Hi All,
is it possible to use the 48V of phantom power to power an arduino? I understand you would have to step down the voltage but is this feasible? a google search isn't throwing up many results.
thanks in advance
Hi All,
is it possible to use the 48V of phantom power to power an arduino? I understand you would have to step down the voltage but is this feasible? a google search isn't throwing up many results.
thanks in advance
Current may be an issue... If you can find the spec for your preamp or interface, try to find out how much current it can supply. And, either measure or estimate the amount of current your Arduino circuit is drawing.
Wikipedia says:
The IEC standard gives 10 mA as the maximum allowed current per microphone.
10mA isn't enough for the Arduino, but with a switching regulator you can get nearly 100% efficiency, so by regulating-down to 5V you might be able to get nearly 100mA and that might be enough.
AFAIK most microphone preamps use 6k8 current limiting resistors, one per XLR pin (there are two).
Max energy transfer is at half voltage, so 7mA@24volt if you parallel both pins.
In theory you could get 30mA@5volt with a micro power DC/DC converter.
Leo..
You wouldn't want to do this because you'd get severe audio interference fed back.
Microphone phantom power has to be ultra clean.
Curious why OP asked this.
Leo..
Im building something to be used in an audio environment which would take in a signal on an XLR connector anyway, so it made sense to try and power it this way as well!
Not if its noisy digital circuitry... You don't want that getting onto a microphone level signal in any way.