This is the karaoke mic input electonics board.
There is much there is to it, just some transistors, capacitors and resistor. These circuits are need to properly operate the dynamic karaoke mic. They provide the voltage and preamplication needed.
Like most consumer and home electronic appliances, the circuit board is the cheaper brown type not the more expensive multi layer epoxy glass fibre boards you find in industrial grade equipment or your home pc.
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