groupDIY 500 series mechanical specifications

[sahib]

sorry for the confusion, GndB is Power Ground....
pin 13 of Edac Connector.
GndA is pin 5.

till now I haven't had any problems connecting both GndA and PwrGnd at 0v
also for xlr pin 1 using GndA, and safety Earth to chassis only, just for testing its behavior
signal is very clean and also the last module plugged close to psu presents no issues

I apologize to everyone if my questions and requests are in a post where only mechanical infos should be shared
but I think it is useful for those who want to go for a psu like this in a DIY lunchbox and so don't make any mistakes

best

No case for an apology.

I am glad that it is working fine.

 

[sahib]

In my limited experience , a kind of mechanical connection "standard" between the front panel and L bracket or something similar would help a lot with alignment issues and the odd potentiometers sticking out. It seems like an L bracket is kind of a luxury in the DIY 500 series world

Since the front panels have limited real estate , having nuts visible is not the prettiest of sights. Some knobs definitely cover those but others barely do

Seems like it would be a relatively easy undergoing for someone here !

Here you mean the backplate on which the PCB is mounted and the fixing between the backplate and the front panel (which we call faceplate).

On our modules the backplate is fixed to the faceplate through threaded inserts/standoffs that are inserted into the faceplate. You can not standardise such fixing as the locations of the standoffs will be dictated by the front panel layout.

 

[soulsonic]

I tested out my idea of doing it all in acrylic and it seems to work well. I'll post details when I have a finalized one to show off.

 

[RSRecords]

sort of dumb 500 series question.
What sides should the card edge pads be on for a module? I'm assuming best would be both (with a via from top to bottom pcb).
but does it matter as most racks seem to have pins on both sides of the edge connector socket?

 

[sahib]

Always have it on both sides for reliability. It does not cost extra unless your design is particularly single sided.

Also do not omit any fingers. This again does not cost extra. I have seen a number of modules with fingers missing (for example PIN 3, 7, 9 and 11). Very bad design decision.

 

[MidnightArrakis]

sort of dumb 500 series question.
What sides should the card edge pads be on for a module? I'm assuming best would be both (with a via from top to bottom pcb).
but does it matter as most racks seem to have pins on both sides of the edge connector socket?

[What sides should the card edge pads be on for a module?] -- BOTH SIDES!!! ..... In today's world, there is no such thing as a "single-sided" PCB. Long ago.....YES!!! Today???.....NO!!! And, if you were to design and have fabricated a "single-sided" PCB, it would start-out as a "double-sided" PCB anyway and then the fabricator would have to etch-off all of the copper on one side and watch the copper wash down the drain!!! Not only THAT, but.....you're still paying for all of that copper that is swirling down the drain!!! Howz dem apples for ya???.....

So.....just go ahead and design yourself a "double-sided" PCB with edge-fingers on both sides. Then, right where the tracks terminate into the edge-fingers, place at least -- TWO -- vias right there to connect both sides of the edge-fingers together. In fact, you could go ahead and place 3 or 4 vias right there, not only to have some redundancy, but to also lower the overall total via resistance and inductance as well. In one sense, you need to think of the via "barrels" as being like resistors. Due to the tiny drill-hole size, there's a resistance right there. And, just like any parallel resistors, the more you have in parallel with one another, the lower the total resistance value will be.

When I am running fat "Power & Ground" tracks on a PCB and I need to change to a different layer, I usually place at least 4 vias at the layer-transition point, not only to try and maximize the electrical energy transfer going through the vias to another layer, but to also reduce the overall via resistance and inductance. You gotta think.....the via resistance of using 4 vias is 1/4th the value of a single via!!! However, the major downside is.....there may not be the room available for extra vias.

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[john12ax7]

The API way is to have the edge finger pads on the bottom. You can either do that or have them on both sides. Though I have heard of some racks that incorrectly connect the edac to only the wrong side.

The edge fingers should be hard gold plated which adds significant cost. I do not agree with the above comments that you should automatically just do both sides. It would depend on your own cost benefit analysis.

 

[MidnightArrakis]

Yes I have seen them. Thank you very much for doing that. I am now just working out if I can print my own with a nice built in logo. Unfortunately they are too big for my current 3D printer. I may have to upgrade it. Work in progress.

Cheers

Ian

>> Speaking of -- STL -- files.....I thought you would find this unique website to be of interest!!! The link I have included below goes to a website-page that contains nothing but -- 3D-printable STL-files -- of mixer/mixing-console fader knobs!!! How does THAT grab ya???.....

https://www.stlfinder.com/3dmodels/fader-knob/?page=1




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