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kkissinger
Stream Operator
Joined: Mar 28, 2006
Posts: 1434
Location: Kansas City, Mo USA
Audio files: 45
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 Posted: Fri Nov 19, 2010 5:34 am Post subject:
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| fonik wrote: | 
that demonstration is awesome!
BTW did you try the VCmodulator for control voltages as well? |
Thanks!
I will try out some control voltages with it and I'll let you know how it works out.
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http://kevinkissinger.com |
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brother303
Joined: Nov 02, 2010
Posts: 139
Location: ruhr-area/germany
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| Posted: Fri Nov 19, 2010 7:38 am Post subject:
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Hi Fonik,
one question on the power supply : 12V possible without changes in any values? Schematics says "15V".
Best regards
Greg |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Fri Nov 19, 2010 1:39 pm Post subject:
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will work with 12V without any modifications.
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matthias
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
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| Posted: Fri Nov 19, 2010 6:41 pm Post subject:
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A couple photos. Thanks so much for sharing this module!
Edit - not sure why they're being rotated when I attach them.
| Description: |
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1.54 MB |
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653 Time(s) |
| This image has been reduced to fit the page. Click on it to enlarge. |
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| Description: |
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1.71 MB |
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625 Time(s) |
| This image has been reduced to fit the page. Click on it to enlarge. |
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brother303
Joined: Nov 02, 2010
Posts: 139
Location: ruhr-area/germany
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| Posted: Sat Nov 20, 2010 1:12 am Post subject:
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Hi,
| fonik wrote: | | will work with 12V without any modifications. |
Thanks lot! |
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crashlander42
Joined: Oct 21, 2006
Posts: 292
Location: Orlando, FL (US)
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
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brother303
Joined: Nov 02, 2010
Posts: 139
Location: ruhr-area/germany
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| Posted: Thu Nov 25, 2010 7:05 am Post subject:
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Hi,
pcb arrived safely,thanks for fast shipping!
Best regards
Greg |
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XCenter
Joined: Oct 01, 2005
Posts: 113
Location: Germany
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| Posted: Thu Nov 25, 2010 8:15 am Post subject:
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Same here. 
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TekniK
Joined: Aug 10, 2008
Posts: 1059
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| Posted: Fri Nov 26, 2010 12:28 am Post subject:
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| crashlander42 wrote: | | I wish I ordered two of these. It sounds great! |
May i ask you where you did buy the knobs with orange and white caps? |
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XCenter
Joined: Oct 01, 2005
Posts: 113
Location: Germany
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| Posted: Sun Dec 05, 2010 8:43 am Post subject:
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Mmh, can´t find the 2N3908 transistor at any standard supplier I usually order from. Maybe s.o. could give me a tipp here? I´m located in Germany. Thx.a lot.
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Dego
Joined: Apr 22, 2008
Posts: 139
Location: Sweden
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| Posted: Sun Dec 05, 2010 10:31 am Post subject:
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| XCenter wrote: | | Mmh, can´t find the 2N3908 transistor at any standard supplier I usually order from. Maybe s.o. could give me a tipp here? I´m located in Germany. Thx.a lot. |
2n3906... |
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XCenter
Joined: Oct 01, 2005
Posts: 113
Location: Germany
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| Posted: Sun Dec 05, 2010 10:50 am Post subject:
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Is this a substitute to the 08 or have I missed s.th.?
...
[edit]
Doooh! Thx for opening my eyes. It HAS to be the 2N3906. 
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tommi
Joined: Dec 05, 2007
Posts: 247
Location: Italy
Audio files: 3
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Thu Dec 16, 2010 7:37 am Post subject:
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i found that one could improve the range of potentiometer P4 by connecting the CCW (pin1) via a 10k to GND.
if you use the module for audio in the first place, you could even solder a 100k resistor across CW and wiper (pins 3 & 2) of the potentiometers (P3 & P4).
| tommi wrote: | Why am I always late for fonik PCB offers? 
I 'll go with stripboard as usual... |
sorry. 
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matthias
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tommi
Joined: Dec 05, 2007
Posts: 247
Location: Italy
Audio files: 3
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| Posted: Fri Dec 17, 2010 2:44 am Post subject:
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| Quote: | i found that one could improve the range of potentiometer P4 by connecting the CCW (pin1) via a 10k to GND.
if you use the module for audio in the first place, you could even solder a 100k resistor across CW and wiper (pins 3 & 2) of the potentiometers (P3 & P4). |
Thanks. I'll add these little changes on the stripboard!
