GssL 20th Anniversary edition

[Andado]

And another rev3 board populated except 1 100nf and 4 bi caps for the output(banzai ship now pls!) this was quite therapeutic to do and now I’m hating resistors but I’m glad I’m dipping my toes into diy, already thinking of next build

 

[Gustav]

And another rev3 board populated except 1 100nf and 4 bi caps for the output(banzai ship now pls!) this was quite therapeutic to do and now I’m hating resistors but I’m glad I’m dipping my toes into diy, already thinking of next build

Great!

Remember to add some jumpers on the ground nodes.

They will probably just be connected on a later revision, but on early versions, it can be nice to have them isolated to work around any problems.

Gustav

 

[Andado]

Great!

Remember to add some jumpers on the ground nodes.

They will probably just be connected on a later revision, but on early versions, it can be nice to have them isolated to work around any problems.

Gustav

So all those are just ground? and then I should bridge the (PSU) labeled to? What kind of connectors do you suggest?

 

[Gustav]

So all those are just ground? and then I should bridge the (PSU) labeled to? What kind of connectors do you suggest?

Not sure what you are asking, so Ill just say this.

Grounds are

1. Relay grounds.
2. Audio (from XLRs - you can omit this, if you ground them to case direct from XLR - we will know down the line what works best)
3. 0 (general GND for opamp rails etc)
4. PSU the ground running through the pour in the PSU section
5. DRV - grounds on the buffer for VCA driver, which are a little sensitive in this design.

Theres a solder pad so you can connect it to the case.

Gustav

 

[inf0]

Not sure what you are asking, so Ill just say this.

Grounds are

Relay grounds.
Audio (from XLRs - you can omit this, if you ground them to case direct - we will know down the line what works better)
0 (general GND for opamps etc)
PSU the ground running through the pour in the PSU section
DRV - grounds on the buffer for VCA driver, which are a little sensitive in this design.

Theres a solder pad so you can connect it to the case.

Gustav

So from my understanding , jumper all pads for AGND / 0V/ Relay / PSU / DRV . And use the big pads to connect to the case as star grounding?

I don't understand which one to ommit in case we connect them to the case direct

Grounding is my nemesis , learning a lot everyday as well !

 

[Andado]

Not sure what you are asking, so Ill just say this.

Grounds are

Relay grounds.
Audio (from XLRs - you can omit this, if you ground them to case direct - we will know down the line what works better)
0 (general GND for opamps etc)
PSU the ground running through the pour in the PSU section
DRV - grounds on the buffer for VCA driver, which are a little sensitive in this design.

Theres a solder pad so you can connect it to the case.

Gustav

Okey I took a break and some dinner. Came back and read it again and now I understand

 

[Gustav]

So from my understanding , jumper all pads for AGND / 0V/ Relay / PSU / DRV . And use the big pads to connect to the case as star grounding?

I don't understand which one to ommit in case we connect them to the case direct

Grounding is my nemesis , learning a lot everyday as well !

Just put jumpers in all of them.

If you commit a pin 1 from an XLR to case direct, you can omit the one marked AGND

Gustav

 

[inf0]

Just put jumpers in all of them.

If you commit a pin 1 from an XLR to case direct, you can omit the one marked AGND

Gustav

Thank you !

 

[Andado]

Is there any recommended gauge size for the cables for Vu meter? Pots? Etc
And how big fuse in the IEC? 250V a?

 

[Andado]

@Gustav can we have a Gerber export whit the designator instead of values in the top silkscreen? Think I got the R59,R60 wrong. Thanks.

 

[inf0]

@Gustav can we have a Gerber export whit the designator instead of values in the top silkscreen? Think I got the R59,R60 wrong. Thanks.

Let's wait for Gustav to confirm but from what I've saved , those are R59+R60 . That need to be replaced with a jumper or 0R resistor

 

[JMan]

Is there any recommended gauge size for the cables for Vu meter? Pots? Etc
And how big fuse in the IEC? 250V a?

