GSSL HELP THREAD!!!

[bassculture]

to janczmok :

you'll probably get less humming by using the corner connectors.

lot of users experienced a -60 or something hum due to having the power regulation on the same board as the rest of the GSSL.

this topic has been covered 1000 times...
it's not really an issue for a 1st build (you can solve that later when your comp will be working right).
because there isn't 1 solution for all (depend on grounding blablabla), and it's better to try de-bugging the hum when everything is in place.

 

[SIXTYNINER]

hello , someone have compatibility info for this THAT ics with gssl?

THAT2180AL08-U
link
http://uk.farnell.com/that-corporation/that2180al08-u/amp-volt-controlled-pretrim-2180/dp/1354166

THAT2180BL08-U
link
http://uk.farnell.com/that-corporation/that2180bl08-u/amp-volt-controlled-pretrim-2180/dp/1354167

THAT2180CL08-U
link
http://uk.farnell.com/that-corporation/that2180cl08-u/amp-volt-controlled-pretrim-2180/dp/1354168

thanks in advance to any post info
6T9R

 

[geetar_king]

hello , someone have compatibility info for this THAT ics with gssl?

I think they are all good, take your pick. I'd go with the A or B

 

[trancedental]

Looks like THAT has changed the pins on the 2180's?

The Profusion ones look different? http://www.profusionplc.com/pro/gex/manuftable?imanuf=THAT&itypes=Voltage%20Controlled%20Amplifier#

Do those farnell types get soldered straight to the PCB or can you use sockets also?

 

[geetar_king]

They seem identical to the THAT listed at mouser, etc. The picture might not even be the right one there. They probably just used a generic SIP-8 part for the image.  The data sheet at that farnell site links to the THAT data sheet of the THAT Corp website, and the part numbers are the exactly the same as on the THAT website.

Farnell says its in the SIP package, so yes you should be okay to use the sockets as well. Pin order is the same.

Never ordered from them though, but it all seems to match up.  The A, B and C are the same, just total harmonic distortion varies 0.01%, 0.02% and 0.05% respectively.

 

[feza]

Yo,

Placing the last bit of an order. My question is based around heat shrinking the GSSL cable terminals and such. I've found this type :

http://nl.mouser.com/Search/ProductDetail.aspx?qs=fltJrqpyVmVcKjGgQRdy4w%3d%3d Heat Shrinkable Tubing FP-301 1/16X100 BLK 100' SPOOL

Is this the correct product in the range? There is some kind of ratio system I do not really understand. This particular product has 2:1 ratio. Is it something about stock thickness?

Remember what is told to me is being noted and will by uploaded with thorough info about my build. My build will be fully featured with the SSC, Turbo, and relay bypass. My next question will be based on a drawing which is the wiring of the GSSL. Hopefully it pays off  after reading the complete thread and other threads!  ;D 

Thanks for the answer people!

 

[mitsos]

That's a lot of heatshrink.  About 30 meters. I would try to buy some locally, cuz chances are, you won't use all that for a looooong time.

The 2:1 is the ratio it shrinks when heated. In other words, when you apply heat, it shrinks to half its "before-heat" size. It is 1/16 inches (about 1.58mm) cold, so after it is heated it will be 1/32 inches (.79mm).

 

[feza]

Haha! 30 meters!

Thanks for the reply but overlooked the lenght, 2 meters will do. 

 

[onlymeeee]

Hi, I am struggling with the correct wiring for my iluminated 3 pole switch. (3PDT)

There are 2 "contacts" on the bottom (marked -a and b+) which I assume is for the LED inside.

There are 4 "contacts" on each pole (labelled 21, 22, 13, 14). This is what I am confused about. I was expecting only 3 contacts, one for com and then an off and on. 

Could anyone share any info? Sorry if it's a stupid question.


http://www.farnell.com/datasheets/73692.pdf    Thats the datasheet there.

 

[geetar_king]

Not familiar with that switch. What I would do is take a multimeter to it and check continuity when switching in and out. You should be able to see which poles connect and disconnect when switching in and out.

 

[bassculture]

anyone on that CRUSH thing ?  :-\

> original post :
question to the SSL specialists :

yesterday i welcome a sound engeneer at a venue.
he has a GSSL he bought a few day ago from a german guy.

he has the sidechain w/ THR**ST on it, but didn't know what it was for.
so i showed him - he was very pleased.

but he also has a knob with a "crush" label, with 6 position (off - C1 - C2.... C5)
we didn't have time to open the compressor and look what's inside.
but the result seemed to be more and more compression from C1 to C5 position


i've almost finished two working GSSL with sidechain & turbo.

i haven't managed to find any usefull info on this "crush" mod...

