trashcanman
Well-known member
- Joined
- Jan 26, 2016
- Messages
- 104
I’m looking for an alternative to using expensive DIs for protecting devices from accidentally being fried by phantom power from a mixer. I’ve done some googling and found that a passive RC highpass filter seems to be the way to go, such as This.
Is this a reliable design? I don’t know much about phantom power but it seems that should work and is commonly used for removing DC offsets, which I think is what phantom power is essentially. I’m intending to build a bunch myself and I think if I can get the board size down I can cram it into a cheap XLR coupler.
Using film or ceramic capacitors instead of electrolytic would help to reduce the space needed so I was wondering if doing so would change the filter characteristics? Doing some basic simulation suggests it would perform the same but I thought I'd consult the hivemind.
Is this a reliable design? I don’t know much about phantom power but it seems that should work and is commonly used for removing DC offsets, which I think is what phantom power is essentially. I’m intending to build a bunch myself and I think if I can get the board size down I can cram it into a cheap XLR coupler.
Using film or ceramic capacitors instead of electrolytic would help to reduce the space needed so I was wondering if doing so would change the filter characteristics? Doing some basic simulation suggests it would perform the same but I thought I'd consult the hivemind.