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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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 Posted: Sun Jul 12, 2009 2:35 pm Post subject:
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| ericcoleridge wrote: | | I'd be up for some of these also. Perhaps 2 or 4 of these circuits could fit into the TW LPG PCB footprint? |
since i am not a native speaker, could you be so kind to explain your request in plain words? 
all that this board will do is replacing the manual mode switch.
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cheers,
matthias
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Big Boss at fonitronik
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Sun Jul 12, 2009 3:58 pm Post subject:
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| fonik wrote: | | ericcoleridge wrote: | | I'd be up for some of these also. Perhaps 2 or 4 of these circuits could fit into the TW LPG PCB footprint? |
since i am not a native speaker, could you be so kind to explain your request in plain words?
all that this board will do is replacing the manual mode switch. |
Sorry Fonik, I hope it wasn't presumptuous of me to introduce this request. Not trying to be insolent  . But, what I meant is this-- if your switching circuit is small enough, it might be useful to some builders to have more than one switching/logic circuit on a single PCB. Adding a single(quad switch/logic, for instance) PCB to one's Quad LPG (or dual LPG, whatever) would make panel assembly a lot easier than 1 Switch PCB per LPG. On a Quad module, it could get quite complicated trying to mount 8 PCBs (4 LPGs, 4 Switches).
Also, if you were to make this PCB, seeing your intention is to make it a sister board to Thomas' PCB, it could be useful if the mounting hole grid, on your PCB, could line up to mounting hole grid on Thomas's LPG PCB.
I realize I was jumping the gun here, sorry again. |
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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: Sun Jul 12, 2009 4:34 pm Post subject:
Subject description: EXPANSION BOARD? |
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| fonik wrote: | but that's not all. 
i became more interested in logic/control lately, so i am currently working on an expansion PCB for thomas LPG PCB.
Lo/Lo = gate
Lo/Hi = lopass
Hi/Lo = both
Hi/Hi = both
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I'm very interested !
i use(d) my LPGs mostly in both mode,
so for me having Lo/Lo = both , would be best.
I guess i remember a post from you where you statet that you also use the both mode most often.
Many others i think too
so you need no signal to get the both mode. But i think i see your logic .
My logic would be ( but not knowing the electronics behind)
both = Lo/Lo
LP = Hi/LO
VCA = Lo/ Hi
What IC you need ?
a hole grid that matches Thomas whites PCBs would be great |
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DGTom
Joined: Dec 08, 2008
Posts: 211
Location: Adelaide
Audio files: 3
G2 patch files: 1
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| Posted: Sun Jul 12, 2009 6:23 pm Post subject:
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Mine arrived several hours after I posted my last message
I am very, very interested in the Switch Daughterboard!
I agree with Funky that Lo/Lo = Both is more practical, but, it depends. If implementing that adds needless complexity it may not be worth it. |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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Posted: Tue Jul 14, 2009 10:06 pm Post subject:
Re: Resonant Lopass Gate PCB Project
Subject description: LEDs |
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| davebr wrote: | | 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.
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How about using a 3PDT (3P3T?) with the first 2 sets of poles wired in the configuration below (from Polyfusion modular via Simple Answer DIY) and the last set wired for LEDs as described?
 |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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Posted: Tue Jul 14, 2009 10:55 pm Post subject:
Subject description: EXPANSION BOARD? |
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| Funky40 wrote: | i use(d) my LPGs mostly in both mode,
so for me having Lo/Lo = both , would be best.
I guess i remember a post from you where you statet that you also use the both mode most often.
Many others i think too
so you need no signal to get the both mode. But i think i see your logic .
My logic would be ( but not knowing the electronics behind)
both = Lo/Lo
LP = Hi/LO
VCA = Lo/ Hi |
i get your point, mr funky. my idea was to have LP mode as default, just because this is the only mode the resonance is available.
anyways, the 1st bit will decide about <both> on or off, the state of the 2nd bit does not matter then. the 2nd bit only works, when <both> is off. so your thruth table above won't work.
however, these would be the two options i can think of for now:
both= Lo/Lo or Lo/Hi
LP= Hi/Lo
VCA = Hi/Hi
or
both= Lo/Lo or Lo/Hi
VCA= Hi/Lo
LP = Hi/Hi
_________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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ChrisR
Joined: Feb 22, 2009
Posts: 24
Location: Dark side of the room
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Posted: Wed Jul 15, 2009 1:52 am Post subject:
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My two boards arrived today (Germany). In perfect condition
Thomas, thanks a lot for all the work!
I'm pretty sure i'll put in a switch to select between a vtl5c3/2 and a vtl5c4/2. Maybe even make it switchable with a gate/trigger/VCS? That is, if i figure out how to do it...
BTW, i'm also very interested in expansion boards for mode selection. |
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wmonk
Joined: Sep 15, 2008
Posts: 529
Location: Enschede, the Netherlands
Audio files: 15
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Posted: Wed Jul 15, 2009 4:05 am Post subject:
Subject description: EXPANSION BOARD? |
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| fonik wrote: |
both= Lo/Lo or Lo/Hi
LP= Hi/Lo
VCA = Hi/Hi
or
both= Lo/Lo or Lo/Hi
VCA= Hi/Lo
LP = Hi/Hi |
What about Lo/Lo = use rotary switch setting instead? |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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Posted: Wed Jul 15, 2009 4:15 am Post subject:
Subject description: EXPANSION BOARD? |
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| wmonk wrote: | | fonik wrote: |
both= Lo/Lo or Lo/Hi
LP= Hi/Lo
VCA = Hi/Hi
or
both= Lo/Lo or Lo/Hi
VCA= Hi/Lo
LP = Hi/Hi |
What about Lo/Lo = use rotary switch setting instead? |
i planned to provide on/off switches for each bit, overriding the incoming gates. and i wanted to keep it simple, using one CA4053. i hope you understand.