As far as wire gauge, I typically use 22awg for anything carrying signal, CV, low current DC such as LED indicators, and such; and 18awg for mains AC and PSU DC output (which I think is handled on the PCB in this case - I don't know as I haven't actually received my boards yet) and heaters in tube designs. This is NOT a scientific approach, to be clear - for example there are plenty of cases where 24 or 26awg would be fine for signal, etc etc, you could certainly do the math on any given wire connection and make that determination more precisely, but the approach I described above is good for the average situation (certainly for the GSSL) and provides the benefit of only requiring me to have a regular stash of two different wire gauges on hand.

 

[Andado]

As far as wire gauge, I typically use 22awg for anything carrying signal, CV, low current DC such as LED indicators, and such; and 18awg for mains AC and PSU DC output (which I think is handled on the PCB in this case - I don't know as I haven't actually received my boards yet) and heaters in tube designs. This is NOT a scientific approach, to be clear - for example there are plenty of cases where 24 or 26awg would be fine for signal, etc etc, you could certainly do the math on any given wire connection and make that determination more precisely, but the approach I described above is good for the average situation (certainly for the GSSL) and provides the benefit of only requiring me to have a regular stash of two different wire gauges on hand.

Thanks man! That sounds sweet to only have 2 variants I agree

 

[Andado]

As far as wire gauge, I typically use 22awg for anything carrying signal, CV, low current DC such as LED indicators, and such; and 18awg for mains AC and PSU DC output (which I think is handled on the PCB in this case - I don't know as I haven't actually received my boards yet) and heaters in tube designs. This is NOT a scientific approach, to be clear - for example there are plenty of cases where 24 or 26awg would be fine for signal, etc etc, you could certainly do the math on any given wire connection and make that determination more precisely, but the approach I described above is good for the average situation (certainly for the GSSL) and provides the benefit of only requiring me to have a regular stash of two different wire gauges on hand.

So a servo kabel is enough? seems cheap

 

[JMan]

So a servo kabel is enough? seems cheap

I think servo is usually 22awg, so basically yes. I think that servo differs from typical hookup wire in that it uses thinner strands but more of them to create the same overall diameter. For our purposes, that would just mean you'd want to be mindful when stripping the ends (thinner strands might make it easier to clip a few by accident). But I see no reason you couldn't use it.

 

[Andado]

I think servo is usually 22awg, so basically yes. I think that servo differs from typical hookup wire in that it uses thinner strands but more of them to create the same overall diameter. For our purposes, that would just mean you'd want to be mindful when stripping the ends (thinner strands might make it easier to clip a few by accident). But I see no reason you couldn't use it.

Any big difference to use a shielded labeled audio cable 24awg (4in1) ? I can get both of the cables from a local store. Or am I overthinking this now? I just want GOOD QUALITY stuff in my new baby

 

[Gustav]

Any big difference to use a shielded labeled audio cable 24awg (4in1) ? I can get both of the cables from a local store. Or am I overthinking this now? I just want GOOD QUALITY stuff in my new baby

You are overthinkinging it.

The resistors you want to verify. Use your meter set to continuity, find the connected opamp, and check for connections to opamps terminals.



Gustav

 

[JMan]

Any big difference to use a shielded labeled audio cable 24awg (4in1) ? I can get both of the cables from a local store. Or am I overthinking this now?

I'd use the servo, personally. Nothing wrong with the four conductor shielded cable, but you'll have connections that don't require four conductors and the shield is probably unnecessary in this design (and it adds an additionally consideration - does it need to be grounded at one end? Maybe or maybe not, and if so, where will you make that connection?)

 

[Andado]

I'd use the servo, personally. Nothing wrong with the four conductor shielded cable, but you'll have connections that don't require four conductors and the shield is probably unnecessary in this design (and it adds an additionally consideration - does it need to be grounded at one end? Maybe or maybe not, and if so, where will you make that connection?)

Yeah you are right! I will buy the servo cables. Thanks JMan!

 

[Andado]

You are overthinkinging it.

The resistors you want to verify. Use your meter set to continuity, find the connected opamp, and check for connections to opamps terminals.

Gustav

Yes was doing that but in the wrong place on the board but this pic is the way right? Edit: Ok I saw your edited answer whit pic and the same pic I attached. Thanks Gustav