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 Forum index » DIY Hardware and Software » fonik's place
5-channel Attenuverting Mixer 2nd run
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fonik



Joined: Jun 07, 2006
Posts: 3755
Location: Germany
Audio files: 23

PostPosted: Sat Aug 28, 2010 10:41 am    Post subject: Reply with quote  Mark this post and the followings unread

LektroiD wrote:
Does this mean you're no longer making this module (or others) available for DIY?

Laughing no!
since the publishing of the prebuilt module i did the VCPS-8 PCB, and i am currently working on the CV ringmod PCB Wink
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: 224
Location: Cologne, Germany

PostPosted: Thu Oct 21, 2010 1:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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PostPosted: Thu Oct 21, 2010 1:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

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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sonicwarrior



Joined: Dec 22, 2005
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PostPosted: Thu Oct 21, 2010 2:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

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

PostPosted: Thu Oct 21, 2010 2:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

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. Confused

Mark
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fonik



Joined: Jun 07, 2006
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PostPosted: Thu Oct 21, 2010 3:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

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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sonicwarrior



Joined: Dec 22, 2005
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PostPosted: Thu Nov 04, 2010 1:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Regarding the Zener:

The direction is towards R29 (black line)?
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fonik



Joined: Jun 07, 2006
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PostPosted: Thu Nov 04, 2010 3:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

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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sonicwarrior



Joined: Dec 22, 2005
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PostPosted: Sat Nov 06, 2010 8:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Ok, thanks. Smile
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jnuaury



Joined: Feb 28, 2008
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PostPosted: Tue Dec 07, 2010 7:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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PostPosted: Wed Dec 08, 2010 12:32 am    Post subject: Reply with quote  Mark this post and the followings unread

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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RSFC



Joined: Sep 02, 2010
Posts: 63
Location: space lab

PostPosted: Sat Feb 05, 2011 7:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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PostPosted: Sun Feb 06, 2011 6:18 am    Post subject: Reply with quote  Mark this post and the followings unread

you are correct.
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tazer



Joined: Oct 18, 2010
Posts: 49
Location: UK

PostPosted: Thu Apr 14, 2011 10:56 am    Post subject: attenuverting mixer pcb Reply with quote  Mark this post and the followings unread

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 Wink

I would certainly take a few pcb's of this mixer, see what you can do...............

many thanks

Ian
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