GSSL HELP THREAD!!!

[gyraf]

As always: Get the unit working WITHOUT the mods, addons, bells and whistles.

Once the basic unit is known-good (which is the aim of this thread), you can go onwards and add functionality a little at a time - that way you will know where the problem is.

Jakob E.

 

[offthewallstudio]

As always: Get the unit working WITHOUT the mods, addons, bells and whistles.

Once the basic unit is known-good (which is the aim of this thread), you can go onwards and add functionality a little at a time - that way you will know where the problem is.

Jakob E.

thank you! how exactly can I do that? just snip the wires going from board to board?

 

[jhlamm]

Hi!

I am currently building the Gyraf compressor clone and I have read the instructions and tried to find answer here but no luck so far.

So the question might be stupid but it is about the resistor values marked with % in the VCA and right next to it. I'm trying to use the 2180 and have gone through the schematic, but as an unexperienced builder, I would like check what are the correct values.

Thanks in advance,
- J

 

[Gustav]

Hi!

I am currently building the Gyraf compressor clone and I have read the instructions and tried to find answer here but no luck so far.

So the question might be stupid but it is about the resistor values marked with % in the VCA and right next to it. I'm trying to use the 2180 and have gone through the schematic, but as an unexperienced builder, I would like check what are the correct values.

Thanks in advance,
- J

leave spaces marked % unpopulated when using the 2180.

Gustav

 

[Schorschii14]

Hi guys I think I need your help please.

I built the Gssl with the SSC Board and everything seems working correctly, except off the meter.
when I turn the Bypass on, the meter jumps to 0 dB and the audio signal starts compression.
when I turn the Bypass off, it looks like that the meter is pulled to minus. and the audio signal passes correctly by.

Thanks a lot 

 

[Potato Cakes]

Does it work without the SSC board?

Thanks!

Paul

 

[Schorschii14]

yes, the meter is working without the Sidechainboard

 

[Potato Cakes]

Is it fully functioning as well (audio, ratio controls, etc)?

Thanks!

Paul

 

[Schorschii14]

yes everything is working, threshold, ratio, attack, release, and also gain, i think the problem is at the sidechainboard, but i don't really know where it is.

 

[Gustav]

yes everything is working, threshold, ratio, attack, release, and also gain, i think the problem is at the sidechainboard, but i don't really know where it is.

If it work prior to installing the Sidechain board - Just to make sure nothing "went wrong" in the meantime, try removing it again. If the meter works again, with the SC board removed, you have isolated the problem. Then you can trouble shoot that portion only.

Gustav

 

[Schorschii14]

Now I changed it again and the GSSL is working fine without the Sidechainboard. But if I connect the Sidechainboard, the audio signal becomes quiet, has a strong distortion and the meter also doesn´t work again.
Even if I switch to off, he does not work anymore. Seems like I have a problem in the Sidechain or wiring.  :-\.
I wired everything like in the documentation.
But what should i do with the HPF connector? I took the "old" Sidechain out and left it without any switch.
and the "IN" from the Board goes to a normal switch or should this go to the HPF?

Thanks,

Georg

 

[mingus77]

Hola!
I guess this question is already answered in the thread, but I can´t find it. Sorry if double posting!

What do I need for the power switch? DPDT ON-ON?
I´m in 230V land Norway it that matters..

I guess there is several opportunities, but what should I be aware of?

Hope this super forum has the answer for me

 

[Gustav]

But what should i do with the HPF connector?

The three point connection point on he boards should be jumped from side to side (piece of wire, terminal/leg from a component will do it), if you are not using it for a side chain high pass.

Gustav

 

[Potato Cakes]

Return the unit to stock configuration, and see if it works. Its really hard to trouble shoot with mods added like this, since we can't be sure if its "just" the set-up of the switching.

Gustav


Just did, everything on it is working now!

Now I guess I should find out how this bypass switch should be wired. Something tells me it has to do with the two unmarked pins on the diagram circled below. It seems to be controlling the makeup gain (which would make sense). Any idea where I should wire those up to?

http://imgur.com/KK8iui3.jpg


Great news - problem isolated to the alternative switching.

