In my final circuit, I've adjusted the resistor choices to account for the voltage drop on the phantom supply when under load. I'm aware I can buy XLR->Plugin Power adaptors, but they're pricy, as are lapel mics designed to plug into phantom.Īlso, I kinda want to see if there's a simple solution.! The mic works fine with the Zoom's plugin-power input (2.5v), giving a surprisingly good signal with very little noise, but I want to connect several to the H5, so need to use the XLR inputs (also want to use an H5 capsule, which the plugin-power socket disables). I'm using a Zoom H5, so have a choice of 12-48v phantom. I'm trying to connect a cheap ($1 ebay special) electret mic to an XLR mic input, and power it with phantom power. The capacitor would prevent the phantom power on cold being shorted to ground, whilst allowing audio to pass.

I'm expecting the resistor to limit the current/voltage to the mic, and attenuate any audio signal going to the ground. What disadvantages does it have compared to a more complex design such as those at, and are there any simple alterations to improve it? Any rough suggestions for component values? It's got a TRS plug, though T&R seem to be shorted.ĮDIT: the mic claims to have an impedance of 2.2KΩ Max.ĮDIT: the circuit works, using 12v phantom, with a 100nF cap and a 10k resistor.

I assume the lav mic has a typical electret capsule / JFET type arrangement. Will this circuit work to connect an lapel mic mic (expecting ~2.5v plugin/bias power) to an XLR input providing phantom power (I have a choice of 12 to 48v).

Connect 48v phantom to ibooster