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stefano
Joined: Nov 23, 2006
Posts: 33
Location: ITALY
Audio files: 5
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 Posted: Fri Mar 02, 2007 4:08 am Post subject:
Second success
Subject description: .. and a little work is still needed! |
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| stefano wrote: |
I didn't win the war, but I think at least a good battle! I'm on my way to completely debug this circuit because I don't actually like this bypass  .
Next step I'd like to do with an oscilloscope (any advice accepted  ):
- controlling the signal at (IC11 pin 4) = (IC4 pin 13) (after generation of quad switch control signal)
- controlling the signal at IC10 pin 6 (before generation of quad switch control signal)
Stay tuned |
IT WORKS !!!
I discovered that the problem was in a defective soldering of the CD4001 IC11 at pin 11. No signal was generated for activating the microswitch.
After the fixing the problem I read now a +3V pulse at pin 11 IC11, that correspond to pin 13 IC4 (control pin for the switch).
I think that the tracking works well and at the moment I suspect that it's a matter of tuning the right controls, in order to have an exact tracking.
These are the "problems" I'm facing at the moment:
- I play an "A" (5th string, fretless), then I play a B (same string, 2nd fret) and then I play again the same "A" played at first. The problem is that the second "A" is slightly out of tune in respect to the first "A" played.
It seems like if a Capacitor (C12 ?) doesn't discharge at all and keeps memory of the charge due to the "B" note.
- as I am a newbie in the world of synths, it's difficult for me to understand the right procedure for "alligning" the MiniSoundLab according to an external controller (penfold's P2V is in fact a controller, isn't it?). I have a lot of degree of freedom and I don't know where to start. There are (assuming only 1 oscillator operating):
1 - MiniSoundLab: there is the Osc-1 Frequency Pot
2 - MiniSoundLab: there is the Osc-1 1V/Oct 100 ohm mod trimmer
3 - Penfold P2: there is the VR2 Shift Pot control
4 - Penfold P2: there is the VR3 Gain Pot control
In his article, Penfold gives instruction for alligning the unit but doesn't say anything about the synth.
So far, where would you start from ? 
Bye
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| Overview of the board, its I/O and its controls |
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| This image has been reduced to fit the page. Click on it to enlarge. |
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Last edited by stefano on Tue Sep 04, 2007 4:44 am; edited 1 time in total |
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Chrometuna
Joined: Aug 14, 2006
Posts: 209
Location: Topeka
Audio files: 3
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Posted: Fri Mar 02, 2007 6:06 pm Post subject:
C19 ?
Subject description: Whats the big odd looking silver thing at C19? |
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On the picture of the populated PC board, there is this odd looking silver thing at C19 (I think) Is this just some odd looking capacitor? Is there something special about this cap?
Will I have hellish nigthtmares and 7 years of bad luck if I use a different kind of cap with the same values?
The picture is below, so you can see what I mean.
The parts list calls for a "Ceramic Capacitor .01uF C19 " And in the rest of the description page it call it a ".01 uF polystyrene cap C19"
Oh what ever shall I do?
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blue hell
Site Admin
Joined: Apr 03, 2004
Posts: 24651
Location: The Netherlands, Enschede
Audio files: 326
G2 patch files: 320
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Posted: Fri Mar 02, 2007 6:28 pm Post subject:
Re: C19 ?
Subject description: Whats the big odd looking silver thing at C19? |
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| Chrometuna wrote: |
Will I have hellish nigthtmares and 7 years of bad luck if I use a different kind of cap with the same values? |
Nope 
C19 looks like polystyrene in the image. Without knowing the schematics this could make sense as polystyrene is low leakage which makes sense for a keyboard's sample and hold storage capacitor.
If so, what will happen when you put in something with more leakage is that a note will drift away more after releasing the key. This could be bad for long note release times, but just try and see what happens, it might not be too bad, depending on what sort of music you'll want to make.
And it's easy to change when you don't like it anymore.
_________________
Jan
also .. could someone please turn down the thermostat a bit.
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synthmonger
Joined: Nov 16, 2006
Posts: 578
Location: flada
Audio files: 3
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| Posted: Sun Jul 15, 2007 5:37 am Post subject:
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| Soooooooooooooooooo how goes the P/V device? Still messing with it? |
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snufkin
Joined: Apr 06, 2007
Posts: 57
Location: the world
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| Posted: Sun Jul 15, 2007 11:11 am Post subject:
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i PMd
stefano
and he said he was still having problems
if any one has a better p to v project i would be very interested |
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stefano
Joined: Nov 23, 2006
Posts: 33
Location: ITALY
Audio files: 5
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Posted: Tue Jul 31, 2007 3:33 am Post subject:
P2V
Subject description: It Works |
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After messing a long time with the device I discovered that the unit tracks very well on higher frets (from 6th - 7th fret on). I'm going to record some samples.
