ytsestef

"Unison Design" GSSL Finished! Pics inside
« on: September 10, 2009, 06:21:07 PM »
 :o :o FINISHED MY GSSL!!  :o :o

Here are some pics:  ;D ;D ;D










I used THAT2180AL08-U for VCAs, Sidechain and Turbo Board.
I did the following mods:

- Removed both 10k resistors from each VCA circuit (that is four resistors)
- Removed 68R resistor from each VCA circuit
- Removed 1M resistor from each VCA circuit
- Removed 47R resistor (pin4) from Sidechain
- Removed 47R resistor (pin4) from Turbo Board.
- Changed 3k9 resistor to 5k1 for each VCA circuit
- Changed the meter resistor from 2k to 4,7k (Behringer meter)
- Did the PSU mod which adds two 100nF/50V caps and a 1N4007 diode underneath the 79L12
- Changed 1000uF/63V caps to 2200uF/63V caps
- Switched 91k and 750k auto-release resistors in Control Board.

Sounds awesome. I want to thank everyone for making this a reality!

One of these days I'll try to post a video describing my powerup problem. I wonder why hasn't anyone answered yet.  ??? Is it that rare?

I also wonder if this will make it in the DIY gallery meta  :P

Anyway,
Cheers

Next project: SSL 9K!

Stefanos.

PS: On the last picture some potatoes can be seen under the table (the photos were taken in the kitchen). They sound very good, too  :P
Stefanos.


SSLtech

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #1 on: September 10, 2009, 06:53:24 PM »
I also wonder if this will make it in the DIY gallery meta  :P

Already done!!!

 ;D

-Nice work,

Keith
"A waist is a terrible thing to mind"
Quote from: PRR
Ah, but that was 1999; we don't party like that any more.

ytsestef

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #2 on: September 10, 2009, 07:02:17 PM »
Woohoo, thanks a lot Keith!
Stefanos.

regularjohn

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #3 on: September 10, 2009, 07:03:39 PM »
I like the hand-labeled front panel!  Reminds me of boutique guitar pedals.  Where'd you get the orange meter?  Very nice!
SATANOSCILLATEMYMETALLICSONATAS

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #4 on: September 10, 2009, 07:04:05 PM »
nice! hopefully I'll get to mine soon.. no idea on your power-up probs, did you search through the SSL thread? If you click "print" it brings up the whole thread on one page, making it pretty easy to do keyword searches.

okgb

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #5 on: September 10, 2009, 07:07:23 PM »

 the hand labeling looks good  , almost purposeful
GKB Audio / Greg Boboski

ytsestef

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #6 on: September 10, 2009, 07:18:45 PM »
Thanks! Of course I did search, but I only found a guy who had that same problem* but he seems to had some specific brand of 7xL12 regulators which the circuit -for whatever reason- doesn't like. But it appears this is not the case with mine. That's why I did the PSU mod and changed the big caps to 2200uF. It did got better (doesn't do it that often) but it persists.

* The problem:
One out of two times the the 12V rail (can't remember whether it is +,- or both) disappears upon startup. The power led doesn't work and the meter shows ~4 dB reduction. When I switch it off the meter needle slams its way to its resting position and the power led blinks. When I switch the unit on again, everything works flawlessly. After the modifications (psu and caps) it happens 1 out of 5 times. Much better, but I think I camouflaged it :-[


 the hand labeling looks good  , almost purposeful


thanks a lot, it actually is purposeful!
when I make something I want to keep the costs down (when it comes to looks only), and I want it to look like DIY (but not ugly) because that's what it is!
Stefanos.

noulou

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #7 on: September 11, 2009, 04:37:17 AM »
poly wraia douleia stefane, sygxaritiria!

 ;D ;D

Henrik P

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #8 on: September 11, 2009, 04:52:43 AM »
Nice!!!   :)

ytsestef

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #9 on: September 11, 2009, 05:22:41 AM »
poly wraia douleia stefane, sygxaritiria!

 ;D ;D

ox! kiallos ellinas! euxaristo poli!

Nice!!!   :)

thanks a lot  :)
Stefanos.


