yes.
Quote: | It would have implications on the resonance circuit in that the resonance level of each band would be determined by the slider position; |
Exactly.
Quote: |
however I'd have thought that this would be a good thing?
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Maybe; maybe not.
Try it, and let us all know!
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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2thick4uni
Joined: Feb 20, 2009 Posts: 113 Location: UK
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Posted: Thu May 07, 2009 12:51 am Post subject:
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Many thanks for the advice Jurgen
Parts I've been waiting for have arrived today so I'll get it finished in the next few days. I'll try various output options including taking slider outs to external mixer and report back with my findings and some pix.
Allan |
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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: Tue May 26, 2009 3:13 pm Post subject:
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Going without onboard PSU, there is no need on any Boards for the 2x Tantals ?
Regarding the shielded cables of P1-4:
very straight line i have around 9cm from the Headers to the switches.
ok, without shilding ?
any general suggestions for lenghts ? whats short, whats long ? |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Tue May 26, 2009 11:10 pm Post subject:
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Funky40 wrote: | Going without onboard PSU, there is no need on any Boards for the 2x Tantals ? |
I would put them in.
If you can't get tantals, use ordinary electrolytic caps instead.
Quote: | Regarding the shielded cables of P1-4:
very straight line i have around 9cm from the Headers to the switches.
ok, without shilding ?
any general suggestions for lenghts ? whats short, whats long ? |
This depends on the environment.
If you're far from electromagnetic noise sources (power transformers, switched PSUs, dimmers, you get away with unshielded cables over a longer distance, than when you're in close proximity to such offenders.
What I do is: I try it with unshielded cables, and if there's no problem, I leave it at that. I can always replace tha cable with a shielded one later.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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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: Fri May 29, 2009 7:33 pm Post subject:
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well, i need help:
the Guy is built, and it sounds, but Resonance Pot and CV makes nothing.
I need here please some help. I can't see any Faults.
I have made a little modification:
I wired the output of the Resonance pot to a CV output, over a 1K output Resistor.
The Output of this CV out gives me a minus Voltage when the Resonance pot is turned to CCW, and no Voltage/offset when turned to CW.
I love that sound and regret allready that i have not brought out the Partials to some additional Ouput Jacks. |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Sat May 30, 2009 1:12 am Post subject:
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Funky40 wrote: | well, i need help:
the Guy is built, and it sounds, but Resonance Pot and CV makes nothing.
I need here please some help. I can't see any Faults.
I have made a little modification:
I wired the output of the Resonance pot to a CV output, over a 1K output Resistor.
The Output of this CV out gives me a minus Voltage when the Resonance pot is turned to CCW, and no Voltage/offset when turned to CW.
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The -15V (ccw) to 0V (cw) on the pot is right. (See http://www.jhaible.de/string_filter/jh_string_filter_sch.pdf)
Try different settings of R17, and then turn the Resonance Pot. There should be regions of R17 where the resonance pot does nothing, and a region where it works. (R17 has a rather wide range to compensate the Vbe differences between unselected transistors in the expo converter.)
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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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: Wed Jun 03, 2009 7:59 am Post subject:
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jhaible wrote: |
Try different settings of R17, and then turn the Resonance Pot. There should be regions of R17 where the resonance pot does nothing, and a region where it works. (R17 has a rather wide range to compensate the Vbe differences between unselected transistors in the expo converter.)
JH. |
I tryed again, different settings of R17, but can't hear any changes when turning the Reso Pot or Modulating over the CV input.
I have a CV out for the Reso pot, going over a 1K resistor.
That works fine, should not change anything i think.
( makes a nice CV source to speed down VCOs btw. )
thanks Jürgen |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Wed Jun 03, 2009 1:33 pm Post subject:
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Funky40 wrote: | jhaible wrote: |
Try different settings of R17, and then turn the Resonance Pot. There should be regions of R17 where the resonance pot does nothing, and a region where it works. (R17 has a rather wide range to compensate the Vbe differences between unselected transistors in the expo converter.)
