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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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 Posted: Mon Jun 29, 2009 9:03 pm Post subject:
Resonant Lopass Gate PCB Project
Subject description: LEDs |
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| ericcoleridge wrote: | | I would like to find a way to switch 2 LEDs on and off to indicate the current mode ala the original buchla faceplate. Could there be a way to do so using the optional on-boards op-amps? |
The easiest would be to use the rotary switch as there is one unused section that you could wire up to drive the LEDs. Wire the LEDs to the individual switches for the VCA and VCF. Wire two steering diodes between these and Both switch.
You could do the same with the toggle switch if you can find a 4PDT On-Off-On switch.
Dave |
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isacsen
Joined: Apr 30, 2009
Posts: 11
Location: ...getting closer to the modular!
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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Posted: Tue Jun 30, 2009 8:02 am Post subject:
Re: Resonant Lopass Gate PCB project
Subject description: Reversing attenuators |
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| isacsen wrote: | | [I think I'll be using two reversing attenuators and 3 input mixers for my board. I've modified your drawing to suit my needs (attached). As you can see I've actually had to add an extra dual op-amp (TL072). I figured I could glue this to the backside of the frontpanel or on the PCB if space permits. |
You still have one op-amp unused! You don't need the last inverter. Use the Inv Out as the input to the CV jumper pin 2. Leave out R24. Now change the "signs" on your CV level controls (e.g. swap the + and -). At the positive side, you are going through 2 inverters. On the negative side you are going through one inverter.
Dave
Last edited by davebr on Wed Jul 01, 2009 10:02 pm; edited 1 time in total |
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isacsen
Joined: Apr 30, 2009
Posts: 11
Location: ...getting closer to the modular!
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Posted: Tue Jun 30, 2009 12:20 pm Post subject:
Re: Resonant Lopass Gate PCB project
Subject description: Reversing attenuators |
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Wow, you're good. That was a very good explanation.
That just leaves me wondering what I can use the last op-amp for? (I could use a single op-amp) |
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CJ Miller
Joined: Jan 07, 2007
Posts: 368
Location: 127.0.0.1
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| Posted: Tue Jun 30, 2009 2:00 pm Post subject:
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I just got my boards last weekend, and can hardly wait to build them. I was wondering whether or not I need to do anything special with the levels, as I am putting some of them in a regular 10V signal system, but I want to put the rest in a Buchla-style system with its standard 1V signals. Is there anything I should watch out for?
Big thanks to Thomas, Don, Peter, and the other participants! |
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robotfunk
Joined: Jun 22, 2009
Posts: 20
Location: Netherlands
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| Posted: Tue Jun 30, 2009 3:47 pm Post subject:
boards are in! |
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| Just a quick note to tell you the boards have arrived in Amsterdam, and look very well made! thanks, Jilt |
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monokinetic
Joined: Aug 01, 2006
Posts: 100
Location: prague
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| Posted: Wed Jul 01, 2009 5:24 am Post subject:
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Boards arrived safe and sound in Prague today.
Thanks to DJ Thomas White for running the order, Don for granting permission and the rest of you for providing this excellent community! |
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a_guy_called_tom
Joined: Jun 21, 2008
Posts: 31
Location: mountains
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| Posted: Wed Jul 01, 2009 10:15 am Post subject:
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| Board arrived in Switzerland today. What a nice job! Thanks Thomas! |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Wed Jul 01, 2009 5:01 pm Post subject:
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I don't have access to my PCBs for this project at the moment, but am working on my panel--a little obsessive maybe 
Can anyone tell me the spacing of the stand-off holes? Or is there a 1:1 image of the board anywhere? I want to parallel the PCB to the panel using all 4 posts.
EDIT: I found Thomas' posting of the PCB:
http://electro-music.com/forum/download.php?id=14373
but it's not in scale. If anyone could tell me the actual dimensions of the board, I think I can figure this out.
Last edited by ericcoleridge on Wed Jul 01, 2009 11:03 pm; edited 1 time in total |
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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Posted: Wed Jul 01, 2009 9:43 pm Post subject:
Resonant Lopass Gate PCB project
Subject description: Mounting holes |
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| ericcoleridge wrote: | | Can anyone tell me the spacing of the stand-off holes? Or is there a 1:1 image of the board anywhere? I want to parallel the PCB to the panel using all 4 posts. |
I have my micrometer here for measuring capacitor outlines on another PCB so it will be easy to measure this PCB.
ExpressPCB miniboard service is 3.8" x 2.5"
Mine measures 96.54mm x 63.55mm - pretty close.
The mounting hole grid is 74.25mm x 55.0mm
The center of the mounting hole is 18.0mm from the potentiometer side edge.
That would put the center of the opposite mounting hole at 4.49mm from the MOTM power connector edge. It measures 4.5mm so it checks as I'm just estimating the center of the holes.
Someone else please verify.
There's also a fairly good photo of the PCB on my site. Take it and scale it until the image dimensions are 3.8" x 2.5". That should be close enough. http://modularsynthesis.com/nrm/lopass/lopass.htm
Dave |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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Posted: Wed Jul 01, 2009 11:11 pm Post subject:
Re: Resonant Lopass Gate PCB project
Subject description: Mounting holes |
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| davebr wrote: |
ExpressPCB miniboard service is 3.8" x 2.5"
Mine measures 96.54mm x 63.55mm - pretty close.
The mounting hole grid is 74.25mm x 55.0mm
The center of the mounting hole is 18.0mm from the potentiometer side edge.