V9977

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #10 on: September 11, 2009, 07:19:08 AM »
Katapliktiki doulia! Bravo Stefane! Wraios metasximatistis.  ;)
CAUTION:  Equipment is alive

ytsestef

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #11 on: September 11, 2009, 07:32:50 AM »
Tha anoikso thread "how many greek are here anyway??!?" sto telos mou fainetai!
Euxaristo poli fileV9977.  ;)

That trafo is very cool indeed, and a piece of cake to wire and mount!

I like the hand-labeled front panel!  Reminds me of boutique guitar pedals.  Where'd you get the orange meter?  Very nice!

I got the behringer meter from diypartssupply.com with a white led, took it out and soldered a 12V orange one in its place with such specs so that it would double as a power led.
« Last Edit: September 11, 2009, 07:36:30 AM by ytsestef »
Stefanos.

ChrioN

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #12 on: September 11, 2009, 07:50:53 AM »
Sick look! Where did you get the case? Looks really sturdy.
"All PCB traces are curved to emulate the electrical response of point-to-point wiring" -Drip

okgb

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #13 on: September 11, 2009, 07:54:52 AM »
what i meant was , looks like a font
created for a casual look  , not snobby or too overly serious
i couldn't print that nice myself , hope it serves you well
GKB Audio / Greg Boboski

Kingston

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #14 on: September 11, 2009, 08:01:34 AM »
What does that "aarhus" mode do?

ytsestef

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #15 on: September 11, 2009, 08:10:47 AM »
Sick look! Where did you get the case? Looks really sturdy.
I got the case from a local store in greece, it is cheap as hell (about 20 euros) and it falls far away from sturdy.
It is the wobbliest aluminium I have ever dealt with. At least it looks good and it's easy to drill. ::)

what i meant was , looks like a font
created for a casual look  , not snobby or too overly serious
i couldn't print that nice myself , hope it serves you well

I used a very fine tip and I took it slowly, took me 10 minutes to write so little stuff. With patience anything is possible I guess  :D

What does that "aarhus" mode do?

It merely disables the turbo board and acts like Jakob's original design. I just used expat audio's terminology ( "Aarhus / Oxford" instead of "Turbo off / Turbo on"). Sounds more funky that way  :)
Stefanos.

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #16 on: September 11, 2009, 08:18:50 AM »
good-looking stuff, enjoy!!  :)


(pantou uparxoun koinezoi kai ellhnes  ;D)

SSLtech

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #17 on: September 11, 2009, 08:50:59 AM »
Hey, take a listen to the noise level on silence, and let me know if you hear some low-level 100Hz hum.

If you do, let me know... I've just finished another "bolt-on" board to solve the issue, and I'm looking for a guinea-pig to test it.

Installation takes TWO minutes or less, by the way.

Let me know if you're interested.

Keith
"A waist is a terrible thing to mind"
Quote from: PRR
Ah, but that was 1999; we don't party like that any more.

ytsestef

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #18 on: September 11, 2009, 09:26:38 AM »
Nice one, Keith! I think my GSSL fortunately doesn't qualify as a guinea-pig.
I put it through Elemental Audio's IXL plugin and found the following (see attachment)

The gain makeup is turned all the way clockwise, and still about -78 noise floor (it is not scientifically tested, with dummy loads etc) and the frequency response of the noise seems to be 60Hz mains hum with its harmonics and some hiss rather than 100Hz. It can't be heard unless I crank up the volume where the music is VERY LOUD, so I guess it is insignificant / normal  :-\

Correct me if I'm wrong.
What causes the 100Hz hum anyway?
Stefanos.

Re: "Unison Design" GSSL Finished! Pics inside
« Reply #19 on: September 11, 2009, 09:36:16 AM »


great build!

re your mains hum, you might want to try

1. twisting your AC cabling, in and out of you mains tx

2. use off board Recitifier and smooting caps...there is a drawing some where..this really works...mine was silent after this.

3. also turn your torroid for least amount of hum....ive never got any futher milage with this but worth a try.

cheers
Pete


 

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