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 Forum index » DIY Hardware and Software » Jürgen Haible designs
String Filter (40 band resonator)
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jhaible



Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24

PostPosted: Sat May 10, 2008 5:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

elektro80 wrote:
Okdokey, I just sent you an email. It will be 2 sets for me. And I´m looking forward to seeing what will be on PCB 3. Very Happy


In the old version, I had 4 parametric filters x3 (for cello, viola and violin), with heaps of trimpots.
For the new version, I'm running the old filters thru a spectrum analyzer (visual analyser freeware, to be precise), and then re-create them with fixed filters (using FilterWiz and PSpice).
The resulting circuit should have less than 15 opamps probably, so I can make it part of my FFF PCB project. Maybe.

JH.

Now playing: Saga, Silent Knight

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"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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Serenadi



Joined: Jul 03, 2007
Posts: 89
Location: Germany

PostPosted: Sat May 10, 2008 11:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

jhaible wrote:
I've just recorded two short demos with the String Filter prototype.


Great, sounds amazing. Especially the arpeggio.

You convinced me. Very Happy
Thanks.
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robotmakers



Joined: Mar 12, 2008
Posts: 7
Location: NY, USA

PostPosted: Mon May 12, 2008 7:35 am    Post subject: Request for assembled string filter module Reply with quote  Mark this post and the followings unread

Is there anyone on this forum (or elsewhere) who would be interested in building me a MOTM or Dotcom compatable String Filter module using JH's circuit boards? Please respond offline.

Thanks very much for your consideration,
Roger
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jhaible



Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24

PostPosted: Tue May 13, 2008 4:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

And yet another demo:

Short OB-8 arpeggiated strings
http://www.jhaible.heim.at/string_filter/jh_string_filter_2008_3.mp3
1. Dry
2. 40-Band Filterbank and Cello-Filter breadboard circuit
3. Dry
4. 40-Band Filterbank only

I've also published the frequency response plots for this now:
http://www.jhaible.heim.at/string_filter/jh_string_filter.html

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

PostPosted: Mon May 19, 2008 3:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

What you're going to build ...

http://www.jhaible.heim.at/string_filter/jh_string_filter_sch.pdf

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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Norman Phay



Joined: Jun 29, 2007
Posts: 173
Location: North-East England
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PostPosted: Tue May 20, 2008 5:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Good grief! I thought I'd printed out an M C Escher artwork for a minute there.
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jhaible



Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24

PostPosted: Tue May 20, 2008 1:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Norman Phay wrote:
Good grief! I thought I'd printed out an M C Escher artwork for a minute there.


Laughing

It's not as bad as it looks.

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

PostPosted: Tue May 20, 2008 3:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

update
I've just placed my order at the PCB factory.

(I've ordered a few spares, too, so don't worry if you haven't placed your order with me yet.)

JH.

Now playing: Edgar Froese, Aqua

_________________
"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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Spratty



Joined: Oct 08, 2007
Posts: 43
Location: Australia

PostPosted: Wed May 21, 2008 4:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Is it possible to run this off an 18VAC powerpack JH?

Spratty Wink
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jhaible



Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24

PostPosted: Wed May 21, 2008 2:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Spratty wrote:
Is it possible to run this off an 18VAC powerpack JH?

Spratty Wink


What is a powerpack?

You can run it from a 2x 16V ... 18V AC transformer, with primary and secondary fuses, and with big heatsinks on the voltage regulators.

Or, alternatively, from +/-15V stabilized DC.

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
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Audio files: 24

PostPosted: Wed May 21, 2008 2:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

BOM (Bill of Materials)

http://www.jhaible.heim.at/string_filter/jh_string_filter_bom.pdf

Updated web site:

http://www.jhaible.heim.at/string_filter/jh_string_filter.html

JH.

Now playing: P. M. Hamel, Bardo

_________________
"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
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Audio files: 24

PostPosted: Mon Jun 02, 2008 11:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

I checked at the factory - production of the String Filter PCBs has now started!

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: 27
Location: Athens-Greece

PostPosted: Wed Jun 11, 2008 2:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello,

on the BOM list should VTL3C3 rather be VTL5C3?

Thanks

Stavros
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jhaible



Joined: May 25, 2007
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Audio files: 24

PostPosted: Wed Jun 11, 2008 2:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

Stavros wrote:
Hello,

on the BOM list should VTL3C3 rather be VTL5C3?

Thanks

Stavros


VTL5C3. Sorry for the typo.
BTW, that vactrol is not really needed for the filterbank function.
It's an optional optoelectronic limiter.

