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I have a camera with an onboard microphone. The mic doesn't work but there is a circle on the pcb marked mic1. IIs all I need do is put a jumper [wire link / resistor / ??] to get it to work? I have attached a picture.
That seems to be an odd place for a mic. That cabling is usually in a wall cavity or ceiling space. As mentioned the first pic looks like where the mic would go if fitted. In Aust it is illegal to have audio with cameras as it contravenes the Telecommunications (Listening Devices) Act