norman_nomad

Sontec x 8 Build Thread
« on: June 17, 2008, 07:16:57 PM »
Hey Folks,

I just thought I'd start a build thread for those folks taking on Igor's 8 x Sontec project.

A couple of simple things that I stumbled on that you might benefit from after PM'ing Igor.

1.  If Igor gave you 1.5uf caps, you can use them in place of the 2.2uf caps in the low filter without any issue.  You can also use 1uf caps in the DC servo although 2.2uf is better.

2. You don't need the 150pf caps with the 604 or Forssel opamps

3. Channel bypass seems to work if you just link 1 and 3 on J6

4. The input/output 1 - 3 tags on the boards do NOT correspond to the XLR pins 1 - 3 (I stupidly assumed this).  Check the schematic for correct wiring.


Other than these things I had a very easy time with the build and actually managed to put the PSU inside of the case (all mounted against the back panel).

I tested one of the channels the other night and WOW what a great sounding EQ.  It's much like you'd expect.  Very clean and accurate sounding.  I think it will be a nice compliment to the more colored EQ's I have at my disposal.  

Thanks Igor for such a great project!  :grin:   :thumb:   :guinness:


I made some sound clips of unprocessed and processed... I'm using some meager Firebox converters to test, so they probably don't show the full potential of this EQ, but it will give you a general idea of what the EQ sounds like.  I also included clips with the 604's in the in/out position and some JLM99v's in the in/out for comparison.



Examples --> http://www.musicianssamples.com/SontecSamples/


Igor

Sontec x 8 Build Thread
« Reply #1 on: June 18, 2008, 03:40:45 PM »
Great, thanx!
http://www.ij-audio.com
(new site hopefully will be up in July)

JW

Sontec x 8 Build Thread
« Reply #2 on: July 15, 2008, 04:54:28 PM »
Hey guys.

I've searched forever for the Igor 8 channel build thread, and it appears this is it!

Anyway, if there is a future for this thread maybe someone could answer a couple questions for me.

As I have almost an entire kit on the way to me, I'll be starting soon on this project, but would like to know what kind of power transformer I should get.

I have an extra Mnats 1176 p.s. board and would like to use that. I'm assuming a 24-0-24 transformer would be good, but what amp rating should I be looking at?

Also, is there a schematic for Igor's version anywhere?

Thanks.

JW

Sontec x 8 Build Thread
« Reply #3 on: July 17, 2008, 06:51:50 PM »
Bump.

Anybody want to point me in the right direction?

JW

Sontec x 8 Build Thread
« Reply #4 on: July 18, 2008, 09:28:05 PM »
Thanks Pat! Are you saying this is the original transformer Sontec used (I'm guessing not) or the one that Igor used in the 8 channel unit? Just curious. That's probably not the one I'll end up with in any regard.

Brad McGowan

Sontec x 8 Build Thread
« Reply #5 on: July 25, 2008, 09:21:22 PM »
I'm hoping Igor or someone else can shed more light on why there are six pads for the bypass switch connection.  What's supposed to go where?  I buy 1 and 3 get connected for operation, but what about all those other connections?

thanks,
Brad

drpat

Sontec x 8 Build Thread
« Reply #6 on: July 25, 2008, 11:17:59 PM »
JW,

Yes, that's the original transformer that Sontec used...
I use the LA2a on very hot signals like lead vocal.

Brad McGowan

Sontec x 8 Build Thread
« Reply #7 on: July 30, 2008, 05:57:45 PM »
Are any of you guys using XLR's for your Sontecs?  I'm not at home and don't have access to the BOM right now...I'm wondering if someone can tell me what XLR fits on the board and whether or not they line up with the rear holes (I'm pretty sure they do).

thanks,
Brad

analogical

Knobs
« Reply #8 on: October 05, 2008, 03:36:33 PM »
Any Part numbers for knobs would be much appriciated. Using Igor's pots.

Edit: found them on the other "sontec 8 build thread"  

Might want to merge these two.

SKJGProject

Re: Sontec x 8 Build Thread
« Reply #9 on: May 22, 2011, 11:23:32 AM »
is there another build thread? i'm stuck atm and need some help with my sontec8
I used to date a blind girl. Her name was ::… ..:.: .:::. .::.. ….: .:.::


SKJGProject

Re: Sontec x 8 Build Thread
« Reply #10 on: May 22, 2011, 12:38:58 PM »
i bought pcb, case and lots of parts from some member here and now
i don't know where to put the following parts:

- 100 k2k (seems to be CAPACITORS SILVER MICA/POLY/COG
4   5p        C2.5/2          CF1.2, CF2.2, CF3.2, CF4.1 because i have 32 pieces but 100 is the wrong value???)

-the 220µf elkos are rated 25v, should i get new ones or can i use them for C1 & C22

-the 3.9MOhm Resistors are 5% not 1% is it important or can i use the 5% ones

-i got 5.62k instead of 7k5 , how much boost/cut will i get when i use these for rf1b, rf1c etc.?

