I'm repairing my simple wired headset which is composed of two little speakers and one microphone. The audio and mic jacks are separate. The speakers work fine. But the microphone is very noisy. As I was playing with wires, I found out that when I touch both ends of the speaker wire, the microphone noise goes away. Short-circuiting the speaker wire alone won't work. I have to literally touch the wires. This is rather bizarre to me. Do you have any idea what should I do?
I have seen this happening in lamps flickering too. The moment I touch the metal body of the lamp holder, the flickering goes away :-/