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muchas gracias, senior. I think this will get me there.
Last edited by ericcoleridge on Thu Jul 02, 2009 11:32 am; edited 1 time in total |
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303monkey
Joined: Mar 11, 2008
Posts: 65
Location: NODNOL
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| Posted: Thu Jul 02, 2009 3:10 am Post subject:
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Boards arrived in London this morning.
Cheers Thomas |
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isacsen
Joined: Apr 30, 2009
Posts: 11
Location: ...getting closer to the modular!
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Posted: Thu Jul 02, 2009 4:27 am Post subject:
Lopass gate
Subject description: PCB arrival |
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| Boards arrived in Copenhagen yesterday. Super nice quality. Thank you very much Thomas, Don and others. |
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billy pilgrim
Joined: Feb 12, 2008
Posts: 36
Location: nyc
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Posted: Thu Jul 02, 2009 6:36 pm Post subject:
Re: Lopass gate
Subject description: PCB non arrival |
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| I'm feeling left out, haven't received boards yet in NYC. Anyone else in the same boat ? |
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
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Posted: Thu Jul 02, 2009 9:10 pm Post subject:
Re: Lopass gate
Subject description: PCB non arrival |
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| billy pilgrim wrote: | | I'm feeling left out, haven't received boards yet in NYC. Anyone else in the same boat ? |
My boards made it to Brooklyn last week. |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Thu Jul 02, 2009 9:45 pm Post subject:
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| Mine also arrived in brklyn. |
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adambee7
Joined: Apr 04, 2009
Posts: 420
Location: united kingdom
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| Posted: Fri Jul 03, 2009 3:11 am Post subject:
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I live 30 miles from London and I haven't got mine yet. So I don't know.  |
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djthomaswhite
Joined: Nov 22, 2007
Posts: 140
Location: Orange, CA
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| Posted: Fri Jul 03, 2009 8:52 am Post subject:
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Hey guys,
Postage is WEIRD! Almost all domestic boards shipped one one day. The late domestic orders shipped with the international boards 3 days later (last Friday). In batch 1, Euro orders also made it to people before some US ones. If boards are not the in 2 more weeks I'll work something out for each of you. So far only 1 package has come back that I need to send back out from Hanz Muns. They're coming guys!
Now, any early build reports yet?
_________________
Thomas
www.naturalrhythmmusic.com/diy.html |
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adambee7
Joined: Apr 04, 2009
Posts: 420
Location: united kingdom
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| Posted: Fri Jul 03, 2009 9:07 am Post subject:
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| I used be a postman so i know what you mean. |
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LektroiD
Joined: Aug 23, 2008
Posts: 1019
Location: Scottish Borders
Audio files: 2
G2 patch files: 2
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| Posted: Fri Jul 03, 2009 10:55 am Post subject:
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I bought two of these last year. Have there been any revisions on the latest batch?
If so, are there any left?
Also do they have that matt stuff on the pads that my 60/40 solder has a hard time sticking to?
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LektroiD |
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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Posted: Fri Jul 03, 2009 12:25 pm Post subject:
Resonant Lopass Gate PCB Project
Subject description: Build reports |
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| djthomaswhite wrote: | | Now, any early build reports yet? |
Mine is assembled except for the vactrols which are still shipping from Allied. Not very exciting yet but there is a photo on my page.
http://modularsynthesis.com/nrm/lopass/lopass.htm
Dave |
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Brogram
Joined: Nov 18, 2008
Posts: 37
Location: NYC
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| Posted: Fri Jul 03, 2009 6:36 pm Post subject:
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Got mine in Brooklyn last week!
Thanks,
Eric |
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j.dilisio
Joined: May 19, 2009
Posts: 200
Location: baltimore
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| Posted: Fri Jul 03, 2009 7:49 pm Post subject:
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I'm just getting started on my boards and I'm glad to report that my standard 60/40 solder is working very nicely.
Many thanks Thomas! |
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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 Jul 04, 2009 6:30 am Post subject:
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got my Borads too, thanks Thomas.
havn't built any, but i will populate the Boards soon.
| LektroiD wrote: |
Also do they have that matt stuff on the pads that my 60/40 solder has a hard time sticking to? |
i use >> S-sn62Pb36AG2 << solder.
this works with every kind of Boards perfect. I think it is the AG2 part.
I once had a 2 hours call with thre company and was forwarded to a specialist who thought i'm a company too.
He was very kind and explained me everything. ...............Just remember that i have the right solder......... it's the best.
when it was over and i had to solder with other solder, also that 60/40, i was soldering like a beginner. everything was a mess. |
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stevenclements
Joined: Nov 16, 2005
Posts: 74
Location: Edmonton, Alberta
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| Posted: Sun Jul 05, 2009 8:15 am Post subject:
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| panda30y wrote: | | sduck wrote: | | panda30y wrote: | | I I noticed that Thomas' bom from mouser has specified 4 vishay precision pots for the mixing sections. Are precision pots specified for a reason? Otherwise I will buy cheaper pots. Thanks. |
No, you can use just about anything. Those spectrols were expensive when they were $ each, now at 12+$ each they're ridiculous. Alphas will work fine. |
Thanks! That's what I was thinking about doing. |
Can you give us a Mouser Part # for what you're going to swap in place?
cheers
Steve
_________________
http://soundcloud.com/pilfermusic
http://www.gearjunkies-userstudios.com/studio.php?stid=221
life is a treasure... dig it! |
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