GSSL HELP THREAD!!!

[pietro_moog]

cool.
superthanks!
so, insulating tape won't be enough to prevent this?

 

[pietro_moog]

i have isolated the VRs, and the comp was fine. then i reattached the Turbo board, resistors got burned.
i think i may have a problem in that board.
there are 5 diodes and 1 polarized capacitor.
i can't connect the board or i'll burn the 10R resistors before the 12V VRs.
what do i do?

 

[pietro_moog]

i looked at the turbo board. there are no errors, i could tell it for sure.
so i looked at the power rails and they were messed!
tomorrow i'll correct, replace the resistors and check again

 

[Harpo]

i looked at the turbo board. there are no errors, i could tell it for sure.
so i looked at the power rails and they were messed!
tomorrow i'll correct, replace the resistors and check again

You'll need a little luck that your Turbo VCA and TL074 have survived, being powered from reversed rail voltages.

 

[pearldrum944]

I just installed a turbo board into my gssl, and am getting some funny results.  I made it switchable

In Turbo mode with 1k tone:
Left channel: 8db compression
Right channel: 9db of compression
Both channels: 9db of compression

In GSSL mode with tone:
Left channel: 9db compression
Right channel: 9db of compression
Both channels: 8db of compression

Does this mean that my turbo board is "under" compressing?

 

[pietro_moog]

yay!!!  my Gssl is not exploding anymore!!!
cool. i exchanged -12V and Ground on the Turbo board. ok.

i tried it and it is distorting pretty much.
i don't know why. last time was working fine, than i changed VRs and i must have exchange wires on the Turbo board.
the distortion is not something in the sound, is something pretty big, is something like a big noise that makes my converters clip!
i checked a few voltages, not all of them, and they seems fine..

 

[Harpo]

yay!!!  my Gssl is not exploding anymore!!!
cool. i exchanged -12V and Ground on the Turbo board. ok.

i tried it and it is distorting pretty much.
i don't know why. last time was working fine, than i changed VRs and i must have exchange wires on the Turbo board.
the distortion is not something in the sound, is something pretty big, is something like a big noise that makes my converters clip!
i checked a few voltages, not all of them, and they seems fine..

The VCA on your Turbo board is most probably blown (exceeding THAT218x absolute maximum ratings of delta Ec +/-1V by 12V from your reversed wires).
For a prove you could swap the GSSL sidechain VCA with the Turbo VCA if you got these in sockets. If the distortion follows the swap, the VCA is blown for sure. If now both sides distort, the TL074 on your Turbo board is probably blown as well.

 

[radiance]

is distorting pretty much.
i don't know why. last time was working fine, than i changed VRs and i must have exchange wires on the Turbo board.
the distortion is not something in the sound, is something pretty big, is something like a big noise that makes my converters clip!
i checked a few voltages, not all of them, and they seems fine..

You'll need a little luck that your Turbo VCA and TL074 have survived, being powered from reversed rail voltages.

EDIT: Harpo types faster then I quote...

 

[pietro_moog]

oh no..
guys, my gssl is switchable. i tried Turbo ==> megadistortion and i tried Standard==> too.
i checked all the voltages on the comp and they are right.
is it possible that i have burned the TL074 and 2181 on the main board too?
will the 2180 between in & out be fine?
Will 5532s and 5534s be fine?

 

[jsefer]

Im getting ready to build. SEARCHED ALL OVER!! HAHA

simple question on the TOROID, most people use toroid #2 but toroid #1 is cheaper and almost same spec.

1. http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&WT.z_homepage_link=hp_go_button&KeyWords=VPT30-830+

2. http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=TE62063-ND

The only difference with these is in the ouput 832mA and 1.7A@15


is there a reall diference because one is cheaper than the other one, about half the price....

thanks!!!

 

[bpucekov]

I dont see any real diference in specs, I would buy cheper one
bpucekov
www.akaj.hr

 

[Phil]

hello everybody,

i'm a noobie to the DIY scene but i got my dad's help who studied electronics so i hope we'll manage to build the GSSL Comp.

My first simple question:
what is a crimp terminal? Maybe somebody is also german and can tell me the german word for it?
I can't order what i don't know ;-)

Thx in advance,

Phil

 

[Stagefright13]

A crimp terminal is what each wire end has on it. Used to insert into a multi connector block. Or you could solder the wires right to the board. But the connectors allow you to remove the board for trouble shooting. Sorry for not speaking Deutche. My Dad would slap me. LOL

John

 

[jeandoe]

(posted earlier but might have gotten lost among all the distortion questions, hehe)

Hey everybody

Alright. After loads of fault finding i had everything working nicely on the gssl. However the last two weeks I started experiencing distortion problems that seem to increase in quantity. It started with the ration switch, which caused gross distortion when switching between ratios. This would be solved by randomly adjsuting any of the knobs  Now the problem started appearing with practically all changes of position with any knob! What did seem to help was to turn knobs really really gently (???) 
The distortion seems to be a lot worse at the highest ration setting where it also introduces a strange tonal ca 4k crunchy noise.

Any ideas where i could start looking?

Much appreciated,

Joel

 

[Biasrocks]

The distortion seems to be a lot worse at the highest ration setting where it also introduces a strange tonal ca 4k crunchy noise.

Any ideas where i could start looking?

Look for shorts and bad solder joints on the control board.

Mark

 

[asle]

I have a problem. with my probe I have found that the sound ends right after the 27k resistor just before the VCA area. on the right side I get a CLICK with I touch the resistor(27k) leg on the secondary side. on the left side it is grossly distorted on the sec. side on that 27k. on the primary side on both resistors I have the sound like it should be.  HELP!  ???

 

[Harpo]

I have a problem. with my probe I have found that the sound ends right after the 27k resistor just before the VCA area.

You would have a problem if it is the other way round. These VCAs are current-in/current-out devices. The right side of these 27K resistors are at virtual ground. Nothing to listen to in this spot.

 

[asle]

I have a problem. with my probe I have found that the sound ends right after the 27k resistor just before the VCA area.

You would have a problem if it is the other way round. These VCAs are current-in/current-out devices. The right side of these 27K resistors are at virtual ground. Nothing to listen to in this spot.

but something to listen on on the other side of that 27k resistor.

so where is the next spot I am suppose to be able to "listen in" on the audio signal then ?

btw I am using a 2180 VCA but unsure if I should take out all the resistors in the VCA area that is described here - I have them all in now

http://diy.fischerworks.com/gssl_vca.shtml

 

[Harpo]

but something to listen on on the other side of that 27k resistor.

so where is the next spot I am suppose to be able to "listen in" on the audio signal then ?

pin7 of the VCAs following NE5532s. (the op-amp stages on the schematic differ from the pcb, 1st stage pins 5,6,7; 2nd stage pins 1,2,3).

btw I am using a 2180 VCA but unsure if I should take out all the resistors in the VCA area that is described here - I have them all in now

http://diy.fischerworks.com/gssl_vca.shtml

yes

 

[asle]

but something to listen on on the other side of that 27k resistor.

so where is the next spot I am suppose to be able to "listen in" on the audio signal then ?

pin7 of the VCAs following NE5532s. (the op-amp stages on the schematic differ from the pcb, 1st stage pins 5,6,7; 2nd stage pins 1,2,3).

btw I am using a 2180 VCA but unsure if I should take out all the resistors in the VCA area that is described here - I have them all in now

http://diy.fischerworks.com/gssl_vca.shtml

yes

DAMN - I think I minght know the reason why I dont have audio.  I think I forgot to bend or cut on of the 2180 legs off.     can that be it
?

it should be said that I have the trimmers in next to the VCA area