It would have been easy adding these changes to the PCB too
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Fri Dec 17, 2010 3:09 am Post subject:
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| tommi wrote: | | Quote: | i found that one could improve the range of potentiometer P4 by connecting the CCW (pin1) via a 10k to GND.
if you use the module for audio in the first place, you could even solder a 100k resistor across CW and wiper (pins 3 & 2) of the potentiometers (P3 & P4). |
Thanks. I'll add these little changes on the stripboard!
It would have been easy adding these changes to the PCB too |
true. however, you actually could do these changes off board at the potentiometers.
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matthias
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tommi
Joined: Dec 05, 2007
Posts: 247
Location: Italy
Audio files: 3
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| Posted: Fri Dec 17, 2010 3:20 am Post subject:
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| Quote: | | true. however, you actually could do these changes off board at the potentiometers. |
Not to be honest, because I choosed to use pcb mounted pots. I choose that way to reduce the number of cables running from the board to the panel mounted components for a cleaner build 
Anyway I'll put those resistors on the board.
But I planned to mount R3,4,7 and 8 on the jacks and this will make the stripboard less crowded (and less deep).
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tommi
Joined: Dec 05, 2007
Posts: 247
Location: Italy
Audio files: 3
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| Posted: Mon Dec 27, 2010 3:20 am Post subject:
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I got my stripboard version working now! I posted pictures on the 2010 build thread. After some troubleshooting due to brutal mistakes, such as forgetting one resistance and putting all trannies backwards (!). Watching fonik's pcb i realized that 2n3906's pinout is the opposite of what i decided it was..
I am not sure about how to calibrate this module.
I don't have a scope so i just followed the procedure told by fonik on page 7:
-with no signal applied and all pots down exept for carrier initial wich is fully up, I turn the trim (T1) until i got 0V at TP1.
The same procedure for the modulator signal.
So in both cases i got 0V at Test Point when the 'initial' pot is fully up and about - 1,2V when that pot is fully down. Is that ok?
There is some bleedthru between channels when i mixed two audio signals.
When i mix two DC signals (i tried with CV out from a sequencer and a sine wave from an lfo), bleedthru (from lfo's sine) is much more evident.
I am not sure if my calibration is ok and just wanted to share my experience..
cheers
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Mon Dec 27, 2010 9:04 am Post subject:
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| tommi wrote: | So in both cases i got 0V at Test Point when the 'initial' pot is fully up and about - 1,2V when that pot is fully down. Is that ok?
There is some bleedthru between channels when i mixed two audio signals.
When i mix two DC signals (i tried with CV out from a sequencer and a sine wave from an lfo), bleedthru (from lfo's sine) is much more evident. |
all is okay, even the bleedthrough. you cannot expect VCA action from this design anyways...
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matthias
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tommi
Joined: Dec 05, 2007
Posts: 247
Location: Italy
Audio files: 3
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| Posted: Mon Dec 27, 2010 9:21 am Post subject:
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| Quote: | | you cannot expect VCA action from this design anyways... |
That's right! Anyway this module have its own character and me too i was hit by the demo of kkissinger!
Any suggestion about some interesting patch that modulates two DC signals?
cheers
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the_ufo
Joined: Nov 02, 2010
Posts: 15
Location: edinburgh
Audio files: 1
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| Posted: Mon Jan 31, 2011 8:27 am Post subject:
what to do |
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| i've soldered over some of the holes and the braid isn't removing the solder... help? |
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softfin
Joined: Oct 11, 2006
Posts: 271
Location: Far in the north
Audio files: 1
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| Posted: Mon Jan 31, 2011 9:53 am Post subject:
Re: what to do |
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| the_ufo wrote: | | i've soldered over some of the holes and the braid isn't removing the solder... help? |
Sounds like a situation where a desoldering pump would come in handy.  |
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the_ufo
Joined: Nov 02, 2010
Posts: 15
Location: edinburgh
Audio files: 1
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| Posted: Mon Jan 31, 2011 10:55 am Post subject:
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| thankyou! |
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emdot_ambient
Joined: Nov 22, 2009
Posts: 667
Location: Frederick, MD
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| Posted: Tue Feb 01, 2011 3:34 pm Post subject:
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Yep, desolder pump is your friend. Best purchase I've made for DIY (next to a somewhat decent soldering station). Desolder pumps can be a bit of a pain--you've got to keep them cleaned out--but they're WAY better than desoldering braid. Less potentially damaging as well.
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