Hi audiophiles!😎
I'm completely new to this forum but I'm getting comfy here.
At the moment I'm pondering on how to convert 48V Phantom Power from XLR into a 4mA IEPE supply on BNC cable.
My measurement microphones need a 4mA constant current source (called IEPE or varying on the manufacturer also called ICP, Deltatron, CCP,...) at preferably very very low noise.
I have a very good A/D converter for microphones which provides 48V Phantom Power on 8 channels.
Is there an elegant way of solving my problem? One thought was to reduce the supplying voltage of each channel to 24 V by letting some current pass to ground via Zener diodes. (I guess the Zeners cause unnecessary noise in my curcuit?)
Then I could use a standard JFET current source to power the microphone.
An interesting IC element would also be the LT3092, a programmable CCS which I could use for each channel:
http://www.linear.com/docs/27892
A big concern for me is also that a XLR to BNC connector would short curcuit one of my XLR signal lines to ground causing a 7mA current to be lost and probably cause some unwanted feedback or noise.😱
There are some professional adapters like the one by NTI for ~ 260 USD:
NTi XL2 48V to ICP Adapter | Performance Audio
As I can't afford buying one and reverse-engineering it I'd like to call on your wisdom.
Thank you for your help,
All the best,
ultralownoise
I'm completely new to this forum but I'm getting comfy here.
At the moment I'm pondering on how to convert 48V Phantom Power from XLR into a 4mA IEPE supply on BNC cable.
My measurement microphones need a 4mA constant current source (called IEPE or varying on the manufacturer also called ICP, Deltatron, CCP,...) at preferably very very low noise.
I have a very good A/D converter for microphones which provides 48V Phantom Power on 8 channels.
Is there an elegant way of solving my problem? One thought was to reduce the supplying voltage of each channel to 24 V by letting some current pass to ground via Zener diodes. (I guess the Zeners cause unnecessary noise in my curcuit?)
Then I could use a standard JFET current source to power the microphone.
An interesting IC element would also be the LT3092, a programmable CCS which I could use for each channel:
http://www.linear.com/docs/27892
A big concern for me is also that a XLR to BNC connector would short curcuit one of my XLR signal lines to ground causing a 7mA current to be lost and probably cause some unwanted feedback or noise.😱
There are some professional adapters like the one by NTI for ~ 260 USD:
NTi XL2 48V to ICP Adapter | Performance Audio
As I can't afford buying one and reverse-engineering it I'd like to call on your wisdom.
Thank you for your help,
All the best,
ultralownoise
Did you get to do it? Aco Pacific also has a commercial solution but it would be great to have a DIY solution.
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