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crashlander42
Joined: Oct 21, 2006 Posts: 292 Location: Orlando, FL (US)
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Posted: Mon Aug 25, 2008 7:06 pm Post subject:
Tuning my SN Voice Subject description: FIXED IT! I WIN!! Thanks all who gave advice!! |
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I recently completed the my SN Voice board and just set about tuning it tonight and the thing is driving me insane. Fully clockwise on the V/Oct Trim it is ALMOST there. I feel like if I could give the thing just another half turn it would be there, but no. If I turn the trim CCW it just gets worse (notes spread further, if that makes any sense). Any thoughts on what would cause this, and how I could fix is? I've tuned several VCO's now and haven't run into this before.
Any help or suggestions would be greatly appreciated. _________________ When they plug me in the lights go down in Hong Kong.
http://www.myspace.com/isaciongun
http://www.youtube.com/user/Crashlander42
My DIY stuff Flickr Last edited by crashlander42 on Fri Aug 29, 2008 10:13 pm; edited 1 time in total |
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Scott Stites
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Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Tue Aug 26, 2008 9:16 am Post subject:
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Probably a stupid question, but are you following the procedure on the page here?
http://mypeoplepc.com/members/scottnoanh/snvoiceconstructionandcalibration/
If so, does it respond well in the lower area and not so well in the higher area?
I've been stymied before when calibrating V/Oct if I've left any flux underneath the board on the transistor pair.
Just shooting in the dark - I haven't tuned one up since it was on the breadboard, but I recall it not....being...easy at all. But I hates tuning VCOs anyway, don't know why, but I hate it......
Maybe someone who's built from PCB can chime in.
Cheerios,
Scott _________________ My Site |
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crashlander42
Joined: Oct 21, 2006 Posts: 292 Location: Orlando, FL (US)
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Posted: Tue Aug 26, 2008 8:55 pm Post subject:
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Followed the calibration instructions to the letter (I think).
Can't figure it out. I checked for flux and cleaned all I found. I've replaced all components in the expo section. I've cursed at it.
The HF trim doesn't seem to be effecting anything. I'm thinking this might some of the problem. I've replaced the diode, R25 and R30 to see if they might be the problem. I've taken the trim pot out and tested it and it works fine. I see negative voltage on the pin of the HF trim that faces IC3b pin 7 and C1. It ranges from -.74 when the coarse range knob is fully CCW and -13.6 at full CW. Is this normal? I'm stymied.
_________________ When they plug me in the lights go down in Hong Kong.
http://www.myspace.com/isaciongun
http://www.youtube.com/user/Crashlander42
My DIY stuff Flickr |
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Scott Stites
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Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Wed Aug 27, 2008 1:13 pm Post subject:
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It's been over two years since I had the thing on the BB, so I'm hoping someone who's recently tuned one will chime in.
Can you tune the lower voltages to V/Oct linearity - say the first two octaves? I didn't have much of a problem doing that (IIRC) but getting higher octaves to correspond was much more difficult.
An ultimately stupid question: do you have another SN76477N to sub in?
Is it the big roach thing or the smaller "new" version? _________________ My Site |
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Tronato
Joined: Sep 21, 2007 Posts: 274 Location: Florida
Audio files: 2
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Posted: Wed Aug 27, 2008 1:25 pm Post subject:
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Hello!
I'm followong this thread with great interest because I will find myself having to do this in the near future.
However the following REALLY is a stupid question:
Scott, I see you write IIRC in a lot of your e-mails... what does it mean?
Told you it was a stupid question...
Thanks!
TRON |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Wed Aug 27, 2008 1:27 pm Post subject:
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Tronato wrote: | Hello!
I'm followong this thread with great interest because I will find myself having to do this in the near future.
However the following REALLY is a stupid question:
Scott, I see you write IIRC in a lot of your e-mails... what does it mean?
Told you it was a stupid question...
Thanks!
TRON |
If I Remember Correct it means... err ...
_________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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Tronato
Joined: Sep 21, 2007 Posts: 274 Location: Florida
Audio files: 2
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Posted: Wed Aug 27, 2008 1:50 pm Post subject:
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Hello!
Thanks Fonick!
