Need help at combined RCA/XLR Input

[DosenZorn]

Hello,


I'm currently designing an 5 source input board. Therefore I'd like to have one RCA and one XLR Input for each source. Is there a way to combine RCA and XLR Inputs without a physical switch or a jumper or a piece of wire inserted into the XLR Connector?


I found Rod Elliotts Circuit for a balanced line input circuit transforming balanced input to unbalanced output.

Source: Balanced I/O


Is it possible to wire the circuits output with the RCA Input connector? Obviously you should then only connect either RCA or XLR, but that's exactly the way I would like to have it.


Each channel would have one of these circuits for each left/right channel, which are then switched by relays on one unbalanced output. I have no problems with the relay channel switching. I just need to know if the above explained way of connecting XLR and RCA per channel per source together would work.


After the boards output a Muses Volume Control and the unbalanced B1K Preamplifier are planned.



Thanks in advance.
With best regards DosenZorn

 

[indianajo]

Peavey buys sockets that will both accept an XLR, and a 1/4" mono phone plug. It is installed on the cs800s. 2 & 3 parallel the tip and shaft. You can convert the 1/4" phone plug to a RCA socket with one adapter.

 

[MAAC0]

Yes, Use TRS jacks instead of XLRs

1/4" Stereo Jack - PCB Mount - Chrome Nose

You short ring & ground on the left side for RCA use & when You insert a jack it becomes balanced because the short is removed.

If I'm not mistaken Douglas Self addresses this on his small signal design handbook book related to the Cambridge Azur but I'm not sure..

 

[Hicoco]

From Douglas Self, i don't remember where i find it....

 

[DosenZorn]

That's exactly what I was searching for. Thank you very much. That's even less parts. Hopefully those OpAmps are still in production or at least to find at a reasonable price. But I'd guess they are nothing special and can be replaced with Opa134s or something.