JH. |
I tryed again, different settings of R17, but can't hear any changes when turning the Reso Pot or Modulating over the CV input.
I have a CV out for the Reso pot, going over a 1K resistor.
That works fine, should not change anything i think.
( makes a nice CV source to speed down VCOs btw. )
thanks Jürgen |
First thing to check would be if the VCA (U3 and U4A in http://www.jhaible.de/string_filter/jh_string_filter_sch.pdf) works.
Unfortunately (for testing), that VCA carries *two* signals, not one. So for testing it, you should temporarily remove R9 (or C6, whatever is easier). Then feed a signal to the Input connector (or R7), probe Pin 1 of U4, and see if you can change the amplitude with the Resonance Pot.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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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: Sat Jun 06, 2009 11:52 pm Post subject:
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jhaible wrote: |
First thing to check would be if the VCA (U3 and U4A in http://www.jhaible.de/string_filter/jh_string_filter_sch.pdf) works.
Unfortunately (for testing), that VCA carries *two* signals, not one. So for testing it, you should temporarily remove R9 (or C6, whatever is easier). Then feed a signal to the Input connector (or R7), probe Pin 1 of U4, and see if you can change the amplitude with the Resonance Pot.
JH. |
I followed your Instructions:
No, no change of amplitude at Pin1/U4
second: how do i best calibrate the Bands ? Thats still to do
I thought i take a Sawwave and check the Frequenzys with Wavelab in the PC |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Sun Jun 14, 2009 9:55 am Post subject:
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Funky40 wrote: | jhaible wrote: |
First thing to check would be if the VCA (U3 and U4A in http://www.jhaible.de/string_filter/jh_string_filter_sch.pdf) works.
Unfortunately (for testing), that VCA carries *two* signals, not one. So for testing it, you should temporarily remove R9 (or C6, whatever is easier). Then feed a signal to the Input connector (or R7), probe Pin 1 of U4, and see if you can change the amplitude with the Resonance Pot.
JH. |
I followed your Instructions:
No, no change of amplitude at Pin1/U4
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Does the DC voltage at pin 2 and pin 3 of U4 change when you turn the Rosonance pot?
Quote: |
second: how do i best calibrate the Bands ? Thats still to do
I thought i take a Sawwave and check the Frequenzys with Wavelab in the PC |
You need Sine waves, not Saw waves.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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Stavros
Joined: Oct 30, 2007 Posts: 36 Location: Athens-Greece
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Posted: Thu Sep 10, 2009 11:27 am Post subject:
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Hi Jurgen,
i have a couple of questions on the Strings Filter please. I apologize before hand should these have been asked and answered already.
1. Trimmer R13 LG, what is it for and how should it be calibrated/set? Also Trimmer R17.
2. Should bipolar electrolytic caps be used at the output like in the “Tau Phaser” or not?
Many thanks in advance
Stavros |
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Stavros
Joined: Oct 30, 2007 Posts: 36 Location: Athens-Greece
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Posted: Sat Sep 12, 2009 2:13 am Post subject:
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Hello Jurgen,
with reference my September 10th two questions, please disregard the second one as I have found the answer myself. "You have that already built onto the PCB".
I will appreciate your reply on my first question. Many thanks in advance
With friendly Greetings
Stavros |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Sat Sep 12, 2009 3:24 am Post subject:
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Stavros wrote: | Hello Jurgen,
with reference my September 10th two questions, please disregard the second one as I have found the answer myself. "You have that already built onto the PCB".
I will appreciate your reply on my first question. Many thanks in advance
With friendly Greetings
Stavros |
I haven't forgotten. I think I have answered it before, but I will look it up for you - probably looking for my previous answer in this thread, too, instead of figuring it out again myself. Just give me some time - of maybe you're even faster looking it up yourself.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Sat Sep 12, 2009 1:35 pm Post subject:
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Stavros wrote: | Hi Jurgen,
i have a couple of questions on the Strings Filter please. I apologize before hand should these have been asked and answered already.
