48v Phantom power Working :)

A project log for Multichannel Audio DSP Field Mixer Recorder

bluetooth app controlled professional portable DSP mixer.balanced audio IO,phantom power,flexible routing,ISO recording. timcode. AVB audio.

ben bilesben biles 10/05/2015 at 09:220 Comments

Phantom power is working and is rock solid :)

Highly acurate as you can see from the high tech volt meter !!! really need to buy some proper test equipment.. its on the list of things to do.

I used an LT8570 IC wwith some 5% capacitors and 1% resistors.

I had to double up some resistors to get the values.

At first I soldered some resisitors in parralel !! ooops , then thought about it again and re organised them in series to get the values i needed...

the circuit works from 9v - 16v input accuratelty and has very low noise.

Its maximum output is about 50ma, so should be fine for now, I might need to increase the power output since there could be 8 channels running phantom power !!

I have just ordered some resettable polyfuses 60v 50ma trip to protect against XLR cable shorts and dodjy defective microphones :) !!

Adding more cicuit protection on XLR inputs against bad incomming current too.