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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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 Posted: Sat Aug 28, 2010 10:41 am Post subject:
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| LektroiD wrote: | | Does this mean you're no longer making this module (or others) available for DIY? |
 no!
since the publishing of the prebuilt module i did the VCPS-8 PCB, and i am currently working on the CV ringmod PCB 
i just wanted to try out offering a professional built complete module. it worked out well and i will offer more, i believe. however, DIY rules!
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matthias
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sonicwarrior
Joined: Dec 22, 2005
Posts: 266
Location: Cologne, Germany
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| Posted: Thu Oct 21, 2010 1:10 pm Post subject:
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| fonik wrote: | | the board is not changing. i just replace R30 by a Z-diode. oh, and i incorporated the missing 100k resistor to GND for the AC mode - but i didn't change anything to the actual boards layout or part numbers. |
What about updating the rev2 documentation to include the Z-diode as an option?
Are the 10nF ceramics critical or is it safe to use e.g. 22nF or 47nF instead?
I have currently no 10nF lying around but I want to finish soldering my boards. |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Thu Oct 21, 2010 1:28 pm Post subject:
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| sonicwarrior wrote: | Are the 10nF ceramics critical or is it safe to use e.g. 22nF or 47nF instead?
I have currently no 10nF lying around but I want to finish soldering my boards. |
IMHO it is not that critical. it is for filtering noise, and taking the tolrances into account i would say it is oky to use a 22uF.
anyways, i think i need much more knowledge about all this filtering and decoupling stuff - wouldn't this be a great issue for an thread in the main DIY forum?
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matthias
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sonicwarrior
Joined: Dec 22, 2005
Posts: 266
Location: Cologne, Germany
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| Posted: Thu Oct 21, 2010 2:06 pm Post subject:
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| Then I'm curious why you chose 10 nF caps instead of the usual 100 nF. |
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mark_olson
Joined: Oct 26, 2006
Posts: 177
Location: Lawrence, Kansas
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| Posted: Thu Oct 21, 2010 2:26 pm Post subject:
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| fonik wrote: | | ...i need much more knowledge about all this filtering and decoupling stuff - wouldn't this be a great issue for an thread in the main DIY forum? |
Indeed it would! Just two nights ago I was breadboarding a circuit and found myself wishing I understood decoupling better. 
Mark |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Thu Oct 21, 2010 3:31 pm Post subject:
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| sonicwarrior wrote: | | Then I'm curious why you chose 10 nF caps instead of the usual 100 nF. |
because i had them ;-P
(you will find both versions in various of designs around here)
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matthias
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sonicwarrior
Joined: Dec 22, 2005
Posts: 266
Location: Cologne, Germany
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| Posted: Thu Nov 04, 2010 1:04 pm Post subject:
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Regarding the Zener:
The direction is towards R29 (black line)? |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Thu Nov 04, 2010 3:37 pm Post subject:
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| sonicwarrior wrote: | Regarding the Zener:
The direction is towards R29 (black line)? |
yes. replace R29 by a 1k, and replace R30 by a Zener from GND to R29
(GND -->|-- R29). this will clamp the 15V down to the Zener value.
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matthias
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sonicwarrior
Joined: Dec 22, 2005
Posts: 266
Location: Cologne, Germany
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| Posted: Sat Nov 06, 2010 8:22 am Post subject:
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Ok, thanks.  |
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jnuaury
Joined: Feb 28, 2008
Posts: 161
Location: chicago
Audio files: 9
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| Posted: Tue Dec 07, 2010 7:12 pm Post subject:
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if i dont have trimpots, what would be the best value to replace the trimpot and the 10k resistor before it? 50k?
thanks
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Wed Dec 08, 2010 12:32 am Post subject:
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| jnuaury wrote: | | if i dont have trimpots, what would be the best value to replace the trimpot and the 10k resistor before it? 50k? |
no. the best value would be the actual value of the potentiometer. so match the resistor to the pot (potentiometers have quite a huge tolerance...
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matthias
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RSFC
Joined: Sep 02, 2010
Posts: 63
Location: space lab
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| Posted: Sat Feb 05, 2011 7:32 pm Post subject:
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| Am I right to think I could use a 3PDT as opposed to a 3PST just wired differently? PST's are f*ing expensive from mouser while PDTs aren't too bad... |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Sun Feb 06, 2011 6:18 am Post subject:
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you are correct.
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matthias
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tazer
Joined: Oct 18, 2010
Posts: 49
Location: UK
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| Posted: Thu Apr 14, 2011 10:56 am Post subject:
attenuverting mixer pcb |
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please please please can you do a small run of these when you do the 4046 vco pcb run-i would so appreciate that i have been trying to track this pcb down to no avail-I'm sure others would be interested also, my modular isn't complete without it
I would certainly take a few pcb's of this mixer, see what you can do...............
many thanks
Ian |
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