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: 27
Location: Athens-Greece

PostPosted: Wed Jun 11, 2008 3:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi again,

I have a problem sourcing the 3,9nF Polyester (MKH, MKT) capacitor.
Could that be replaced by a KERKO-500 ceramic one (reichelt has this).

Regards

Stavros
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jhaible



Joined: May 25, 2007
Posts: 2014
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PostPosted: Wed Jun 11, 2008 5:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

Stavros wrote:
Hi again,

I have a problem sourcing the 3,9nF Polyester (MKH, MKT) capacitor.
Could that be replaced by a KERKO-500 ceramic one (reichelt has this).

Regards

Stavros


Yes, that's what I did, ceramic.
Another option would be to connect 1.2nF and 2.7nF in parallel.
Strange that 3.9nF has suddenly become a difficult value - apparently it's not just Reichelt.

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
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PostPosted: Wed Jun 18, 2008 11:24 am    Post subject: Reply with quote  Mark this post and the followings unread

String Filter boards arrived today.

And even though I had a needle adapter built this time (!) and had every board tested with it individually, I'll build another prototype from a pair of these production-run PCBs before I go and sell them.
So, don't pay anything yet before you have an invoice email sent to you, but expect this in the near future.

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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fluxmonkey



Joined: Jun 24, 2005
Posts: 696
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PostPosted: Thu Jun 19, 2008 6:26 am    Post subject: Reply with quote  Mark this post and the followings unread

whoo!
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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Thu Jun 19, 2008 6:49 am    Post subject: Reply with quote  Mark this post and the followings unread

This whole thingamajig going on here is an amazing example of OpAmp circuits gone insane! It's a beautiful music maker and it's a joy to see my very favorite component of all time, the OpAmp, glorified this way. Now, when do I get to ChucKify this beast?
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jhaible



Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24

PostPosted: Thu Jun 19, 2008 10:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Inventor wrote:
This whole thingamajig going on here is an amazing example of OpAmp circuits gone insane! It's a beautiful music maker and it's a joy to see my very favorite component of all time, the OpAmp, glorified this way. Now, when do I get to ChucKify this beast?


Oh, meanwhile the data are all there on my web site!

I thought you've started cloning it in software already. Smile

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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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Thu Jun 19, 2008 11:17 am    Post subject: Reply with quote  Mark this post and the followings unread

jhaible wrote:
Oh, meanwhile the data are all there on my web site!

I thought you've started cloning it in software already. Smile

JH.


You told me to wait, so I did. The frequency plot helps a lot, but I didn't find the exact information I need which is: What is the center frequency and Q of each filter? With that Info i can quickly code something up! Thanks.

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jhaible



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PostPosted: Sat Jun 21, 2008 4:16 am    Post subject: Final tests Reply with quote  Mark this post and the followings unread

Right from the lab - Tassilo my son is helping to test the string filter prototype.
And even though you don't hear much because of the sound "quality" of the Nikon's built-in mic - yes, it tested good.

PCBs ready for shipping - invoices will be in your mail soon.

JH.


DSCN4552.MOV
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_________________
"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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softfin



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PostPosted: Wed Jun 25, 2008 10:31 am    Post subject: Reply with quote  Mark this post and the followings unread

Received the boards today, thanks a lot JH!
I'll probably attempt to do a stereo version that will be fitted in the same enclosure along with two Tau Pipe phasers, two Triple choruses and two Krautrock phasers. I'm planning to use just one power supply to power all these effects. How much mA would those eight effects approximately need?
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jhaible



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PostPosted: Wed Jun 25, 2008 10:56 am    Post subject: Reply with quote  Mark this post and the followings unread

softfin wrote:
Received the boards today, thanks a lot JH!
I'll probably attempt to do a stereo version that will be fitted in the same enclosure along with two Tau Pipe phasers, two Triple choruses and two Krautrock phasers. I'm planning to use just one power supply to power all these effects. How much mA would those eight effects approximately need?


Hard to say - depends on so many things.
Certainly less than 800mA, probably a lot less than 500mA.

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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softfin



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PostPosted: Wed Jun 25, 2008 11:08 am    Post subject: Reply with quote  Mark this post and the followings unread

jhaible wrote:
softfin wrote:
Received the boards today, thanks a lot JH!
I'll probably attempt to do a stereo version that will be fitted in the same enclosure along with two Tau Pipe phasers, two Triple choruses and two Krautrock phasers. I'm planning to use just one power supply to power all these effects. How much mA would those eight effects approximately need?


Hard to say - depends on so many things.
Certainly less than 800mA, probably a lot less than 500mA.

JH.


Ok, thanks for the advice.

Last edited by softfin on Thu Jun 26, 2008 1:42 am; edited 1 time in total
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