Hum noise occurs from a microphone in a 50-Hz portion.
※Since hum noise will be lost if it changes into a microphone without a lerdless(non-cable), I think that it has generated from the microphone.
The circuit diagram of the microphone circumference is attached to below.
If there is the method of improving with a register or parts, please let me know.
(Is the solution by a device difficult on the problem of wiring?)
※I'm checking for the spec of register, filter,etc.
Best regards,
Satoshi
