K472 Low Noise Electret Microphones Amplifier Board Module Replace MAX9812

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K472 Low Noise Electret Microphones Amplifier Board Module Replace MAX9812
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Product Introduction
Description:
End of ultra low noise electret microphones pre-amp amplification board, using ST imported K472 electret microphones special amplifier chip, chip with low noise. Gain adjustable, power supply wide,and can be difference output, can also be single-ended output.
Gain adjustment: resistance R3 is gain adjustment resistance, when the default delivery is 30 db (resistance to 1 k), if not appropriate, can consult the table below change R3 resistance to obtain different gain, changes the resistance when the need to take off the original R3 SMD resistor (if you feel bad patch welding, welding the R3 can also use the plug-in beside two reserved welding plate above (gain is 0 to 40 db variable).
Microphones connected: microphones positive + and negative -, GND on the board as a shield, don't need connected microphones (also can not meet, meet, but it is better to avoid interference)
Output connection:
1: difference Output: connect signal +, -, middle is GND grounded.
2: single-ended output: connect signal +, middle GND connect grounding
3: Dual -channel output : signal +when a channel, signal - when a track, GND grounding in the middle
Three kinds of output connection can choose according to need
Operating voltage: DC 2.3 v to 5.5 v
The board size: 25 mm * 20 mm
Note:
the board power supply had better not use the switch power supply, otherwise the low noise, interference may be serious.
Package included:
1PCS K472 Low Noise Electret Microphones Amplifier Board For Differential Single-Ended Output
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If is item is defective in 12 months, you can return it to us. We will send you a new replacement after receiving the defective item.