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Phantom power problem.

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Phantom power problem.

PostPosted: Thu Apr 08, 2021 2:40 pm
by pa28
Just seen an interesting SOS article on the Faeicesbook about this problem,

I have this problem with my old focusrite Trakmaster Pro, the curious problem is that with 48v applied there is nothing no response on the input meter, when I switch the 48v off the mic works for a few seconds as if a capactior is supplying and running down any ideas? Not averse to having a go at fixing it if a simple enough job.

Re: Phantom power problem.

PostPosted: Thu Apr 08, 2021 2:50 pm
by BJG145
Just looking at some ideas here:

https://www.soundonsound.com/techniques ... wer-faulty

I don't suppose you have a different unit that could provide phantom power, or a different cable, just to eliminate those...? Hugh also explains how to use a multimeter to test.

Re: Phantom power problem.

PostPosted: Thu Apr 08, 2021 2:52 pm
by Wonks
Have you got a multimeter so that you can measure voltages at the end of the mic XLR cable?

Re: Phantom power problem.

PostPosted: Thu Apr 08, 2021 3:11 pm
by pa28
I do have a few multi-meters and will hunt around for a spare XLR to plug in and check out those pins...

Re: Phantom power problem.

PostPosted: Thu Apr 08, 2021 3:14 pm
by pa28
BJG145 wrote:Just looking at some ideas here:

https://www.soundonsound.com/techniques ... wer-faulty

I don't suppose you have a different unit that could provide phantom power, or a different cable, just to eliminate those...? Hugh also explains how to use a multimeter to test.

Yep I do, a Focusrite Saffire Pro 40, so assured the mic's and cables are ok.

Just a real puzzle why there is a few seconds of power after switch off of 48v :roll: .