Would you buy a Jh Trapezoid VCA PCB? |
no - only interested in the original EMS circuit (this is not goint to happen - sorry) |
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2% |
[ 1 ] |
yes - if it emulates the behaviour of the EMS circuit, and doesn't need component selecting |
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97% |
[ 40 ] |
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Total Votes : 41 |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Thu Sep 30, 2010 12:06 am Post subject:
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PCBs arrived.
I hope I'll find the time to build another prototype from one of these - I always build one from production run PCBs in order to avoid any trouble, before I start shipping.
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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LektroiD
Joined: Aug 23, 2008 Posts: 1018 Location: Scottish Borders
Audio files: 2
G2 patch files: 2
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Thu Sep 30, 2010 12:18 pm Post subject:
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It's been a while since I've looked at Buchla schemos.
I'd expect the Buchla module to be a lot more powerfull and "perfect" in its waveforms than the EMS (after which I've modelled mine).
People who love EMS, normally love it for quirks and unexpected behaviour.
ETA: On the Buchla 281, you have a plethora of possibilities, and you connect two separte sections to get a similar function as with the EMS. On the Synthi, you have just a few knobs that interact in a unique way. There isn't even a switch to go from self-cycling mode to one-shot envelope. You do it all with the same potentiometer that also sets the Off time ...
It's a very, very ergonomic concept. Hard to explain, but immediately appealing once you have tried it.
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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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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Posted: Thu Sep 30, 2010 3:34 pm Post subject:
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I spoke to Bob Williams today, of Analogue Systems fame. AS being one of only a a small handful of companies allowed under licence to do a clone of this unique EMS device (Jurgen, I'm very pleased to announce, being another one of that 'handful' ). AS knows (Bob told me) that Jurgen will deliver something really special, probably even better than 'the real thing'. Personally I can't wait! _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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emdot_ambient
Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD
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Posted: Fri Oct 01, 2010 2:42 pm Post subject:
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Yeah, I'm stoked about this one, too. I'm all for improving on old classic designs! |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Sun Oct 10, 2010 8:44 pm Post subject:
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I'm offline for a few days. Business trip to Berlin, *and* debitel email died on Friday.
I received some payments for the Trapezoid PCBs already, and will ship next weekend, but can't send out individual confirmation emails right now. Just in cese you wondered.
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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MR-808
Joined: Sep 30, 2010 Posts: 28 Location: Portland, OR
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Posted: Sun Oct 10, 2010 9:13 pm Post subject:
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Jürgen,
If you have time, would you be so kind as to briefly describe each of the connectors on the circuit board? Some are easy to figure out from the Synthi front panel, some not. I am finding it difficult to design a front panel without knowing more about the "variety of extra functions that you can implement, or omit".
Vielen dank! |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Sun Oct 10, 2010 11:26 pm Post subject:
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MR-808 wrote: | Jürgen,
If you have time, would you be so kind as to briefly describe each of the connectors on the circuit board? Some are easy to figure out from the Synthi front panel, some not. I am finding it difficult to design a front panel without knowing more about the "variety of extra functions that you can implement, or omit".
Vielen dank! |
I will, and hopefully more than just briefly, but only when I'm back.
Sorry for the delay, but things are extremely turbulent around here, and right now I have to catch a flight.
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: Fri Oct 15, 2010 2:09 pm Post subject:
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Schematics
http://www.jhaible.de/trapezoid/trapezoid_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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numbertalk
Joined: May 05, 2008 Posts: 992 Location: Austin, TX
Audio files: 5
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Posted: Fri Oct 15, 2010 2:26 pm Post subject:
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Calibration instructions at some point much appreciated too
jhaible wrote: | MR-808 wrote: | Jürgen,
If you have time, would you be so kind as to briefly describe each of the connectors on the circuit board? Some are easy to figure out from the Synthi front panel, some not. I am finding it difficult to design a front panel without knowing more about the "variety of extra functions that you can implement, or omit".
Vielen dank! |
I will, and hopefully more than just briefly, but only when I'm back.
Sorry for the delay, but things are extremely turbulent around here, and right now I have to catch a flight.
JH. |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Tue Oct 19, 2010 11:59 pm Post subject:
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numbertalk wrote: | Calibration instructions at some point much appreciated too
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Thanks for reminding me. I just wrote them and put theme online, Sir!
http://www.jhaible.de/trapezoid/trapezoid.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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numbertalk
Joined: May 05, 2008 Posts: 992 Location: Austin, TX
Audio files: 5
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Posted: Wed Oct 20, 2010 5:26 am Post subject:
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Thank you sir!
