GSSL HELP THREAD!!!

[feza]

Hey,

I was wondering which D-shaft lorlin/alternative switches I need for the control board? I will be using Mouser or digikey. Reading about that subject but do not understand the logic which one I need to choose with D-shaft's.

Giving the GSSL a new try, must succeed.  

 

[Harpo]

I was wondering which D-shaft lorlin/alternative switches I need for the control board? I will be using Mouser or digikey. Reading about that subject but do not understand the logic which one I need to choose with D-shaft's.

Why do you want a D-shaft at all ? 
Have a look at http://www.lorlin.co.uk/pdf/CK.pdf to see possible options. (look up, if your wanted option is availiable at Mouser/Digikey/somewhere else, probably preferably in single, not thousands quantities).
If you, for whatever reason, are married with D-shaft knobs, just filing a standard round spindle 1mm down at the rotation angle needed to match you knob marking with your front panel and cutting it to length maybe is the easier/cheaper/more flexible way than getting a D-shaft spindle at whatever length and whatever flat angle offset in multiples of 15° needed to match your frontpanel.

 

[feza]

Thanks for your reply Harpo. 

 

[Pieter001]

Tried to get the hum away but it didn't happend. I don't know what im doing wrong.
My input xlr's are connected to the pcb and to the case. My output only to the pcb.
The pcb is grounded with the 3 standoff's. My IEC is grounded on the case.

If tried to disconnect the xlr grounds one for one. Connect the output xlr's to the case, i disconnected the iec ground and unhooked the SSC board but the hum didn't get away.
Is there any way to get rid of the hum?

I use a SSC board in my gssl.

Thanks for the help

 

[feza]

Hey,

Perhaps you can try the CRC option from Expat Audio or DIY-Parts Supply? I ordered the CRC kit from Ptownkid. It's an off-board power supply regulator, just a thought.     

 

[Pieter001]

Thats maybe a good idee. I already build a shield around my power toroid to get rid of the hum but it didn't work.
The thing i hear is a ground loop i think but i cant find where its coming from.

Thanks for the reply

 

[martthie_08]

Pieter, I would make sure not to have a ground connection via the pcb standoffs, use insulated ones. You will have mains ground going to the case (make sure there is a good connection, file away the paintjob), from there to pins 1 of the input xlr and from the input xlr to the main pcb. That should be a good starting point. Also make sure your XLR cables do not have pin 1 jumpered to the xlr metal enclosure! That said, I could never get my GSSL's totally hum free without a separate power supply pcb within the case, but you might want to try the extra filtering the CRC board supplies. Good luck!

 

[Pieter001]

@ martthie: I tried to disconnect the standoffs from the case to check if the hum get away but it didnt. The hum got worse.
You mentiont that you never get your gssl humfree. The hum i hear is realy quite but with some limiters on the master and not playing any music i hear it.
I also hear it when i turn the makeup gain all the way up. I dont hear it while im mixing. But i would like it if its totally humfree.

 

[Dazazone]

Hi I'm just finishing off a turbo 2 x ssc gssl.  I may need some clues with a couple of things as this is my first one of these. 
Firstly, I'm using That 2180A's all round and I haven't quite found a clear concluded answer about which resistors to take out of the sidechain, also the turbo board.  I've taken out 10k down the bottom corner of the main board and 47R just a couple above that. Same with the Turbo board, R19(10K) and R16(47R).  Is this correct?  I keep reading some people do it differently, rather confusing.

Another thing which I just want to make sure of is the 10 pin connector to the front panel board from the main board.  The Turbo board joins up to C, +12, -12 and 0.  May be a dumb question but just being sure of things - do you then disconnect these connections from the front board or just hang the turbo on them together?

Another dumb question - Is 'Aarhus Mode' pronounced 'Arse Mode'?  ???

What's a diode? 

 

[mac]

Hi there Dazzazone,

I built mine with 2180B,s

You would have seen Matt Fishers page on the web?? if not small excerpt attached...

