AT4050 phantom power question
I would like to understand the 48VDC phantom power requirements for the AT4050.
I assume that pin 1 should be the ground for the 48VDC, but is the + side of the 48V DC pin 3?
DC phantom power is transmitted simultaneously on both pin 2 and 3, with the shield (pin 1) being the ground. Since the DC voltage on the ‘hot’ and ‘cold’ pins (2 & 3) is identical, it is seen by equipment as “common mode” noise and rejected, or ignored, by the preamp or mixing board. This wiring also prevents damage to dynamic microphones that don't require phantom power when they're mistakenly hooked up to phantom power. That's assuming everything is wired correctly!
If you go to your mixer and put a volt meter on pins 1 & 2, or pins 1 & 3, you will see the 48v DC, but if you meter pins 2 & 3 (the audio signal path) you will see no voltage difference since they are both 48v above ground.
6 years, 3 months ago