And no rush, just making sure I'm not missing it - there's not a BOM up yet, is there? Didn't see a link to one.
P.S. Got my board yesterday - thanks!
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intercorni
Joined: Jun 04, 2007 Posts: 69 Location: hamburg
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Posted: Thu Oct 21, 2010 9:43 am Post subject:
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When will release the BOM? |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Thu Oct 21, 2010 3:22 pm Post subject:
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intercorni wrote: | When will release the BOM? |
All the information is in the schematics and component overlay already. I'm pretty sure someone else will be faster writing a BOM than me.
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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e-grad
Joined: Sep 12, 2008 Posts: 142 Location: Berlin
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numbertalk
Joined: May 05, 2008 Posts: 992 Location: Austin, TX
Audio files: 5
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Posted: Sat Oct 23, 2010 6:47 am Post subject:
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e-grad wrote: | Hopefully a faultless BOM for the Trapezoid. Pls note whether the input/output connectors nor the pots are included. The PSU is not accounted for eiher. |
Awesome! We'll need the wiring diagram(s) for the pots and jacks.
Edit - oops just checked and pots seem to be on the schematic. |
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Girts
Joined: Aug 21, 2009 Posts: 8 Location: Latvia
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Posted: Sat Oct 23, 2010 7:48 am Post subject:
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there should be one 100K trimmer (10mm), one 2M multiturn trimmer and nine 100nF SMT capacitors (on the solder side) as well. |
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e-grad
Joined: Sep 12, 2008 Posts: 142 Location: Berlin
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Posted: Sat Oct 23, 2010 8:03 am Post subject:
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Girts wrote: | there should be one 100K trimmer (10mm), one 2M multiturn trimmer and nine 100nF SMT capacitors (on the solder side) as well. |
Sorry! You're right. Even though I've noted down the trimmers I've forgotten to include them in my BOM. However I totally missed out any the SMT cap. By now I've correctd the BOM but left off those 4 SMT caps which are part of the PSU.
Pls, note the BOM above is corrected. Yet still no connectors nor any PSU related parts. |
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jhaible
Joined: May 25, 2007 Posts: 2014 Location: Germany
Audio files: 24
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Posted: Sat Oct 23, 2010 8:31 am Post subject:
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Guys, I love you all.
I really appreciate that helpful spirit in this forum, where I can concentrate on those things that only I can do, and others helping with BOMs and debugging.
Thank you!!
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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decaying.sine
Joined: Aug 31, 2009 Posts: 92 Location: New Haven, CT, USA
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Posted: Sat Oct 23, 2010 9:41 am Post subject:
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e-grad wrote: | Hopefully a faultless BOM for the Trapezoid. Pls note whether the input/output connectors nor the pots are included. The PSU is not accounted for eiher.
edit: corrected BOM |
Thanks for the BOM!
I have one question about the caps. For the non electrolytic caps, are those ceramic disc, metallized polypropylene, or something else?
I always have trouble figuring out what caps are meant to be used when they are the non-electrolytic ones.
Thanks,
Brian |
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e-grad
Joined: Sep 12, 2008 Posts: 142 Location: Berlin
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Posted: Sat Oct 23, 2010 9:57 am Post subject:
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Since Jürgen has not specified any performance characteristics I will follow the routine:
for small values (pF): ceramic
for bigger values (nF): polyester
and even bigger values (above 1µF): elcos. |
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decaying.sine
Joined: Aug 31, 2009 Posts: 92 Location: New Haven, CT, USA
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Posted: Sat Oct 23, 2010 10:27 am Post subject:
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e-grad wrote: | Since Jürgen has not specified any performance characteristics I will follow the routine:
for small values (pF): ceramic
for bigger values (nF): polyester
and even bigger values (above 1µF): elcos. |
Thanks. I'll use that as a rule of thumb for other projects too when the type is not specified! |
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intercorni
Joined: Jun 04, 2007 Posts: 69 Location: hamburg
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Posted: Tue Oct 26, 2010 5:58 am Post subject:
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Thanks for the BOM! |
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emdot_ambient
Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD
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Posted: Wed Oct 27, 2010 10:24 am Post subject:
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..OK..senior moment...what's an "elcos."?
And BTW, PCBs arrived! |
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e-grad
Joined: Sep 12, 2008 Posts: 142 Location: Berlin
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Posted: Wed Oct 27, 2010 10:51 am Post subject:
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emdot_ambient wrote: | ..OK..senior moment...what's an "elcos."? |
I thought it a common abbr. for electrolytic capacitors. Sorry.
Is "elcap" common? |
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