What causes the humming noise from these microphones? Even if I only use a battery on the preamplifier, the noise will not dissapear. Is this noise caused in the preamplifier or is it general to these kind of microphones? Are there any differences between cheap and more expensive microphones?
The noise dissapear if I lower the voltage to under 2V, but that also reduce the effect very much.
Are there anybody here who can help me with this problem?
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