dawsonaudio
Well-known member
Hi there.
I've got an issue going on with my phantom power/or maybe it's normal.
I've got an 8 channel rack of 312 style cards that I built some years back. I just replaced an op-amp and did some voltage testing before I re-racked. I noticed that when I turned on the 48volt supply, I'm only getting about 46 at the xlr inputs. I'm pretty sure it measured 48 prior. The voltage at the input to the mic preamp connector is 48volts. I also noticed that when the 48volt was turned off, there was 1.39vdc still left at the xlr input(measuring from pin1 to pin2 and pin1 to pin3).
Is this normal operation?
Thanks,
Nate
I've got an issue going on with my phantom power/or maybe it's normal.
I've got an 8 channel rack of 312 style cards that I built some years back. I just replaced an op-amp and did some voltage testing before I re-racked. I noticed that when I turned on the 48volt supply, I'm only getting about 46 at the xlr inputs. I'm pretty sure it measured 48 prior. The voltage at the input to the mic preamp connector is 48volts. I also noticed that when the 48volt was turned off, there was 1.39vdc still left at the xlr input(measuring from pin1 to pin2 and pin1 to pin3).
Is this normal operation?
Thanks,
Nate