Bye |
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stefano
Joined: Nov 23, 2006
Posts: 33
Location: ITALY
Audio files: 5
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Posted: Thu Aug 02, 2007 5:09 am Post subject:
 Penfold Guitar to Synth - SAMPLES
Subject description: war is over... |
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Hi,
as follows, there are the results of this little odyssey:
The first file is the input guitar.
I played an H major scale, starting ftom the 10th fret of the 5th string.
1.ibanez_as_300_naked_scale.mp3
in this file I try to obtain a good gate/triggering of the unit (VR1 and VR4).
2.penfold_g2s_msl_scale_4.mp3
This file is a very well tracked scale ! .
3.penfold_g2s_msl_scale_5.mp3 
In this file I play one octave low the scale H major
4.penfold_g2s_msl_scale_one_octave_low_1.mp3
Now I add an L.F.O. with a little bit of noise (a bit of fun).
5.penfold_g2s_msl_scale_lfo_on_1.mp3
Let me know your thoughts/opinions.
Bye
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penfold_g2s_msl_scale_5.mp3 |
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penfold_g2s_msl_scale_4.mp3 |
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ibanez_as_300_naked_scale.mp3 |
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Last edited by stefano on Tue Sep 04, 2007 4:38 am; edited 1 time in total |
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Wild Zebra
Joined: Apr 28, 2005
Posts: 806
Location: Ohio
Audio files: 5
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| Posted: Thu Aug 02, 2007 7:18 am Post subject:
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Great work! glad to see it's all come full circle. The samples prove well. I have a Korg X-911 never really put anything into the fm input. I'll have to break it out and run a LFO into it tonight.
Nice 
_________________
"your stripes are killer bro" |
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snufkin
Joined: Apr 06, 2007
Posts: 57
Location: the world
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| Posted: Thu Aug 02, 2007 12:01 pm Post subject:
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YES!
i am in the process of building one now 
cool samples |
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goodrevdoc
Joined: Sep 11, 2006
Posts: 288
Location: Philadelphia, PA
Audio files: 1
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| Posted: Thu Aug 02, 2007 5:48 pm Post subject:
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Hey great work stefano. Thanks for the samples. They seem to convey the realistic possibilities of this circuit.
-justin |
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StephenGiles
Joined: Apr 17, 2006
Posts: 507
Location: England
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stefano
Joined: Nov 23, 2006
Posts: 33
Location: ITALY
Audio files: 5
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| Posted: Tue Aug 21, 2007 9:06 am Post subject:
after the crash |
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| just a try |
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synthmonger
Joined: Nov 16, 2006
Posts: 578
Location: flada
Audio files: 3
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| Posted: Sun Aug 26, 2007 3:25 pm Post subject:
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| Getting a 404 ;X |
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markusw
Joined: Jun 16, 2007
Posts: 23
Location: Vienna/Austria
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| Posted: Fri Aug 31, 2007 4:43 am Post subject:
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What do you think about the approach shown on page 14 in this file?
http://www.moogmusic.com/manuals/HotRodEtherwav.pdf
It is supposed to be fast and accurate...
For use with guitar it of course would at least need some low pass filtering or probably better a decent fundamental extractor...
Regards,
Markus |
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markusw
Joined: Jun 16, 2007
Posts: 23
Location: Vienna/Austria
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| Posted: Fri Aug 31, 2007 9:24 am Post subject:
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Hey Stefano,
could you please reupload your mp3?
Thanks a lot in advance!
Markus |
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Chrometuna
Joined: Aug 14, 2006
Posts: 209
Location: Topeka
Audio files: 3
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| Posted: Fri Aug 31, 2007 1:57 pm Post subject:
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I just got back from a tour and now have time to finish my 1v/oct thing.
My question is:
Obviously if I used an old bass as the 'keyboard' (String and frets are the switches) then I can only have one string acting as the keyboard.
How can I use each separate sting?
Or would I have to build a separate 1v/oct controller for EACH string?
Is there a way to matrix the thing to combine all of the string/fret switches into ONE signal that the control hears then translates?
Am I making any sense? |
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stefano
Joined: Nov 23, 2006
Posts: 33
Location: ITALY
Audio files: 5
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| Posted: Tue Sep 04, 2007 4:41 am Post subject:
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Samples reloaded.
Bye
| markusw wrote: | Hey Stefano,
could you please reupload your mp3?
Thanks a lot in advance!
Markus |
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markusw
Joined: Jun 16, 2007
Posts: 23
Location: Vienna/Austria
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| Posted: Tue Sep 04, 2007 5:54 am Post subject:
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| Quote: | Samples reloaded.
Bye |
Thanks a lot!!
Regards,
Markus |
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