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cheers,
matthias
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Big Boss at fonitronik
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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Posted: Wed Jul 15, 2009 10:23 pm Post subject:
Resonant Lopass Gate PCB Project
Subject description: Output waveforms |
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I managed to apply power to my PCB tonight. I played with various control settings and posted some scope images of the three modes. The resonance is definitely a nice addition.
http://modularsynthesis.com/nrm/lopass/lopass.htm
Dave |
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diablojoy
Joined: Sep 07, 2008
Posts: 809
Location: melbourne australia
Audio files: 11
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| Posted: Fri Jul 17, 2009 11:30 pm Post subject:
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| any left ? if so 2 boards please |
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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 18, 2009 8:50 am Post subject:
Subject description: EXPANSION BOARD? |
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| fonik wrote: |
however, these would be the two options i can think of for now:
both= Lo/Lo or Lo/Hi
LP= Hi/Lo
VCA = Hi/Hi
or
both= Lo/Lo or Lo/Hi
VCA= Hi/Lo
LP = Hi/Hi |
it is confusing me,
glad that i don't have to design such a thing 
so it seems anyway how doing it, you need for one setting two inputs at the same time.
I guess in this case i would prefer to have the both mode as a default, and then only one switching option.
so i would need a jumper on the back ( PCB? ) or a switch on the faceplate to decide if the hi signal switches to LP or to VCA mode.
having a Docs with several wiring options would be a great thing then  |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Sat Jul 18, 2009 9:42 am Post subject:
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How is the logic applied to the switch?
will it not just toggle through the modes from a pulse? |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Sat Jul 18, 2009 11:11 am Post subject:
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the idea was to have a simple solution for controlling the mode with external gates. then just add two SPST switches, one for each gate, to manually control the mode. this way you could use two gate signals or just one gate signal, while controlling the other input manually with a switch.
clear as mud?
this would ad two sockets and two switches at least, but would be very versatile.
one could manually set gate1 high (both off) and use an external signal to control gate2, switching between LP and VCA.
or set gate2 manually to VCA and use an external signal to control gate1, switching between Both and VCA.
or...
anyways, one could decide which controls to bring to the front panel.
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cheers,
matthias
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haricots
Joined: Aug 15, 2007
Posts: 33
Location: guelph
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| Posted: Sun Jul 19, 2009 5:15 pm Post subject:
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| Please make fun of me only after helping me out ... I cannot figure out how to wire up the Control socket and pot. Can I get some friendly help? |
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djthomaswhite
Joined: Nov 22, 2007
Posts: 140
Location: Orange, CA
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haricots
Joined: Aug 15, 2007
Posts: 33
Location: guelph
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| Posted: Mon Jul 20, 2009 6:24 am Post subject:
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Great thanks!
Just to sum this up so I don't screw it up right off the bat:
Pot: 1 to ground, 2 to cv in (under direct ins?), 3 to cv in jack (tip?).
Cv jack to ground.
Since I'm not using more than one audio or cv input I don't use the sum stage pads at all, correct?
With any luck I'll have this thing running within a few minutes tonight.  |
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stevenclements
Joined: Nov 16, 2005
Posts: 74
Location: Edmonton, Alberta
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haricots
Joined: Aug 15, 2007
Posts: 33
Location: guelph
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Mon Jul 20, 2009 12:25 pm Post subject:
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| haricots wrote: | | .... also, I purchased the wrong 0.1uF cap with my Mouser order. It's actually rated fine but the lead spacing is much bigger than what the board requires. I soldered some resistor clippings to both legs of the cap and attached it this way. My question is, is this a no-no or am I ok? |
you're okay.
_________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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adambee7
Joined: Apr 04, 2009
Posts: 420
Location: united kingdom
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| Posted: Mon Jul 20, 2009 12:59 pm Post subject:
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| you want too see some of my kludging. |
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stevenclements
Joined: Nov 16, 2005
Posts: 74
Location: Edmonton, Alberta
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haricots
Joined: Aug 15, 2007
Posts: 33
Location: guelph
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| Posted: Mon Jul 20, 2009 4:42 pm Post subject:
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so close ... but just not getting it. Can someone please, please lay it out for me here so I can play!!???
The Control pot has one lug to ground, wiper to Direct CV in, last lug to CV jack tip.
I have one wire left over with no home - CTRL jack tip. Where does this go?
I think my trouble is I can't yet grasp the concept of the control function.
I'll keep my soldering iron on in anticipation.  |
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haricots
Joined: Aug 15, 2007
Posts: 33
Location: guelph
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| Posted: Tue Jul 21, 2009 5:25 am Post subject:
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Thanks to some friendly folks on Muffs site I have the LPG working. It's seems the signal for the deep portion needs a really hot signal because all I get is a really low rumble.
The only thing I'm not sure about is I connected the CV jack and Control to the same pad on the PCB. Seems to work fine for both but I'm unclear if this was the right thing to do.
I'm very happy with this beautiful sounding module! |
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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Posted: Fri Jul 31, 2009 8:32 pm Post subject:
Resonant Lopass Gate PCB Project
Subject description: Finished module |
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I got my FPE panel and finished up my module. Sounds nice. Photos and information at
http://modularsynthesis.com/nrm/lopass/lopass.htm
Dave |
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