Phantom Power pass through ?

[XavierM]

Hi all !

I've been wondering for a bit : generally you'd have a Mic preamp feeding 48V to the mic, followed by all sort of equipment.

But what if I want to introduce a little compressor of my design between an audio interface and and the mic ? Could it be possible to remove the DC coupling at at the signal output of my compressor and have the 48V be sent to the microphone using several order of low pass filters ? 
Doing so I could have a little portable battery powered compressor and not have to worry about generating 48V phantom power.

I mean, in term of frequency separation it doesn't seem impossible, but I can't find exemple out there so am I missing something ?

Thanks !
Cheers !

[Bassman59]

Hi all !

I've been wondering for a bit : generally you'd have a Mic preamp feeding 48V to the mic, followed by all sort of equipment.

But what if I want to introduce a little compressor of my design between an audio interface and and the mic ? Could it be possible to remove the DC coupling at at the signal output of my compressor and have the 48V be sent to the microphone using several order of low pass filters ? 
Doing so I could have a little portable battery powered compressor and not have to worry about generating 48V phantom power.

I mean, in term of frequency separation it doesn't seem impossible, but I can't find exemple out there so am I missing something ?

Thanks !
Cheers !

Audio line-out transformers from Jensen (now owned by Radial) and others work well for this. Also adding DC blocking capacitors after the output driver chip is standard. 100 uF ought to work, just make sure they're rated for at least 63 WVDC.

[XavierM]

Great !

thank you I'm gonna check this out !