GSSL HELP THREAD!!!

[gyraf]

...probably better to use a resistor in series, and go with the original 12V..

Jakob E.

 

[darkcharly]

...probably better to use a resistor in series, and go with the original 12V..

Jakob E.

Thank you! I'll do that.
Greetings.

 

[grrrunge]

I recently scored a bunch of free toroid assemblys (toroid trafo with mounting bracket and IEC socket with power switch and fuse socket). They're all 230V in and 28V-0V-28V 2.3A out.
A LM7815/LM7915 combo Will handle up to +/- 35V. Though it's probably overkill, could i (safely) use one of these toroids to power two GSSL's in one 2U case?

 

[Harpo]

I recently scored a bunch of free toroid assemblys (toroid trafo with mounting bracket and IEC socket with power switch and fuse socket). They're all 230V in and 28V-0V-28V 2.3A out.
A LM7815/LM7915 combo Will handle up to +/- 35V. Though it's probably overkill, could i (safely) use one of these toroids to power two GSSL's in one 2U case?

No. AC voltage isn't = DC voltage. See http://groupdiy.com/index.php?topic=47.msg714443#msg714443

 

[grrrunge]

So i should read the 28-0-28 as an output of 2 * 28V * sqrt(2) = 79.2V(peak-peak) ?

 

[Harpo]

At least. Could be a lot higher. 35V caps rating wouldn't be sufficient as well when using different type/circuit of voltage regulators that could take this input voltage and the regulators I/O voltage differential times load current will generate lots of heat. Better use your transformers for a different project or as a doorstop instead.

 

[gyraf]

...28-0-28 would make a good power source for a 1176...

Jakob E.

 

[grrrunge]

...28-0-28 would make a good power source for a 1176...

Jakob E.

Awesome! Like the Phat Phet pcb from PCBgrinder? I've got one of those on my to-do list during the summer holidays...

 

[Che_Guitarra]

Hi guys.  I'm in the process of drilling the faceplate for my PCB Grinder GSSL project, and want to keep it all as aesthetically pleasing as possible.  It's going to have a turbo and sidechain, with the turbo constantly on (& no need for a switch).

Anyway, space is tight, i've already fitted the meter and on/off switch, and i'm hoping to use a rocker switch for the bypass.  Unfortunately it's late, i'm having a brain fade looking at the schematic, and i'm not good with the acronyms used for switch naming  :-[  Am I chasing a DPDT or 3PDT switch for bypass... or something esle?

I've tried searching through the thread, but at 320 pages long it's a behemoth to get through  :-X

 

[Harpo]

..use a rocker switch for the bypass.
Am I chasing a DPDT or 3PDT switch for bypass...

DPDT (without illuminated status display). Using relais for more needed switch poles will be easier and cheaper to source than a >2pole rocker switch. YMMV.

 

[Greg S.]

hi Guys,

I finished my New GSSL and imm. after powering up, the outer 10Ohm burned, I changed it and again...

I got no shorts there and any part is soldered correct.

Can some one tell me how much Watt both have to have?
1 got Metall 1%, 0.6W, 2x15VA Torroid

thx

 

[Greg S.]

Solved it, got a Shorty,  :

Working right now.

Question;

I want to build a Turbo into for getting better Stereo-Compression..

Do I also have to add a second Sidechainboard to compress in Stereo?

at the SC Board, Left and Right are joint together right after the In!!!

 

[gyraf]

I want to build a Turbo into for getting better Stereo-Compression..

I would recommend getting to know the unit as it is, and then later decide if you really need changes. "Better" stereo compression does not make sense - it's all a matter of taste and real-life use.

I know that all the add-ons are easy to consider must-haves - but the basic unit actually goes a long way.

Jakob E.

 

[ptron]

hello!! been a while! i hope all is well
just placing the parts on rev 11 is there any documentation for this revision? i got the rev 9 documents and they are quite outdated!! been trying to find for a while but not much luck!!
thanks a lot !

EDIT: Found em   https://pcbgrinder.com/index.php?route=product/product&path=59_69&product_id=51

 

[ptron]

hello! other thing i have in mind..
are the 10 and 22 ohm safe under 1/4w or should i go for 1/2?
in this design does the CRC becomes obsolete then?!

and on a separate note..
i am using serpent audio`s VCA`s for this builds. should i adapt them same as i did with igor`s?
with igor`s VCA`s, i had 2.5k instead of 15k just under the "output" letters on the board also 220pf instead of the 100pf there.
i also used 182k instead of the 1M (% on new board) and a jumper wire instead of the 27k* between regulators and vca`s
i wonder if this is ok with the new VCA boards or i got to do something different?

all the best!

 

[Harpo]

i am using serpent audio`s VCA`s for this builds. should i adapt them same as i did with igor`s?
with igor`s VCA`s, i had 2.5k instead of 15k just under the "output" letters on the board also 220pf instead of the 100pf there.
i also used 182k instead of the 1M (% on new board) and a jumper wire instead of the 27k* between regulators and vca`s
i wonder if this is ok with the new VCA boards or i got to do something different?

2K5 feedback resistor is correct if 4 VCAs are fitted per module. I'd increase the 220pF across this feedback resistors to 330pF. Jumper instead of the 27K voltage to current converters (these 4*20K in paralleled VCAs are on the module) is correct as well. The 182K (probably 180K for 4*2181As, 56K for 4*2181Bs or 33K for 4*2181Cs) instead of 1M depends on type of THAT2181 used on VCA modules.

 

[ptron]

legend!! thanks a lot harpo!!

 

[djfatum]

I have a problem with ssl when joining is quiet and starts blinking LED when the switch does not work release and compression

https://www.dropbox.com/sh/qlis66dz7ggg0li/AAAkxMLH0gc-rCbPQF7pqX0ta

https://www.dropbox.com/s/oah0xbkry30gry2/IMG_2143.MOV

 

[djfatum]

TL 072

pin 8  12v
pin 4 2v
pin 7 9v

help

 

[Majestic12]

Looks like some problems with the voltage regulators, maybe also a latchup problem with the 7815 regulator.

Which kind of brand do you use for your 7815? TS branded regulators don't seem to work properly, I have switched to Fairchild to solve the problem.