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droffset
Joined: Feb 02, 2009
Posts: 466
Location: new zealand
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 Posted: Tue Apr 06, 2010 8:30 pm Post subject:
SN voice wiring |
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Hello, I'm really close to being done with the SN voice but have a small query. The Coarse, Fine and Noise Init pots all need +- 15v connections but only one of them references J1 connections to do it. Can I use the same for all three and star out to them from that one location?
Cheers, can't wait to turn this on and hopefully not burn the house down.
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v-un-v
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| Posted: Wed Apr 07, 2010 7:26 am Post subject:
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Have you decided on wether you are going to have a 7 octave range, or PWM?
My board is also pretty much there (just need to solder a couple more caps, and put the main chip in). But I've been pondering the above. Have left out two resistors on the board.
I asked the same question elsewhere, but no one answered. Damn this forum!  
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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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RF
Joined: Mar 23, 2007
Posts: 1459
Location: Northern Minnesota, USA
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| Posted: Wed Apr 07, 2010 7:52 am Post subject:
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| v-un-v wrote: | | Have you decided on wether you are going to have a 7 octave range, or PWM? |
I have not even started on my board - which has sat far too long... I didn't even know there was a choice like that to be made. 
Be that as it may... for my uses PWM would be the choice.
| v-un-v wrote: |
I asked the same question elsewhere, but no one answered. Damn this forum! |
lol... unresolved issues, v-un-v?
bruce
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v-un-v
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| Posted: Wed Apr 07, 2010 7:57 am Post subject:
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_________________
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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droffset
Joined: Feb 02, 2009
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Location: new zealand
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| Posted: Wed Apr 07, 2010 11:45 am Post subject:
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Hmm, I clearly didn't read enough in the instructions, I didn't know there was a choice to make there. I just soldered every part to the board, and it appears to have Scott's mods incorporated into the plans.
One of the switches is meant to adjust PWM, I guess it's just built in.
I think I'm just going to try the +-15 thing and see what happens, and see what's involved in calibrating. For now I don't need perfect musical accuracy, but when I figure out a MIDI->CV solution I'll need it.
_________________
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mark_olson
Joined: Oct 26, 2006
Posts: 178
Location: Lawrence, Kansas
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| Posted: Wed Apr 07, 2010 1:43 pm Post subject:
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| droffset wrote: | | didn't know there was a choice to make there. |
I don't remember making such a choice either. I just took a loot at Scott's site and didn't see anything about it on the surface. But details often elude me.
| Quote: | | try the +-15 thing and see what happens |
Recall is a little fuzzy but I think I just daisy-chained the necessary voltage from wherever it was nearby.
Mark |
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droffset
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v-un-v
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| Posted: Thu Apr 08, 2010 3:25 am Post subject:
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| mark_olson wrote: | | droffset wrote: | | didn't know there was a choice to make there. |
I don't remember making such a choice either. I just took a loot at Scott's site and didn't see anything about it on the surface. But details often elude me.
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You obviously didn't read the instructions properly  
_________________
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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mark_olson
Joined: Oct 26, 2006
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Location: Lawrence, Kansas
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| Posted: Thu Apr 08, 2010 7:09 am Post subject:
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| v-un-v wrote: | | You obviously didn't read the instructions properly |
Thanks for setting me straight.
I see what you're talking about; in paragraph 2 of Scott's "Anatomy of..."
I improperly read that as an explanation of a circuit design decision but I see that if I had taken a more critical approach I would have seen the invitation to go off-road.
Oh well, not the first time I've been called out for being to "cookbook" in my approach.
I don't have any regrets about taking pwm over extended high end, even though I didn't realize at the time that's the trade-off I made.
One thing I would do differently though is to do the eg response control mod.
Mark |
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droffset
Joined: Feb 02, 2009
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| Posted: Thu Apr 08, 2010 2:53 pm Post subject:
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I'm blind, still can't see it on the website. But it still works without choosing!
This module is sooo much fun to play with. Need to get a new oscilloscope probe to calibrate it properly.
_________________
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Check out the FREE Intro to Lunettas Document
https://docs.google.com/Doc?docid=0AZIwOP-PR9sSZDlidzgzbV8wY3RjenJqanY&hl=en
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mark_olson
Joined: Oct 26, 2006
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| Posted: Thu Apr 08, 2010 3:00 pm Post subject:
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| droffset wrote: | I'm blind, still can't see it on the website. But it still works without choosing!
This module is sooo much fun to play with. Need to get a new oscilloscope probe to calibrate it properly. |
If I'm right about what v-un-v is referring to it is in the second paragraph of this page:
http://mypeoplepc.com/members/scottnoanh/anatomyofthesnvoice/
Yes, it is a ton of fun.
Mark |
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v-un-v
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droffset
Joined: Feb 02, 2009
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| Posted: Thu Apr 08, 2010 3:16 pm Post subject:
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Ah ok, cool.
I remember looking at that entry on the parts list and not knowing why it was there.
I'm a cookbook guy I guess. As long as it works it can always be tweaked and modded later.
One thing the instructions could be a tiny bit more clear on is the Env lock switch and if the on-on-on switch is really necessary and how to achieve that function without it.
Other than that very happy.
_________________
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Check out the FREE Intro to Lunettas Document
https://docs.google.com/Doc?docid=0AZIwOP-PR9sSZDlidzgzbV8wY3RjenJqanY&hl=en
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mark_olson
Joined: Oct 26, 2006
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| Posted: Thu Apr 08, 2010 7:11 pm Post subject:
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| v-un-v wrote: |
Yes. And this too (which is a note in the parts list); |
Thanks. I'm embarrassed to admit that unlike droffset, I don't remember ever noticing that even though it most certainly is right there on my parts list too.
I did see the gorilla though
http://viscog.beckman.illinois.edu/grafs/demos/15.html
Mark |
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State Machine
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| Posted: Fri Apr 09, 2010 8:27 am Post subject:
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ON the following statement from the anotomy if the SNV:
| Quote: | | Important Note: The SN-Voice uses +/-15V and +5V supplies. To avoid damage to the SN76477, pay special attention to the power connections when building the SN-Voice. |
Just for folks looking from the outisde who have not build an SNV yet. If you use my PC board, an external +5V power supply willl not be necessary. Otherwise, the circuit is virtually identical to Thomas Henry's. The SNV has also been run using +12V/-12V supplies also.
Good discussion though and this made me look back at the underpinnings of how the SN76477 chip behaves.
Bill |
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