MixBuzz500 build/support tHread

[Igor]

ok, the R4 3k74 was the cause of limiting now the unit work nice

MAN.... My congrats!!! You're fast!!!!

related problems:

- on ratio 2 the point of vu meter come to 8, cause of the diode D8 (for 4000 mode) D7 ( for gsll mode)in bad direction
- R34 & R40 burn the TL074 IC7 is in bad direction, change the resistor and the TL074
- SWITCH 3pdt on off on seems don't work, jsut link the three points ratings of the switch

In other words:

Check carefully if there's no components placed wrong. Check all resistor values.
Thanx again to Stereokillah, why not Sherlock Holmes?

I corrected 3rd post of this thread, BOM is right;
Put solder joint to pads near the 3pdt switch;
Thanx to 10R resistors, they acts as fuses if op-amp placed in wrong direction

Another thing. Regarding this thread:
http://www.groupdiy.com/index.php?topic=39897
Be careful when placing the unit inside 51x rack not to short power supply rails.
It is really hard to do: I tested MixBuzz500 in both 51X and Lunchbox racks),
but...who knows, everything possible.
For future, I will do all my 500/51x stuff with "slotted" connector.

 

[stereokillah]

thank you for this great projetc

Sherlock Holmes ???
why because he had a pipe  ;D

i prefer Colombo because Appearances are deceptive, and he have always a  cigar  

 

[Igor]

Thank you! Really, I very impressed.
Are you cigar smoker?
BTW, did you checked the ratios? And, please let us know about sound.

 

[stereokillah]

i did'nt  realy have time to check the performance, i've added trimpot for threshold , very interisting and i think to calibrate it, it's just as your feelµ.
i need to move all my material during this week, i'll check all after in good condition.

Are you cigar smoker?

no some times cigario

 

[Igor]

Cool! Looking forward.

 

[oceres]

;D can't wait to start building this baby! I'm so excited

I'm sourcing parts at the moment and I've no idea which leds to buy... there's too many of them lol

lamp size 5mm / T-1 3/4 ? forward current? Is it ok to use flat-top for the 3mm led?

 

[Igor]

;D can't wait to start building this baby! I'm so excited

I'm sourcing parts at the moment and I've no idea which leds to buy... there's too many of them lol

lamp size 5mm / T-1 3/4 ? forward current? Is it ok to use flat-top for the 3mm led?

Yes, it is OK for 3mm flat top led. Will look neat.
Regarding the VU illumination LED's. Easy way is to check at your local
electronics store for brignt LED's.
Or, search supplier for filters: led, 5mm, 1500-5000 mcd brightness, pcb mounting, 10...30 deg, etc, like here:
http://il.farnell.com/jsp/search/browse.jsp?N=500004+1004334+543666+373739+463779+373740+373741+5116075+356266+567790+578218+578818+578805+578802+578796+578790+578772+578766+578755+578748+5075942+578728+578724+578363+578373+578383+578392+578416+578423+578431+578436+578461+578475+578487+578493+578514+578523+578556+578572+578603+578646+578655+578675+578709+578720+5368163+5368166+5368176+5368172+5368179+5368183+5368140&Ns=PRICE_PLS_017_PRICE1|0&Ntk=gensearch_001&Ntt=led+5mm&Ntx=mode+matchallpartial&locale=en_IL&appliedparametrics=true&getResults=true&originalQueryURL=/jsp/search/browse.jsp%3FN%3D500004%2B1004334%26Ntk%3Dgensearch_001%26Ntt%3Dled%2B5mm%26Ntx%3Dmode%2Bmatchallpartial%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Den_IL%26catalogId%3D%26prevNValues%3D500004%2B1004334

 

[RedNoise]

Hi there here's a pic of my work in progress...

 

[Ryake]

Can't wait to get mine in the mail and get started. This will help me get my mind off the world cup being over  ;D

 

[Igor]

@Rednoise: superfast French DIY team!!!!! Cool. Very accurate.

OHHH!!!!! Don't remind me world cup. PLEASE!!!
It was impossible to drink beer at any pub there. Those football people!!!!
Those huge screens with running football robots!!!! GOOOL!!!!!!
Hell is other people, (c) Jean-Paul Sartre, I agree, but real hell is Word Cup. No way.
I was sooo happy it finished!  ;D :

 

[RedNoise]

Hell is other people, (c) Jean-Paul Sartre, I agree, but real hell is Word Cup. No way.

Especialy when you were french supporter for this one WC... :-\ ...Worst : my second blood is Italian... :-X

 

[Ryake]

The US was first in their group but France and Italy didn't even get out of their group. Very strange haha

 

[AudioGimmer]

Back to the mixbuzz questions....

1. What about pins for the VCA replacement boards to connect to the audio boards. Igor, did you just use resistor legs soldered to the VCA boards and then to the audio boards?

2. Sockets for the Thats VCA chips? Are there any off the shelf sockets for 8pin SIL?
Rednoise, what did you use? I see you have already got some soldered in there... [ and very neat work it looks too]

AG

 

[RedNoise]

Hi AudioGimmer!
Regarding That VCA sockets , I used SIL 32 cut @ 8 points...It worked fine in my GSSL so...ie :
http://cgi.ebay.fr/32-way-SIL-Socket-Header-Turned-Pin-Grooved-2-pack-/180530615923?cmd=ViewItem&pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item2a08769673
I intend to use 202X , not the VCA replacement boards , but : 1N4007 cut legs are a good and cheap pins

 

[AudioGimmer]

Hey RedNoise, those look perfect, merci beaucoup.

Soldering starts next week, I have some free time.....

AG

 

[RedNoise]

This build is a real pleasure to solder!!!I hope you'll enjoy it as I do !

 

[stereokillah]

hello guys, i would give you a small trick with ribbon.

cut 4 parts about 20cm put your connector on it and after calibration just cut in the middle two of this to have 4 ribbon for assembled the unit .

 

[Igor]

Already answered, almost nothing to add...
Diode legs etc are perfect for VCA replacement boards.
Replacement board with 4x2181B sounds really nice, worthy to try.
4x A grade VCA's IMHO overkill, I did not heard the difference between A and B grades.

hello guys, i would give you a small trick with ribbon.

cut 4 parts about 20cm put your connector on it and after calibration just cut in the middle two of this to have 4 ribbon for assembled the unit .

Excellent idea about ribbons!!!

 

[Brizco]

finished the mixbuzz today and tried to test it... but: R16 is burning on both audio boards! (R16 is 10R 1/2W)

now i have to look for the reason... every hint is welcome!

 

[Brizco]

finished the mixbuzz today and tried to test it... but: R16 is burning on both audio boards! (R16 is 10R 1/2W)

now i have to look for the reason... every hint is welcome!

found the mistake: both ina134 are defective!