I've been trying to diagnose why my condenser mic keeps buzzing for ages.
I'm running it through an audio interface, but it still had a noisey 'buzz' that sounds like a very common electric hum (near large electric transformers). This also occurred when run through a laptop running on batteries (with the AC input / charger disconnected).
Strangely the buzz would get stronger if I got near to the mic with my face / body.
If I touched the mic or the audio interface the sound would dampen significantly (but return to the normal behavior once I removed contact).
I was trying random things today and then by accident I touched the mic grill with a screwdriver, and the buzz immediately went away and now it's crystal clear (even without keeping contact with the screw driver).
What on earth is the cause of this? Is it some static build up? Incorrectly grounded?
It previously worked crystal clear the other day. The buzz / interference is either significant in effect, or completely unnoticeable, with nothing in between.
I'm just so glad I found a solution to this.