The switching has been covered numerous times in this thread - sorry, I dont have direct experience setting it up.

Gustav


Alright I figured out a solution, with a compromise however. The desired operation of the switch is the light, compression, and makeup gain off when normal, and on when switched, however it's a DPDT switch so only two of those things can happen. Since I would rather vie for correct non-aestetic operation, I opted for the makeup gain and compression to be controlled with the switch, resulting in a diagram like this

--> http://imgur.com/scjMxAP.jpg <--

Note the NC and NO are flipped because I want the compression enabled when switched. The compromise being the light will stay on all the time, but I'd take that for a properly working unit. If you want the light to switch on and off, just wire it normally and bridge two wires (if you look on the schematic you'll see they are the two pads connected to the makeup gain pot output). Another problem I had when wiring up was the compression didn't work at first, which confused me. I then tried to do a continuity test on the switch and found out NO wasn't working on one of the poles. Since the makeup gain didn't need a NO state, I just flipped the wiring and everything worked fine. Hope this helped some people looking for answers.

You can use a relay to do everything you are wanting.

https://groupdiy.com/index.php?topic=47.3720

Thanks!

Paul

 

[Potato Cakes]

Hello, everyone!

I just finished a GSSL build and did several add ons and got everything working and everything is great. Right before I was about to button it up, I noticed that when the 10:1 ratio is selected, it shows about 3-5dB of compression. There is about -0.08VDC on the negative terminal of the meter. I'm mostly fine with it as if I do use the this ratio, I'm going to be more concerned about how it sounds and not about accurate metering, but for the sake of making everything perfect, I will remove the ratio board ONE more time and see if I see anything obvious. In the meantime, if anyone has come across this issue and was able to sort it out, I would appreciate any insights you may have.

Thanks!

Paul

 

[Potato Cakes]

So, once again, it was something silly. Apparently the line from the 10:1 point to the Turbo board was not making a solid connection in the Molex connector.


As you were...


Thanks!

Paul

 

[DrywOwens]

Searched thru and found one hit from 11 years ago that was somewhat similar but thought I'd ask-

if you want the short version of my question, skip to the bottom

I'm modding an existing GSSL with it's own PCB design that includes the turbo mod on it's main board. The person I'm modding it for wanted sidechain filtering  ability added on. I used more or less the same schematic as this one- http://sounddiy.free.fr/images/SSL/Doc/Sidechain/Sidechain_Sch.pdf

with the exception of leaving out a few of the filters. and I duplicated the circuit since this is a turbo GSSL. The compressor also already has external sidechain ability, so I wired it so that when you engage the external, the existing DPDT relay switches over to the new sidechain filter board.

when I connect the output of the filter board to the main board (at the 47k resistors prior to the VCAs), the unit goes into a strange behavior where the GR shown on the meter reads inversely proportional to the threshold pot setting.

TLDR since this is kind of an oddball in that I didn't build the compressor that I'm troubleshooting, I'd like to know if anyone can shed light on what conditions would have to be in order to make the GR inversely proportional to the threshold setting? Just looking for where to start looking, and I've never built a GSSL before. Sorry if this is a dumb question.

Thanks!

Having the same issue! Can anyone shed some light?

 

[gyraf]

..Maybe you/we should start a separate thread for the turbo add-on - it seems that problems related to that one is cluttering up this help thread (which is intended for the vanilla GSSL)..

Jakob E.

EDIT:

Here's the official GSSL Add-on help thread: https://groupdiy.com/index.php?topic=65232

 

[georgepalilis]

Hi could i ask some troubleshooting here on my SSL from PCB Grinders Kit? its nat workin properly
thanks

 

[Gustav]

Hi could i ask some troubleshooting here on my SSL from PCB Grinders Kit? its nat workin properly
thanks

Hi George.

Just write the question, and well see what we can do

First step is usually "check your voltages".

Gustav