Please excuse the interruption of the thread...
Thanks!
TRON |
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crashlander42
Joined: Oct 21, 2006 Posts: 292 Location: Orlando, FL (US)
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Posted: Wed Aug 27, 2008 4:46 pm Post subject:
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I swapped my SN chip and it's still acting the same. I can't even tune the first couple of octaves. It's almost there. It gets a little worse going up the range. I still feel like the fact that the HF trim dosen't respond means something. maybe I should take the trimmer out and stick a 1 meg resistor in there. I started my tuning at 60Hz.
I'm using the big roach version.
I promised myself I wouldn't fight with this module today. I'll walk away from it and come back and maybe I can figure it out.
Let me know if anyone has a suggestion. _________________ When they plug me in the lights go down in Hong Kong.
http://www.myspace.com/isaciongun
http://www.youtube.com/user/Crashlander42
My DIY stuff Flickr |
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Tronato
Joined: Sep 21, 2007 Posts: 274 Location: Florida
Audio files: 2
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Posted: Wed Aug 27, 2008 5:05 pm Post subject:
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Hello!
Has anybody (apart from Sir Thomas Henry and Scott) managed to tune this little devil?
I hope mine doesn't give me these problems when it's my turn. I haven't finished mine because I'm still undecided as to where or how to box it (initially it will be a stand alone box) and then I'll add the Super Contoller if I ever get the SN Voice to work properly.
Thanks!
TRON
PS: I said Sir Thomas Henry because his name has this Anthony Hopkins or Laurence Olivier sound to it...absolutely no offense meant Scott (LOL). Last edited by Tronato on Tue Sep 02, 2008 10:51 am; edited 1 time in total |
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crashlander42
Joined: Oct 21, 2006 Posts: 292 Location: Orlando, FL (US)
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Posted: Wed Aug 27, 2008 8:56 pm Post subject:
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Just because I'm having problems doesn't mean you will. I bought this board off of the first run of SN-Voice boards nearly 2 years ago. I populated about half of it, set it aside and just finished it about a month or so ago.
When I originally started populating the board I had just started getting into electronics and only had a few guitar pedals and a Soundlab under my belt. I probably made some mistake somewhere and just haven't found it yet.
Other than being slightly out of tune my SNVoice is awesome. I'm sure I'll figure it out eventually.
What I'm trying to say is don't let my experience discourage you. My problems have nothing yo do with the boards or the circuit. These boards from what I can tell have a pretty good track record. _________________ When they plug me in the lights go down in Hong Kong.
http://www.myspace.com/isaciongun
http://www.youtube.com/user/Crashlander42
My DIY stuff Flickr |
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Tronato
Joined: Sep 21, 2007 Posts: 274 Location: Florida
Audio files: 2
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Posted: Wed Aug 27, 2008 9:22 pm Post subject:
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Hello...
Now I'm REALLY depressed!
If you managed to get a SoundLab to work you should be a cinch away from tunning the SN-Voice.
Imagine what awaits me... I couldn't get a Weird Sound Generator (AKA WSG) to work!
As I have said before in this fine forum, maybe I should just quit this hobby and return to Formula One racing...
Thanks!
TRON |
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crashlander42
Joined: Oct 21, 2006 Posts: 292 Location: Orlando, FL (US)
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Posted: Wed Aug 27, 2008 10:06 pm Post subject:
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i had the same issue with my cgs vco, i could get it almost there, it would start that phasing sound when it gets close but then the pot ran out. i think i must have has some cv pot settings wrong on the panel. it still isnt done as i am re-panelling the module. though i tried last night and failed again,. sigh.
i hate tuning things, i've learnt from this that i aint got no golden ears thats for sure. _________________ problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
http://www.last.fm/user/prblmchild |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Thu Aug 28, 2008 9:53 am Post subject:
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the SN voice is a proven design (what else to expect from bill? he does an amazing job). i built one from the first batch and it works fine. _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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sneakthief
Joined: Jul 24, 2006 Posts: 569 Location: Berlin
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Posted: Thu Aug 28, 2008 4:25 pm Post subject:
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i perf-boarded 2 sn-voices (ouch!) and built one from bill's pcb. all three are great over 4-5 octaves. i use them regularly to record music and am pretty happy with their tuning and stability.
