MixBuzz1 Build/Support thread

[Luax]

Hi Guys,


while setting the ratios following Igor's instructions I got satisfying readings on the RATIO=10 setting and adjusted trimpot a little bit to get to the -8db that was needed.
However in the the second stage with Ratio=2 I got a reading that was 4.5 db lower than what the description suggests.

Any ideas what could have caused this?

[Trench Recordings]

Hi guys, finally building two of these. This is a tough build! A few questions so far.
 
Igor shipped R49 at 499K. The bom says R49 470K. Is this ok ?

Is 1N4002 ok for DP5, DP6, DP7, DP8 ? BOM says 1N4004 to 1N4007

Also how closely matched do the 20K resistors have to be on the quad 2181 vcas? The all measured 20.3K or so. One out of the bunch was 19.6k

Thanks,
Dave

[solderboy]

hello together!

i startet right now and in the in the moment i try to get a overview. most seem clear, but i am a bit confused about attack/release right now. is it a 6 position switch in version 2.5? the boom say still it´s  poti. would be great to know before i order...

thanx and greetz from germany!

[mrcase]

use lorlin switches for attack & release. I used CK101X12

[mrcase]

 
my gr meter is still bonker.
I have no positive voltage for the meter. swapped opamps. if I turn the offset meter far enough I get a inversed GR meter reading.
seems like I hit a wall. what else could it be? is the gr voltage only positive after IC202A? I swapped this IC, btw.
it must be something simple, everything else is working just fine...
yours desperate
mrcase

[Harpo]

if I turn the offset meter far enough I get a inversed GR meter reading.

yepp. Just like an 1176.
No compression showing 0dB (with no signal at input, adjust trimmer GR_OFSL so the LEDs up to the 0dB LED show up).
When compressing, less LEDs show up to reflect the amount of gain reduction.

is the gr voltage only positive after IC202A?

Positive after IC202A with no audio signal present and less positive when GR takes place.

[mrcase]

aaahhrrgggh.
so it is supposed to work like that?  so essentially you only have the first LED bars showing GR?
at least on my frontpanel 0db is on the 1st led of the second bar. or could I just go from the very right LED to have a more detailed GR meter?

thanks for clearingthat up harpo!

[Luax]

The moment is finally there... I finished my mixbuzz.
There are still some small trimpots to adjust but everything seems to work without smoke, cracks and humms.
After some testing it seems to be a very delicate piece of gear.
Thanks to Igor (I wish you all the best with your health) and everyone else sharing their thoughts and experiences on the build.
Cheers!

[Trench Recordings]

Hey guys,

Ratio board... 4  x 3m9   MF 2% OR CAN BE CARBON, 5%   R.11, R.12, R.15, R.16

Igor shipped 4 x 3m3... is this ok ?

[chris77]

Just finished my Mixbuzz1,sounds ace!!  ,here's a pic

[Trench Recordings]

Wow that's some messy wiring  Congrats Chris

I hope to get mine up in a few days

[Trench Recordings]

Can someone explain how to wire up the 23 stepped switches with resistors? Looks like i have three switches for  Mix(C&B), Makeup and Threhold and a whole bunch of 499r resistors 

The lorlin switches for Attack, Rel, Ratio and SC Filter seem pretty straight forward into thier pcb board