« Last Edit: May 26, 2011, 09:53:49 AM by SKJGProject »
I used to date a blind girl. Her name was ::… ..:.: .:::. .::.. ….: .:.::

SKJGProject

Re: Sontec x 8 Build Thread
« Reply #11 on: May 25, 2011, 12:04:38 PM »
which trafo is needed?
I used to date a blind girl. Her name was ::… ..:.: .:::. .::.. ….: .:.::

zayance

Re: Sontec x 8 Build Thread
« Reply #12 on: May 25, 2011, 12:47:25 PM »
which trafo is needed?

Depends on Opamps used, I used OPA604 and 2604 all the way at +/-24V, so a 2*25V, and 100VA iirc....
« Last Edit: May 25, 2011, 01:05:44 PM by zayance »

SKJGProject

Re: Sontec x 8 Build Thread
« Reply #13 on: May 26, 2011, 10:00:30 AM »
thx, any help for the other questions?

in my bag there were also the caps missing for CLF2 (4u7), CLMF2 (0.47) and C59(100)...which caps should i get? WIMA FKP3 for the filters?

which PS board should i get?
I used to date a blind girl. Her name was ::… ..:.: .:::. .::.. ….: .:.::

radiance

Re: Sontec x 8 Build Thread
« Reply #14 on: May 26, 2011, 01:37:54 PM »


which PS board should i get?

Any PSU with LM317  &  LM337  will do.
"Knowing that you are dreaming, however, does not automatically guarantee full rationality.
Then again, being awake doesn't ensure good thinking, either." -  Lynne Levitan

SKJGProject

Re: Sontec x 8 Build Thread
« Reply #15 on: June 01, 2011, 09:53:47 AM »
which trafo is needed?

Depends on Opamps used, I used OPA604 and 2604 all the way at +/-24V, so a 2*25V, and 100VA iirc....

i will use the same opamps and luckily i already have some 2x25v 340va toroid...i can use any rating above 100va, right?
I used to date a blind girl. Her name was ::… ..:.: .:::. .::.. ….: .:.::

zayance

Re: Sontec x 8 Build Thread
« Reply #16 on: June 01, 2011, 02:52:39 PM »
OVERKILL but why not? The thing must be FAT and HEAVY tough  ;D :)

SKJGProject

Re: Sontec x 8 Build Thread
« Reply #17 on: June 05, 2011, 02:32:43 PM »
i don't know where to put the following parts:

- 100 k2k (seems to be CAPACITORS SILVER MICA/POLY/COG
4   5p        C2.5/2          CF1.2, CF2.2, CF3.2, CF4.1 because i have 32 pieces but 100 is the wrong value???)

-the 220µf elkos are rated 25v, should i get new ones or can i use them for C1 & C22

-the 3.9MOhm Resistors are 5% not 1% is it important or can i use the 5% ones

-in my bag there were also the caps missing for CLF2 (4u7), CLMF2 (0.47) and C59(100)...which caps should i get? WIMA FKP3 for the filters?

-i got 5.62k instead of 7k5 , how much boost/cut will i get when i use these for rf1b, rf1c etc. which value gives +-12db?



*bump*

any help?
I used to date a blind girl. Her name was ::… ..:.: .:::. .::.. ….: .:.::

zayance

Re: Sontec x 8 Build Thread
« Reply #18 on: June 07, 2011, 05:08:28 AM »
Quote
100 k2k (seems to be CAPACITORS SILVER MICA/POLY/COG

Pictures? If your guess is right then maybe a 100nF (0.1uf) any cap tester in hand?

Quote
4   5p        C2.5/2          CF1.2, CF2.2, CF3.2, CF4.1 because i have 32 pieces but 100 is the wrong value???)

100 for 100nf and so 0.1uF i guess?, a cap tester could be nice, on visual check of the printed layout i see 14 x 0.1uF so that makes 112 needed in total (minus PSU), better check twice, but you could be short on that one if it's the case.....

Quote
the 220µf elkos are rated 25v, should i get new ones or can i use them for C1 & C22

C1 & C22 are Bypass PSU Caps (see Schemo) so Electrolytics, better be over 25V if you're using 2x24V, i'd go for 50V.

Quote
-the 3.9MOhm Resistors are 5% not 1% is it important or can i use the 5% ones

All is good....

Quote
-in my bag there were also the caps missing for CLF2 (4u7), CLMF2 (0.47) and C59(100)...which caps should i get? WIMA FKP3 for the filters?

Any good poly would do, Epcos, Wima etc.....

Quote
-i got 5.62k instead of 7k5 , how much boost/cut will i get when i use these for rf1b, rf1c etc. which value gives +-12db?

From the Sontec Thread Igor's response:

Quote
Hi, 4k7 will give exactly +/-12db.

Yes the Sontec Stereo Thread will help you also.

Hope this helps?
« Last Edit: June 07, 2011, 06:37:52 AM by zayance »

SKJGProject

Re: Sontec x 8 Build Thread
« Reply #19 on: June 07, 2011, 07:46:17 AM »
no cap tester :-(
but i still got the 100k2k
« Last Edit: June 09, 2011, 11:00:12 AM by SKJGProject »
I used to date a blind girl. Her name was ::… ..:.: .:::. .::.. ….: .:.::


 

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