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Old 25th October 2003, 04:20 PM   #1
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Default XLR Convertor

I'm new to PCB designing and I'm trying to design a XLR->RCA convertor using Elliott Sound schematic:

This is what I have draw so far using Eagle:

I will using OpAmp OPA2134P.

any comments will be welcomed.

Francois
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Old 25th October 2003, 04:21 PM   #2
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Here is the PCB
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Old 25th October 2003, 04:24 PM   #3
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And here is the schematic.

Like I said it can look crappy, i'm starting =)

all the ground is connected to pin 1 but, pin 1 from the XLR connector will not be connected to the pcb but to the chassis only, as suggested by rane notes.
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Old 25th October 2003, 05:06 PM   #4
grataku is offline grataku  United States
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Yes, it needs a little work:
a) shrink the size it by moving the input resistor and the cap
b) more importantly, look up the datasheet of the opamp you plan to use and see what they use for decoupling caps and do the same.
They should be mounted ACAP to the pins of the IC and look out for their GNDs make them AShortAP to the star GND and separate form the signal GND
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Old 26th October 2003, 03:19 AM   #5
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Quote:
Originally posted by grataku
Yes, it needs a little work:
a) shrink the size it by moving the input resistor and the cap
b) more importantly, look up the datasheet of the opamp you plan to use and see what they use for decoupling caps and do the same.
They should be mounted ACAP to the pins of the IC and look out for their GNDs make them AShortAP to the star GND and separate form the signal GND

Here is a shinked version. I check the datasheet for recommended decoupling caps and don't find the information...maybe it just me that is too tired to find it

Again, comments are welcome =) I will use this pcb to interface a x-over with XLR output with a amp with RCA connection (don't ask why =)). after that I will do a PCB with 5 Input and a other PCB with 5 input. One for my soundcard and the other for my 5ch gain clone i'm working on ( with a CNC machined case =))

Francois
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