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I might have solved the riddle. I replaced the 5V DC from the laptop sound card with a 9V battery. I connected the battery's positive to the capsule and and its negative to the ground of the audio jack which is plugged to the ground of the sound card I'd imagine. The beats are completely gone to...

The dimensions are not included in the description? Try contacting the eBay seller for some or the datasheet.

Thanks for responding. I'm sure that it's not handling noise because I left it on the mic-in socket. The noise is semi-regular in nature; it sometims comes in waves like heartbeats, other times it's silent for a few seconds. The intervals between the sounds are not constant. The room background...

Here's file.

Greetings, this is my first post here. I would need your experience on mic noise to help me out. I have yet to put the WM-61A capsule in a proper circuit, but I have used an audio jack to connect the capsule directly to my laptop computer's mic-in. It works fine, except the sporadic noise...