 

[geetar_king]

The Alan Smart C2 which is very close to the SSL design has the Crush button. I haven't heard of it on a gssl.

The following is taken from a Smart C2 review at primalgear.com

Crush mode drives the C2 into not-so-subtle FET distortion. When engaged, the C2's output level jumps up nearly 3 dB and upper harmonics are accentuated. It appears the compressor also adds a dose of equalization in this mode, which serves to carve out the mid- and low-mid frequencies a few dB. The amount of distortion added appears to be fixed and is unrelated to input level, output level or the amount of gain reduction applied. Hence you could use the C2 to add some distortion (but no compression) by taking the threshold all the way up and engaging both compression and crush modes. ...

...I really liked the sound of the C2 on the bass as well, and was surprised to find the crush button useful yet again. Crush mode added extra growl and definition to the sound, which was perfect for some songs.

Crush mode sounds a bit like a distortion-based exciter. The effect is pronounced but usable, especially with edgier music styles. Crush tends to push an instrument forward in the mix and accomplishes much of the opening up usually done with EQ. Even lead and background vocals cut through better with the crush engaged. Breathy vocals picked up some extra wisp with crush engaged.

And from the Smart Research website...

The characteristic sound of this unit arises mostly from the fast response at the onset of compression, which when delayed to occur around the mid range attack settings (after 0.3 to 3 milliseconds) results in a window through which transients can still pass. When used accross a mix, or with any dynamic programme, this has the effect of adding 'punch', as the sidechain 'breathes' around these transients, while still controlling overall levels. CRUSH mode has been developed as an extension of this 'musicality', adding to and accentuating the factors involved in producing the character of the unit. CRUSH may sound surprising to those interested in more gentle applications, being capable of exaggerated compression effects, but in conjunction with the fast limit settings also introduced with this unit, it allows the C2 to be used for a much wider range of applications than the C1.

Sounds like the one you saw might have had something similar to this, with a "variable" crush knob.  I'm not familiar with how this works.

Anyone else?  Anyone got a C2 to open up?

 

[gyraf]

Chrush is supposedly an implementation of the SSL talkback (simple opamp+FET) amplifier ALC.

Jakob E.

 

[bassculture]

ok.

thanks !

i definitly have to ask this engeneer to send me a foto of the inside of the comp.
will post here if i got them.

will have look to the SSL talkback schemo.

by the way Jakob : 

would you help us finding where to plug a little crossfade circuit (not symetric) inside the GSSL ?
see here :  Drawing Board > "Crush-n-Blend"
http://www.groupdiy.com/index.php?topic=8360.msg370763#msg370763
would be nice...

 

[onlymeeee]

Hi,

Just plugged in my gssl for the first time and the bridge rectifier blew with smoke. I've also built another which I've yet to plug up.  with a continuity checker the -12v point is connected to the ground. Is this correct?

 

[gyraf]

the -12v point is connected to the ground. Is this correct?

No. Think about it...

 

[feza]

Nevermind.....

 

[onlymeeee]

the -12v point is connected to the ground. Is this correct?

No. Think about it...

Assumed that yes. So I fix the short...

When the regs are mounted on the pcb, they don't short. When mounted on aluminium strip with a screw, connected to PCB by wires they short.  When I remove the wires from the board and test the reg in place on aluminium strip, they don't short. When the reg is removed, (wires still attatched to board, the wires do not short. Wires are going to correct holes.

Very confused. Any ideas what this is?

 

[SIXTYNINER]

UPDATES ?
Kyoritsu vu meters no longer available?
what other low cost vu meter/ppm chance possible (also for 2 unit rack mount)?
----
about signal in-out connector if Molex 5 pin:
Better this model : digikey code WM4303-ND
(no space on pcb for other model)
but the type of in-out pcb signal contacts pin digikey code : WM1114-ND
really not nice ......
a gold or silver plated pin contact , will be most adapted for "professional" audio signals.
have a nice diy day
6T9R

 

[gyraf]

When the regs are mounted on the pcb, they don't short. When mounted on aluminium strip with a screw, connected to PCB by wires they short.  When I remove the wires from the board and test the reg in place on aluminium strip, they don't short. When the reg is removed, (wires still attatched to board, the wires do not short. Wires are going to correct holes.

Very confused. Any ideas what this is?

Check the data sheets for the regulators, or read the text at the Gyraf page: The heat sink tabs on the regulators are (like nearly always) connected to the centre pin - and must thus never touch.

So you need either isolation-mount kits, or you need to mount the regulators without cooling (like most of us do). Are you sure that you really need the extra heatsink?

Jakob E.