KAmodMIC ELECTRET

Description

KAmodMIC_ELECTRET is a module with electret microphone KPCM6B type. Thanks to embedded amplifier with hundredfold amplification of signal, output voltage can be measurement with using e.g. ADC converter in microcontroller. Module can be used by noise sensor or  monophonic VU-meter as well.

Basic features and parameters

• Microphone KPCM6B-P type from KEPO
• Embedded LMV321L amplifier from STMicroelectronics
• Rail-to-rail amplifier type with hundredfold amplification of signal from microphone
• Power supply voltage: 2.7V - 6V
• Output voltage of module in silence is equal to a half of power supply voltage
• Embedded low-pass filter with cutoff frequency 10.6kHz
• Place for soldering of pin header
• Mounting holes 3mm
• Module size (without connector): 22.5mm x 9.3mm x 8mm

Standard equipment

Code	Description
KAmodMIC_ELECTRET	Assembled and launched module 3-Pin header (male and angle) for own soldering

Electrical schematic

Outputs description

	JP1	Function
	VCC	Module power supply
	GND	Ground of power supply / signal
	OUT	Signal output

Signal output

KAmodMIC_ELECTRET module has embedded amplifier, which can increase the signal from electret microphone hundredfold. Constant value of amplifier is a half of power supply voltage and signal amplitude depends on noise level in environment. On photo below is shown examples sinusoidal sound, which was received with using KAmodMIC_ELECTRET (power supply 3.3V).

External links

• LMV321L chip datasheet