Wiring Help

[Davebassman]

Anybody can help me with this 1/4 jack wiring?

http://jhaible.com/legacy/subtle_cho...o_balanced.pdf

I found the Switchcraft 113EPCX. the schematic would be like this?

[Davebassman]

Hi Dave....

It is not that simple. Your XLR is a low impedance input and you are trying to connect that across a high impedance input. I believe you'll need a matching transformer.

I had a similar question in this thread - please review my thread Peavey Booster Amp Input - The Impedance Matching Transformer Feeding The Input.

I didn't design anything. This is the original design by Haible...

[g1]

Yes, your 1/4 inch jack wiring should do the same.
There is just the issue of the xlr numbering error on the original pdf drawing. Not sure if they numbered the pins wrong, or drew the pin #'s in wrong location.

[Davebassman]

I would think that it's a mistake with the number and not with the wiring. How can I check? Anyway, I'm confused with the jack switch wiring part. I draw a schematic to help me understand it. It's correct?

Thanks.

[g1]

Yes, the jack switch wiring matches the original.
To check the xlr numbers, see which input xlr pin (2 or 3) goes to the center pin of connector IN1.

[Davebassman]

Yes, the jack switch wiring matches the original.
To check the xlr numbers, see which input xlr pin (2 or 3) goes to the center pin of connector IN1.

http://jhaible.com/legacy/subtle_cho..._sch_dwg3a.pdf

http://jhaible.com/legacy/subtle_cho...ge_overlay.pdf

pin 1 is gnd. But I'm not sure about the other two.

original Roland SSD-320 schematic

https://www.synthxl.com/wp-content/u...rvice-note.pdf

Comparing the two schematics. The original Roland. XLR pin 3 goes to the jack tip. So, I think that the pins numbers on the Haible schematic are ok, seems that the pin distribution is wrong. What do you think?

About the jack connectors. I need they are isolated? to avoid chassis ground?

[g1]

If this is something you are building that is supposed to be like the Roland, then do it like the Roland. That means your xlr numbers on your drawing should be changed to match the Roland. I have no idea whether the Roland used insulated jacks or not.

[The Dude]

Just an FYI: Although not followed by all (Carver for 1), The industry standard for XLR wiring is Pin1- gnd, Pin 2 - hot, and Pin 3 - neutral.