Usefull EQ for mix - 8 in 6RU: pic porno/design

[jensenmann]

[quote author="Igor"]42![/quote]

:grin:

 

[Igor]

OOUUPS!!! F@cked up my 42's post!!!!
Will drink on my 42's post tomorrow in Rik's pub )

 

[outoftune]

that is gorgeous.

any chance of someone doing a run of these pcbs?

 

[smallbutfine]

Yep Igor,
you did it again (let us standing there with open open mouth and wide eyes).

Great work - and a generous offer to probably be of help getting pcb's for this!

Very appreciated!

Kind regards,
Martin

BTW I really like those Rifa MMK caps.

 

[tony dB]

:shock: :shock: :shock:

Speechless....

 

[Brad McGowan]

This think looks amazing and would be a great candidate for a channel strip EQ for this upcoming console:

http://www.gearslutz.com/board/high-end/143025-new-chandler-mixer-picture-warning-not-shipping-taking-orders-yet.html

Igor, do you think you could make a BOM available?

thanks,
Brad

 

[asm]

is it possible to post up your frontpanel layout in an .EPS/.AI vector, ect so i could see if its possible to screenprint myself?

thanks! awesome project. really respectful. :guinness:

 

[outoftune]

igor, which sontec is this specifically based on? i noticed your pcb says mep-250, which specific revision of the 250? there doesn't seem to be much info out there about sontec, im curious as to what the different letter revisions in the name mean.

and i guess the 8200 number is a reference to the massaboog shelf option?

 

[Igor]

Hmmm... The whole idea is to make 8 eq's for mix. It is not based on discrete opamps, as Sontec/Masabug. But have same circuit , same filters
for three lower bands, and nice high shelf (6/12 db switchable) for high band. Difference beetween Sontec and Masabug filters are resistors/capacitors values. Anyway, see schemo and photos,
they will answer the questions bettre than me.

 

[suprughetto]

:thumb:
I quit!

 

[codered]

[quote author="Igor"]Ok, Corel Draw file have next layers:
LSR laser paths for lettering
FRAME laser paths for rectangles
NUMBER are numbers added in hurry to laser paths after I understood something strange: how to recognize channels? ))

32 3.2 mm tool depth=pannel depth
2_3 2.3 mm tool depth=pannel depth
FIN is path for 3mm tool depth 1mm (not necessary) to finnish 3mm holes
for this stuff holding pcb (sorry, don't know english word),
anyway, psb's holds excellent just on gain pots.

CENTERS pcb layout for reference.

I used Corel9 and converted into plt for g-codes.
My Corel understands 1016 plt standard, but in g-code interpreter
have to scale plt by x25.

Anyway, you have to get right dimensions, just group and measure
reference pcb layout, it have to be 81.28x249.55,
81 is due to xlr/jack packages bit out of pcb.

Actual pcb size is 79.5x249.5 mm.

Box depth should be 80 mm after front pannel or more.

Knobs are Elma 10mm-3.16 mm collett for Q pots,
possible to use wingknobs on low shelf, 14.5mm-6mm collet for freq, wingknobs 14.5-6mm collett on gains..[/quote]

Igor,
Thanks for the info.Seems like you are an expert in mechanical stuff too!!(I am transferring the discussion from Blackmarket to here)
Well I think my conversion is good..I'm getting PCB size 79.38 x 249.56
Please see the pic here:

http://twin-x.com/groupdiy/displayimage.php?pos=-1684

So I think there could be a problem in the dimension I indicated before:

1.Slot for shelving switch
2.Hole for Q pot.

This time I turned all layers on.

I took the file to a CNC place for trial engraving(actually my friend's dad's place).Since the engraving tool is V shaped,there are actually two lines being formed in a single cut.He recommended me to modify the letters with "stick fonts" because the Corel fonts have multiple lines.I guess it is OK on your laser because it has good accuracy like 0.25mm but the accuracy is not as good on a CNC machine with engraving tool.
Could you guide me how to get the frequency & Q scales..like 1degree= how many Hz.gettting little confused with log involved.
Thanks for this project & hope I didnt scare you with a lot of questions :grin:

 

[Igor]

Hello Codered, just take 8200eq' front pannel template
for freq's -they using 100k revlog pos as well )
Frequency's are not in hz/deg, it is bit more freaky stuff,
there was even Formulae to calculate Sontec's freq's on this forum.
I measured frequencys on working unit (gain max, q max,
find with oscillator resonant freq, turn freq pot 30 deg, again).
Due to 10% tolerance on potentiometers freq's can very
slightly differ, but this is in range.
Alphastat pots have excellent balance beetween two halfs,
this is more important. I don't care if on 10k actual is 10.24k )

 

[codered]

Got you...I'll do just that

 

[analogical]

Has anyone made a run of these pcb's yet?

 

[CroatianSensation]

Do a search.
This one was done a while back..Purusha even made cases available on the Black Market.

Igor rocks!

The search is your friend! :wink:

 

[CroatianSensation]

Nope.
That's not the one I'm talking about.
I know about that one.
Purusha did a case in which all the Igor eq's (eight of them I believe) were mounted VERTICALLY. i specifically remember the case and the project.
I didn't build one but I know it's in here somewhere.

Search is your friend.

:thumb:

 

[CroatianSensation]

Here's what I came up with after doing a single search using IGOR:

http://www.groupdiy.com/index.php?topic=27110&highlight=igor

Here's one named "SONTEC 8 BUILD THREAD":
http://www.groupdiy.com/index.php?topic=28215&highlight=igor

Here's the group buy thread:
http://www.groupdiy.com/index.php?topic=24718&highlight=igor

The cases in the pictures were made by Purusha.

SEARCH IS YOUR FRIEND.

 

[analogical]

Thank you.

 

[seavote]

hi, im looking for a good EQ build and this looks like a good candidate. i've searched all the associated links and can not find any PCB artwork (or pcb sales). i got the impression igor was reluctant to make this easily available. understandable,many designs here have been used inappropriately. if anyone could point me in the right direction i'd appreciate the help

 

[Davo]

http://www.groupdiy.com/index.php?topic=29771.0

looks like he's got a number of em still available