i never had to retune them, even after moving my whole modular to a new flat.
are you using lm394's?
cheers,
michel _________________ Sneak-Thief - raw electrofunk |
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crashlander42
Joined: Oct 21, 2006 Posts: 292 Location: Orlando, FL (US)
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crashlander42
Joined: Oct 21, 2006 Posts: 292 Location: Orlando, FL (US)
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Posted: Fri Aug 29, 2008 10:09 pm Post subject:
Subject description: FIXED! I WIN! |
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Soooo... I noticed that when I had my thumb on the tempco that it would go in perfect tune, so I added a 100ohm resistor inline with it and now the tuning is perfect around 5 or 6 octaves. Go figure. I knew if I walked away from it for a while I'd figure it out!
Any idea where I might have gone wrong or do you think it was just a slight variation in the SN chip?
Either way I'm happy.
Thanks for the advice.
Now you get building on your SNVoice Tron! _________________ When they plug me in the lights go down in Hong Kong.
http://www.myspace.com/isaciongun
http://www.youtube.com/user/Crashlander42
My DIY stuff Flickr |
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Tronato
Joined: Sep 21, 2007 Posts: 274 Location: Florida
Audio files: 2
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Posted: Tue Sep 02, 2008 10:47 am Post subject:
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Hello!
Congratulations Crashlander!
About that 100 ohm resistor, does "inline" mean in paralell or in series?
Thanks!
TRON |
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Scott Stites
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Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Tue Sep 02, 2008 11:04 am Post subject:
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Quote: | Any idea where I might have gone wrong |
Yeah - you didn't have a 100R resistor inline with the tempco.
But, seriously this is good info to have in case someone else runs into the same situation. Maybe variation with the SN76477? I dunno, but I'm glad to see you figured it out and have it going in that fab modular of yours.
Cheerios,
Scott _________________ My Site |
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State Machine
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Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Sun Sep 07, 2008 12:00 pm Post subject:
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Quote: | As I have said before in this fine forum, maybe I should just quit this hobby and return to Formula One racing... |
Just remember, every failure will make you a better technician/engineer. It gives you a chance to explore the problems and learn a great deal. Keep going and never give up man !!!!!
Bill |
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State Machine
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Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Sun Sep 07, 2008 12:01 pm Post subject:
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Quote: | But, seriously this is good info to have in case someone else runs into the same situation. Maybe variation with the SN76477? I dunno, but I'm glad to see you figured it out and have it going in that fab modular of yours. |
Could add this to my documentation, just in case .........
Bill |
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State Machine
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Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Sun Sep 07, 2008 12:03 pm Post subject:
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Quote: | the SN voice is a proven design (what else to expect from bill? he does an amazing job). |
Well, I can take credit for the PCB, THANKS, but it's really TH who did the great job of making the 76477 sing in tune
Thanks Fonik, you have always been a great supporter to me !!
Bill |
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Pehr
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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crashlander42
Joined: Oct 21, 2006 Posts: 292 Location: Orlando, FL (US)
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Posted: Thu Sep 11, 2008 10:28 pm Post subject:
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Quote: |
About that 100 ohm resistor, does "inline" mean in paralell or in series? |
I meant in series.
State Machine's SN voice board was great. It was my introduction to making connectors and actually using headers (practice for the Klee). I'm quite fond of my collection of Fonitronic modules as well. In fact, I don't think I've ever bought a PCB I didn't like off of electro-music.com . Nothing but respect for the lot of ya.
I'd like to see some more TH PCB offerings. _________________ When they plug me in the lights go down in Hong Kong.
http://www.myspace.com/isaciongun
http://www.youtube.com/user/Crashlander42
My DIY stuff Flickr |
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Tronato
Joined: Sep 21, 2007 Posts: 274 Location: Florida
Audio files: 2
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Posted: Fri Sep 12, 2008 9:35 am Post subject:
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Hello!
I can't figure it out... if the tempco (R7) must be as close as possible to the LM394 and even the use of Thermal Compound is recommended, where do you physically fit in the extra 100R resistor?
Could you post a picture of that detail?
Thanks!
TRON |
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