1. Trimmer R13 LG, what is it for and how should it be calibrated/set? Also Trimmer R17.
2. Should bipolar electrolytic caps be used at the output like in the “Tau Phaser” or not?
Many thanks in advance
Stavros |
R13 is "Loop Gain" - set the maximum resonance here, to your taste (self-oscillation, or just no self oscillation)
R17 will set the bias point for the Resonance Potentiometer.
Set the maximum Resonance with R13, and set R17 such that the Resonance front panel pot evenly changes resonance from ccw to cw end position without a dead spot.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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TekniK
Joined: Aug 10, 2008 Posts: 1059
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Posted: Sun Oct 11, 2009 11:20 am Post subject:
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Synthesis of animals with JH string filter,same patch for both animals,only the waveform is different. |
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TekniK
Joined: Aug 10, 2008 Posts: 1059
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Fri Feb 04, 2011 2:34 pm Post subject:
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... and my String Filter prototype goes to ebay as well:
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=160541758356
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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thermionicjunky
Joined: Dec 07, 2006 Posts: 90 Location: san francisco
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Posted: Sun Oct 06, 2013 8:21 am Post subject:
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FYI, I very recently completed my String Filter using an SSM2210 for the VC resonance. I found that couldn't get the parameter to operate correctly. I replaced the SSM2210 with a MAT12 and it works as expected. So, for those of you planning to build this, definitely socket the matched transistor and don't give up if the resonance doesn't seem right. This circuit is a beauty. |
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The Bad Producer
Joined: Mar 08, 2009 Posts: 282 Location: The Manhole
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Posted: Tue Oct 08, 2013 2:14 am Post subject:
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Hi thermionicjunky, Just wondering in what way it didn't work? It would resonate? I've just finished another one and noticed the Res trimmer has quite an interesting response, seemed to only dial in to what i thought 'correct' within a small range _________________ http://loudestwarning.tumblr.com/ |
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thermionicjunky
Joined: Dec 07, 2006 Posts: 90 Location: san francisco
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Posted: Tue Oct 08, 2013 7:48 am Post subject:
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The Bad Producer wrote: | Hi thermionicjunky, Just wondering in what way it didn't work? It would resonate? I've just finished another one and noticed the Res trimmer has quite an interesting response, seemed to only dial in to what i thought 'correct' within a small range |
Yes, the problem was similar to that. In fact, it seemed like a static knob setting allowed me to trim the circuit for a great-sounding resonance level. Turning the knob CW led to a narrow range of resonant white noise, then to a sound duller than the original position. I could trim the CV response to move this position around and I could use the loop gain trimmer to control oscillation but I could not get a smooth transition from minimum to maximum resonance. After sleeping I remembered that I had some MAT12, popped those in and was immediately able to obtain a smooth transition with no noise. It went from not at all correct to ideal with the exchange of transistor pairs. Last edited by thermionicjunky on Tue Oct 20, 2015 7:59 am; edited 1 time in total |
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The Bad Producer
Joined: Mar 08, 2009 Posts: 282 Location: The Manhole
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Posted: Tue Oct 08, 2013 12:20 pm Post subject:
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I'd be interested to hear a sample of how yours sounds, as I'm not sure if mine is right!
I'll try and record something on mine too, tho our internet seems to have reverted to a mid-90's dial up speed for some reason, I'll try and get that up as soon as I can! _________________ http://loudestwarning.tumblr.com/ |
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thermionicjunky
Joined: Dec 07, 2006 Posts: 90 Location: san francisco
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Posted: Wed Oct 09, 2013 8:31 am Post subject:
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The Bad Producer wrote: | I'd be interested to hear a sample of how yours sounds, as I'm not sure if mine is right!
I'll try and record something on mine too, tho our internet seems to have reverted to a mid-90's dial up speed for some reason, I'll try and get that up as soon as I can! |
Okay, I'll throw something together in the next day or two demonstrating a full rotation of the knob and some CV modulation using a couple of different sound sources. |
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thermionicjunky
Joined: Dec 07, 2006 Posts: 90 Location: san francisco
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