UPDATE: HERE YOU CAN FIND ALL DOCS:

http://twin-x.com/groupdiy/thumbnails.php?album=399

I probably go for DOA's in the IO board, what parts should i leave out?
There are some resistors that are on the side of the DOA square.

In case of DOA, solder these parts from bottom. Forssels have very short pins for example.
Other issue with PCB, that I used to solder DOA's direct to board, and
holes are smaller than  Harwyn pins from Farnell you probably going to use..
Possible to put them on opamp then solder over the pads, this way you can have opamps in socket.

I'm about to order caps and some other stuff, are there any particular type/brand caps that have proven to be the best sounding ones in the sontec?
Will WIMA's be a good choice for the poly's?

Yes, Wima's are just fine.

There came 2 PSU's boards with the kit, is it OK to use one PSU board for both channels?

Sure. If you building two separate units, use 2 power supply's.
Normally, one power supply going for one stereo set of PCB's unless
you mentioned two PS, IIRC there were 3 people who needed separate
power supplys...

probably post my questions better here instead of the order thread:

Busy sourcing parts here. Does anyone else have a problem getting the mica caps? Esp. 5 & 12 pF. Or are you just using poly's? (ceramics for the 5 & 12 pf)

I thought of getting 10pf + 2.2pf and use them in parallel (2.2 + 2.2 for the 5pf). couldn't find them either...

anyone lucky finding the 4pole 3.81mm molex in europe? What about RS# 173-3082, 245-4538, 173-3284  they are labelled as molex KK 3,96 - close enough in my opinion?

For the heatsink try farnell #1219493, a lot cheaper since igors recommendation is shipped from the us.

cheers!
christoph

You don't have to use Mica caps for the 5pf ones, try NPO/COG types
I am building the 8 sontecs in a rack version, and I used NPO/COG for those little values, at least try both and listen if there is sound difference, I bet no

[edit]
Schematic reference:
http://i251.photobucket.com/albums/gg291/diy33609/schem_upd.gif
With 2604 opamps, Igor suggested to leave CF1.2, CF2.2, CF3.2 eg connect nothing here. Those caps are here to avoid opamp oscillation but not needed with 2604 opamps. I did not use them on mine and it works fine
On the contrary, CF5.1 is mandatory, as there will be oscillation without it
(on my version it's labeled CF4.1, but you have one more band with your eq so you may be able to leave the CF4.1 cap on your version as well)

Just wondering about the purusha case and IO board, it looks like the XLR's are not going to fit on the board and then mounted to the rearpanel.
The holes in the panel are wider then where the connectors are supposted to be mounted on the board.

On Igors version it seems fine? Will check that as soon as I got home. I'll go for the 3,96 Molex at RS, will see if they fit, a little bit of (big) pin bending should do the trick...

Looks like PCB mounting the XLR's will not work with my case either. (also a Tat case).  No big deal, though.

OK, so it wasn't me
No big deal either, i'll just go with straigth solid copperwire (1.5mm) to connect the boards so they can 'hang' on the wire.

Hi, can you explain me what's the deal with Neutrics?
I have 2 of these eq's assembled and fully working,
everything fits 100%...Just see pictures!

Hi All,

I have tested mine, and while the specified XLRs (from the BOM) fit the I/O board, they don't fit the cutout length between the 2 XLR holes on Tat's case.  There is probably 5-10mm difference (I haven't measured it) Also, the cutouts for the XLR holes are to be too big.  The diameter of the plastic XLR sockets (that fit the I/O board) is slightly smaller to the standard metal neutriks (21? as opposed to 24?) Consequently the plastic neutriks "screw" terminals don't line up.  Even if you try to put just one XLR in, you cannot screw it at both mounting points.  They do mount the standard metal case XLRs perfectly.

My theory here (I'll wait for Tat's reply) is that somehow these are the "generic" 2 RU panels for other 2 RU projects, possibly forgetting about the special cutout diameters and the different length.

I'll post pics if it helps anyone.
Thanks
Ghengis

Ghengis and I must have the same back panels; if I mount the XLR's on the PCB they won't fit the case.

I just used some regular panel mount XLR's

Here's a question: BOM says: 1 150P C5/2.5 NOT NECESSARY WITH OPA604,

I'm using OPA604's, do I just leave out the 150P cap or should I solder a bridge?

Thanks!

Cheers,

G.

No need for bridge. Just leave them out.

Thanks for the Parts list... unit looks GREAT!!!  :thumb:  :green: