MixBuzz1 Build/Support thread

[Igor]

Got some mails. Lazy. But here are photos

Pictures of stepped units I did some time ago. Can be helpfull. Have a fun!

The album:

http://s251.photobucket.com/albums/gg291/diy33609/stepped%20mixbuzz1/

Stepped attack/release (was asked 5 times at least by mail):

http://www.groupdiy.com/index.php?topic=41654.msg573975#msg573975

Using DBX202C gold can VCA's in MixBuzz1:

DBX 202C GOLD CANS
RXX APPLY TO BOTH L AND R (R100L, R100R)
R6 40K2
R2 1MEG...1.5 MEG
R100 710R
R4 JUMPER/FERR BEAD
R3 40K2
C1 5PF


Porn:

 

[chefducuisine]

Second MixBuzz up and running here - bit different (nu VU, switches for attack and release) to my first one...

Here you can see the difference to the first one:

 

[baadc0de]

Looking great!

 

[canidoit]

Really dig your designs and clean wiring on your mixbuzz chefducuisine. The led metering in the middle area for the first mixbuzz looks misaligned.

 

[ilfungo]

sorry
someone can tell me how to connect stepped switches for mix (DRY - WET)
I had a double potentiometer mounted but I would make a version with steps
thanks

 

[Igor]

chefducuisine:

Cannot stop watch this roboporn!!!!!! What a chick!!!!!

ilfungo: dry-wet switch, take a look on pcb, all is written.

Very important update.

Due to 90% of people who built this compressor did it with 11 steps attack and release switches, the new PCB's are done by this way.

All is same, but easier wiring.

http://ij-audio.com/downloads/MB1_docs_2_5.rar

+12V regulator's heatsink was changed to bigger one.
LM3914 LED current setting resisters were changed to lower power consumption too.

In case of whatever: use 12V relays with 700Ohm...2kOhm coil resistance, to reduce current consumption.

Front for use with Uraltone 23-step switches (the controls are bit moved to get space for 23-pos switches):

http://ij-audio.com/downloads/mb1_2_5ver9cdr.cdr

(saved in Corel version 9)

 

[cstella]

Got my boards yesterday! Thanks Igor!

Really looking forward to building this one.

 

[Igor]

Mm... Yep! The next step is digitally conroled MixBuzz1!
Not kidding, BTW.  Any interest? Please post here:

http://www.groupdiy.com/index.php?topic=29771

Let's keep this thread clean for troubleshooting and tech-stuff hardcore

 

[late]

Hi

Anyone have that excel bom by evilcat? Link not work.

Email it to me, please: lassi.pitkanen (at) wmail.fi

 

[cstella]

email sent!

 

[100WChris]

Hi Mixbuzz-Builders!
I want to build the mixbuzz in a 1HE-case but i have trouble finding the 2200uF 50V Caps Low ESR with a height that fits...
All i can find is the Panasonic-Cap, but it´s 38mm and thats to much.
What did you use?
Or: is it save to use a 2200uF/ 35V-Cap? I have three that would fit...
Thanks
Chris

 

[Igor]

Or: is it save to use a 2200uF/ 35V-Cap?

Yes, if you use 2x18V AC power transformer. The voltage on caps will be within 25-30V, and it is OK.

 

[100WChris]

Thank you Igor!
I use a 2x18V power-Trafo
One last question, just to be sure and because i have some trouble understanding it. My trafo reads:
Prim: black, black (thats clear, i understand this)
Sec I: red, yellow
Sec II: blue green

If i understand you right...

"For 18-0, 18-0 transformer (two secondary's):
Connect 18 of one secondary to 0 of other secondary and to CT at power supply PCB
(this is the central point of 18-0-18); than, 18 goes to ~18.1; 0 goes to ~18.2. Hope it is clear."

...I have to wire the Trafo like this?

Red and Green go to CT
Yellow goes to 18.2
Blue goes to 18.1

EDIT Or: Red to 18,1, yellow and Blue to CT, green to 18,2...
I think i got it

It´s probably a dumb question. Sorry...
Chris

 

[Igor]

Blue/green/etc does not says anything. We need start/end of windings.
To avoid guessing. First, sheck if there is a datasheet of transformer.
Than, sec1 + (or start) connected to sec2 - (or end) and this is CT.
If there is no datasheet of transformer, use inductance meter.
Disconnect trafo from everything; measure one secondary; than connect secondarys;
if they connected right, summary inductance will be 4 times higher than single secondary.

 

[Igor]

Hi Mixbuzz1 enthousiasts!
Some days ago I started assembling the boards for my complete mixbuzz1 build.
So far most of it is pretty clear.
Exept that with the parts I ordered from Igor I got the 23 step potmeters with a lot of resistors.
Is there somebody that could shine some light on how the resistors go in the potmeters in the correct way, and how to wire them properly?
I couldn't find much about it. I'll keep you updated in my progress!
Cheers!

Check some posts before, you have pictures of 2 units with stepped switches.
Solder resistors to switches to get stepped linear 10k pot. I think it is clear.

 

[ilfungo]

2x18v 30VA is right?
Thanks

 

[jandoste]

2x18v 30VA is right?
Thanks

yep

 

[Igor]

One of dudes (he isn't a member of our forum) asked for Mouser/Farnell or Digikey part list.
I used to buy the parts from local suppliers, taking best of their stock, and the rest is usually Fasrnell order.
But, maybe, somebody have a parts list in organized form with cat nr's to help him?

 

[evilcat]

Yes, I have something like that: an excel BOM, with mostly Mouser part. Lot of member emailed me and I send them the file. Does anyone have an idea where I can host it?

Ben

 

[Igor]

Woa! Dats sounds cool, Ben. Please send it to igor_jazz at yahoo, I will host it at ij-audio.com/downloads