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.
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 _________________ "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)
Posted: Mon May 12, 2008 7:35 am Post subject:
Request for assembled string filter module
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.
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)
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)
Good grief! I thought I'd printed out an M C Escher artwork for a minute there.
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)
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)
Is it possible to run this off an 18VAC powerpack JH?
Spratty
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)
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)
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)
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)
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)
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)
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 270
Posted: Thu Jun 19, 2008 6:49 am Post subject:
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? _________________ "Let's make noise for peace." - Kijjaz
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.
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)
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 270
Posted: Thu Jun 19, 2008 11:17 am Post subject:
jhaible wrote:
Oh, meanwhile the data are all there on my web site!
I thought you've started cloning it in software already.
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. _________________ "Let's make noise for peace." - Kijjaz
Posted: Sat Jun 21, 2008 4:16 am Post subject:
Final tests
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.
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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)
Joined: Oct 11, 2006 Posts: 271 Location: Far in the north
Audio files: 1
Posted: Wed Jun 25, 2008 10:31 am Post subject:
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?
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)
Joined: Oct 11, 2006 Posts: 271 Location: Far in the north
Audio files: 1
Posted: Wed Jun 25, 2008 11:08 am Post subject:
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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