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Got a good question by e-mail and like to share it:
Will a dbx 202xt work fine in the unit? I can get a pair of them. Would the input resistance be different from the 202x?
According to 202XT datasheet, voltage control constant is -20db/volt, same as 202x.
Input impedance is 1k25/same again. Control port impedance is 810...832R, by datasheet, it is same as 202x....
DBX202XT has different control schematic than 202X, it use both inverting and non-inverting ports of VCA's.
IMHO, bit useless...anyway, so they did :)
Try R6=3k74, R3=4k99, R100=909R. IMHO this will work fine.
 
I never tried 202XT, but 99.9% yes.
X and XT using different schematics for control port,
in XT version, control voltage goes to both + and - control ports of VCA's
(inverted to EC- and non-inverted to EC+).
 
Hi.
Please excuse some noob questions. I'm in the UK and I'm having trouble sourcing some parts. Farnell's site always wants to direct me to their US supply for lots of the parts, and don't seem to have some parts in the right size. e.g. control PCB C30/31 220UF in 2.5mm pitch.
UK people, who do you look to first for components?

I was going for Panasonic for the general electrolytics, is there a particular series I should be looking for? and how about for the audio grade electrolytics? Panasonic again, or Nichicon or?

Jensenmann, do you mean the docs for Mixbuzz? I saw them still up there earlier? I can email them to you if you pm me.

Thanks and apologies...
 
C30/C31 can be 3.5mm pitch, 8 mm diameter as well. Will fit fine.

I like these caps (again, personal taste, your choice can be different:
http://il.farnell.com/jsp/level5/module.jsp?moduleId=en/388706.xml
http://il.farnell.com/jsp/level5/module.jsp?moduleId=en/438036.xml
 
@jensenmann: strange...it works now!
In case you need docs to be sent to your mail, feel free to email/pm.
 
Igor said:
C30/C31 can be 3.5mm pitch, 8 mm diameter as well. Will fit fine.

I like these caps (again, personal taste, your choice can be different:
http://il.farnell.com/jsp/level5/module.jsp?moduleId=en/388706.xml
http://il.farnell.com/jsp/level5/module.jsp?moduleId=en/438036.xml

Thanks Igor I'll get back to filling the order form....

Farnell's site is sloooooow

AG
 
Received the MixBuzz today...this sunny day. Like clockwork...as usual Igor. :)
 
AudioGimmer said:
Igor said:
C30/C31 can be 3.5mm pitch, 8 mm diameter as well. Will fit fine.

I like these caps (again, personal taste, your choice can be different:
http://il.farnell.com/jsp/level5/module.jsp?moduleId=en/388706.xml
http://il.farnell.com/jsp/level5/module.jsp?moduleId=en/438036.xml

Thanks Igor I'll get back to filling the order form....

Farnell's site is sloooooow

AG
Digikey list these Panasonic caps under "M" series
 
hi,soon i 'll have to calibrate the unit

i did it like that

DBX202X has internal resistors on inputs 8x10K, than, .
Control port impedance is 832 Ohm. I.e. R4=3k74, R3=4k99, R100=909R.

THAT2180C, don't install SC_SYM trimpot and R33.
There's no need for A version VCA in sidechain.

Sidechain trimpot (RV1) on audio PCB: changes threshold point... install 5k1 and forget.
Threshold trim (TR_TRM): changes threshold zero. Omit (install nothing) and forget!!!

well just need:Audio: adjust for 0.0 mV DC at IC11b, NE5532, pin1 it's trimmer SYM right?

could i calibrated it one board audio by one without controle board if not one by one with controle board?

cause i'll used the card edge connector linked to 51X prototyping PCBs
IMG_5902.jpg


thanks




 
zayance said:
Hi,
What are the specs of the Elma knobs you used in this build?  I'm looking to order some. Thanks!

No Elma here, Lorlin and Bourns, documents (BOM etc...) can be found on first page.

I believe Igor used Elma knobs (not switches) for his build.  I am a noob, I wanted to know where to source those knobs.
Thx.
 
I believe Igor used Elma knobs (not switches) for his build.  I am a noob, I wanted to know where to source those knobs.
Thx.

Oh excuse my french, i mismatch knobs with pots  ::), yes elma knobs, well Farnell has black ones and some in grey, you have to choose the cap color and with or without line, or arrow on the bottom, just put Elma in the search field, and i found a swiss distributor that has most of them, but never dealed with them yet, www.distrelec.ch, you need to choose your county tough, price changed according to that, better to live in EU.
 
zayance said:
I believe Igor used Elma knobs (not switches) for his build.  I am a noob, I wanted to know where to source those knobs.
Thx.

Oh excuse my french, i mismatch knobs with pots  ::), yes elma knobs, well Farnell has black ones and some in grey, you have to choose the cap color and with or without line, or arrow on the bottom, just put Elma in the search field, and i found a swiss distributor that has most of them, but never dealed with them yet, www.distrelec.ch, you need to choose your county tough, price changed according to that, better to live in EU.

C'est pas grave!  :)  I'm finding it very difficult to find a lot of audio electronic parts here in Ontario.  I'm sure some of you Ontarians on this forum could chime in with info, it would be greatly appreciated.  The best around here is Sayal, but their selection is limited.  I'm sure there's some hidden Gems in Toronto.
 
well just need:Audio: adjust for 0.0 mV DC at IC11b, NE5532, pin1 it's trimmer SYM right?
If everything assembled ok, yes :)

could i calibrated it one board audio by one without controle board if not one by one with controle board?
Yes, to check if the audio path is OK it is enough.
To check the compressor, everything-both audio boards
and control board - should be powered!


cause i'll used the card edge connector linked to 51X prototyping PCBs
Of course.

I'm finding it very difficult to find a lot of audio electronic parts here in Ontario.
I didn't used any exotic parts. Most of stuff available from Mouser/Farnell/Digikey.
THAT chips, meter and ELMA knobs, are all available from Farnell/Newark.
Please let us know what parts are hard to source for you.
 
stereokillah said:
cause i'll used the card edge connector linked to 51X prototyping PCBs
IMG_5902.jpg


thanks

Hey Stereokillah.

Do you have many spare edge connectors like in the picture? I'm building my mixbuzz for a 6 slot lunchbox and it's tight in there. They'd be handy for making a testing setup.

AG
 
Please PM me, I did some test PCB's like on the picture.
Can send a pair on request for free, just pay shipping cost.

 

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