sontec 1 RU build thread

[zayance]

yes

 

[ptron]

the other 10 pots i defo got to order to alphastat then i guess? .. they havent replied yet

 

[Leonardo_007]

Hi,
currently i face a problem with the sum amp...
i'm stuck because i don't know how to deal with the area around the OPA604 (+24, GND,-24, +in, -in, out).
on the photos i've seen of the old version, there is a further stage set up  on this area which has not been part of the red pcb set.
can you help?
thanks in advance.
best
Leo

 

[Leonardo_007]

AAAAAH ok.... i think i understood...

these pins seem to be provided for those people who use other op amps than OPA604!?

alright.... and the mounted stage above on the "older" version is a discrete (maybe J99) type of op amp... alright alright...

so in other words - to conclude - i wouldn't have to do anything on these slots when using the OPA 604, right?

 

[cstella]

Yes that is correct. You can also omit C59 150p as per the BOM.

 

[Leonardo_007]

alright,thanks!

another question on the intern capacitor (hard left side on the sum amp, indicated with 1mF value):

i saw that several dudes used a wima polyester capacitor, mks4...
normally, they are not available with 1mF... i ordered an electrolythic cap instead...
is it really 1mF value this CIN???

concerning grounding, i'd only need to establisch ONE star-ground point on the chassis, right? this is where i need to connect 4 points: the ps, the transformer and the two sum amps, right?

 

[cstella]

Sure they are. Look for 1uF

http://www.mouser.com/ProductDetail/WIMA/MKS4D041002F00KSSD/?qs=sGAEpiMZZMvOcEq4GH1AAlUs2Fayh3j%2fqBV5lAHCsAo%3d

Regarding the star ground and sources you are correct.

 

[Leonardo_007]

ok and this is what i do not understand, because due to the pcb, the cap indicated as CIN does show a value of 1 mF and not 1 uF.

so is it in fact 1uF instead of 1mF? i didn't get that out of the thread...

thanks in advance, cstella.

bw,
Leo

 

[cstella]

Yeah it's confusing the way it is listed since the other 1's all say 1U.

1uF is 1 microfarad hence 1mF.

Thanks, Charles

 

[Leonardo_007]

oh ok!

thanks for having shared this information, it may be a helpful one for the pcb creator as well in order solve this issue with version 1.7, thanks Charles.
i may get back to you when it comes to transformer connection...
the rest should be manageable, assuming i did a reasonable job on the soldering...
best wishes from germany,
Leo

 

[druu]

Igor still about? Ordered a set of boards from his site and haven't had a response yet?

 

[RATMNL]

I think I read somewhere he's bound to get back from holidays any day now...

 

[Leonardo_007]

yeah, Igor is currently on vacation...

my unit works now! it's just wow!

i own now a mastering eq which are being sold for several thousand dollars!

awesome job has been done on the pcbs!

to be honest... i waited some time for them to come... but the payoff has been extremely satisfying!

 

[Aleguitarpro]

Hi!
I've finished to find all the components for my Sontec.
I've found this power transformer, that suites the specs of the real sontec POWER DETAILS:

http://www.musikding.de/product_info.php/info/p2884_Toroidal-transformer-230V----2x-24V-10W.html

In the Sontec specs I've found:

Power - 240 VAC    21VA
Fuse  -  0.15 Amp@240V

Could I use that toroidal (0,21 A for each secondary) or it's too less powerful??

I'll use OPA2604-OPA604-OP275.

The only option that I've, is to find another toroidal in MOUSER site...but which??

Thanks!

p.s. I'm from italy and here it's very difficult to find something useful to this kind of project...

 

[cstella]

That may be a hair on the small side. Add up all the current requirements of your IC's and see.

I used this one in my build and it works great. It's a bit more powerful.

http://hairballaudio.com/shop/product_info.php?cPath=33&products_id=37

Thanks, Charles

 

[Aleguitarpro]

Thanks, I've used that transformer in my 1176 clone.
I'm trying to find something here in Europe (that transformer 25$+ shipment+customs taxes+21%taxes cost me a lot...)

Anyone has bought a similar toroid here in europe??
I prefer to find one suitable to this application in mouser...any code suggestion??

 

[cstella]

I did not have much luck at Mouser when I was looking. I know some people used these from Farnell. Not sure if their Italian branch works fro you or not.

http://it.farnell.com/multicomp/mcfe030-25/trasformatore-30-va-2-x-25-v/dp/9531750?Ntt=MCFE030/25

http://it.farnell.com/multicomp/mcfe050-25/trasformatore-50-va-2-x-25-v/dp/9531807?Ntt=MCFE050/25

 

[Aleguitarpro]

After 1 day of research, I've found this one (25VA):

http://it.mouser.com/Search/ProductDetail.aspx?R=VPT48-520virtualkey55310000virtualkey553-VPT48-520

and this one (50VA):

http://it.mouser.com/Search/ProductDetail.aspx?R=VPT48-1040virtualkey55310000virtualkey553-VPT48-1040

It's not very clear the searching options in mouser... :S

Thanks for help!

 

[cstella]

cool!

 

[ptron]

sorry to bother yall! i just checkin here wanted to see if these are good for our cause. im gettin the case from tat

(MALE)
http://mx.mouser.com/ProductDetail/Neutrik/NC3MD-H-BAG/?qs=sGAEpiMZZMv0W4pxf2HiV0%252bKdhvD8lQR7TrIC38bFrM%3d
or
http://mx.mouser.com/ProductDetail/Neutrik/NC3MD-V-BAG/?qs=sGAEpiMZZMv0W4pxf2HiV0%252bKdhvD8lQRZfW6%252bHEjzvA%3d

and (FEM)
http://mx.mouser.com/ProductDetail/Neutrik/NC3FD-H-BAG/?qs=sGAEpiMZZMv0W4pxf2HiV0%252bKdhvD8lQRVxgm65Gvs8w%3d

-- i can see from the drawing of these neutriks they are horizontal i thought the pins had to go down vertically to mount to pcb?

do i need metal standoffs so to get grounded from pcb?

will the pcbs hold themselves from the pots and I/O XLR`s respectively without standoffs in case previous question is no? (except power supply)

just checking what else i need to get!!

thanks a lot for your help