 

[Dazazone]

Thanks Mac.
Yeah I have followed that info from Matt for the VCA's, it's just the sidechain VCA's I'm getting at here.  I'm pretty sure I'm doing the same thing as the VCA section by removing the 10K and 47R from the sidechain corner of the main board and also the Turbo board.  The pin 4 trim thing.....  I know it's the distortion trim pin and the 2180s are pre trimmed etc..
Just wanted to confirm before I inhale fried silicon.

Thanks 

 

[mac]

Hey Dazzazone,
Best advice i reckon is to get it working stock first, and then add the sidechain and turbo boards (pretty easy to remove the two 47k resistors etc once you know its all working stock first). I did my first one this way and it did save a lot of headaches trouble shooting.

I dont know about removal of the 10k and 47R resistors. Why do these get removed? Just for adjusting down the ratio to suit 2180? Arent these resistors tying pins 3 and 5 of the VCA to the -12v rail? My understanding is that the turbo board just adds a second sidechain VCA detector and connects via the front panel connector and at the 47k and 100R resistors on the main board adjacent to the TL072. (doesnt replace the connections but takes feeds from here). http://www.expataudio.com/diy/Turbo/TurboInstallationManual.pdf

Obviously if you are using two SSC filter boards, then you will already have the 47k resistors removed (as this is where the signal leaves and returns to the main board) for the filter boards.

Mac

 

[Dazazone]

Thanks Mac.
Nah I'm talking about the distortion trim on the sidechain That 2180's.  Just to do the same to the detector circuit as in matts thAT mod page.  Basically getting rid of distortion trimming on the sidechains.
It's cool I think I worked out that leaving the 10k and 47R out is the way to go.  I'll fire it up tomorrow and let you know if it's right.

Cheers

 

[Dazazone]

ok all good, I can pass signal and compress in a good way.  Everything is quiet humwise and the 2 ssc's are systems go! Woo!

Just one really silly mistake...
I ordered the Sifam AL19B meter.  I painted the needle white and put in the nice black 0-20 db compression scale.
When I compressed I reallised oh poop it's a mofo VU meter!
So I'm in the process of ordering the correct Sifam meter which is a 1mA FSD Sifam 19B Presentor DC meter.
So close yet so far.
argh

 

[mac]

bucks for them sifam meters eh!!!

I reckon I spent just as much on the knobs and the PPM14 as all the electronics in mine!

Mac

 

[electrisizer]

hi,
my clone is finished - BUT  :-\
i have problem with the voltage regulators 79 and 78 with 12V.

first they run very very hot!

...and the voltage is about 46V instead of 12V!

when i fit them first time and put the gssl on everything seems to be OK. now they seem to be blown.

question one: what could have blown the 12V regulators? (the 15V circuit runs like it should)
question two: may something be damaged - every VCA was fit at this moment.

 

[mac]

Once you get it up an running again, you could try a hat!

mine was getting a bit warm - so i fashioned an aluminium hat and a heatsink for it!

Mac

 

[Harpo]

...and the voltage is about 46V instead of 12V!
question one: what could have blown the 12V regulators? (the 15V circuit runs like it should)
question two: may something be damaged - every VCA was fit at this moment.

First guess is an empty battery in your multimeter.
What are your mains transformer secondary voltages. From your '46V' this would be a dual 30V or 60V center tapped transformer, exceeding the abs.max allowed 35VDC input voltages of your regulators. If this 46V reading unfortunatly was correct, expect all chips connected to the +/-12V rails (TL07x, sidechain VCA) to be blown.

 

[electrisizer]

First guess is an empty battery in your multimeter.

: yes it was the battery!!!

the hot voltage regulators were caused by my TL74 - i installed it the wrong way!
turning around fixed the problem

hope nothing is blown - thanks men!

 

[feza]

Hey,

My gathered info over the years, perhaps it finds some good use:

http://www.sendspace.com/file/0fdfot