Question 1

How do you connect this to an arduino uno? Which pins go to which on the arduino board.

Accepted Answer

A lot of it depends on how you've written your program, because that's where you specify certain pins.  If I remember correctly, you will want to specify that the "out" (on the microphone) goes to one of the Analog-to-Digital (ADC) pins--on an UNO, that's A0 through A5 (you'll specify that in your code).  You'll want either the 5V or 3V3 on the Uno to connect to VCC on the mic; GND on the mic to one of the ground pins on the Uno.

The "gain" pin on the mic depends on how much gain you want; if you don't connect it, you'll get 60dB of gain; connect it to GND on the mic for 50dB, and connect it to VCC on the mic for 40dB.  I recommend you check the results of each to see which one works best for your needs--high gain will pick up every little noise & detail in music, whereas less gain will make the differences between loud & quiet sounds more obvious;  it's basically equivalent to 'normalization' in music.

Finally, the AR pin is for the "Attack/Release" ratio, which defaults to 1/4000; this basically determines how quick the mic is to 'react' to sounds, and the default is the most 'reactive' setting.  If you want to make it a less so, connect it to either the VCC pin or GND for different settings; odds are good that you'll be happier with the original. 
 
You can get the details by downloading the pdf here:  https://learn.adafruit.com/adafruit-agc-electret-microphone-amplifier-max9814/

Question 2

I want to use it as a p.a. mike. How do i wire it for another amplifier stage?

Accepted Answer

If your p.a. amp has a mic input, I don't think you will need any more amplification. The AGC has a very wide range.

Question 3

I need to feed the output into a 1w 8 ohm speaker. Will this work for that ?

Accepted Answer

You will probably need a 1 watt audio amp to drive the speaker.

Question 4

Since this mic has auto gain, does that mean it wouldn't be useful for determining sound levels?

Accepted Answer

You can hard-set the gain by wiring the pin to V++ or ground

ASIN	B00SLYAI9K
Antenna Location	Voice Recording, Video Recording
Audible Noise	60 Decibels
Audio Sensitivity	30 Decibels
Best Sellers Rank	#227,934 in Electronics ( See Top 100 in Electronics ) #54 in Microphone Elements #1,313 in Audio Component Amplifiers
Brand	Adafruit
Built-In Media	Amplifier
Color	Multicolor
Compatible Devices	Amplifier
Connectivity Technology	XLR
Connector Type	XLR
Customer Reviews	4.5 4.5 out of 5 stars (103)
Enclosure Material	Plastic
Frequency Range	20 hz 20 khz
Frequency Response	20 KHz
Hardware Platform	Sensors
Impedance	2000 Ohms
Item Dimensions	2.36 x 0.59 x 3.94 inches
Item Weight	0.01 Pounds
Manufacturer	Adafruit
Mfr Part Number	FBA_ADA1713
Microphone Form Factor	Mini
Model Name	FBA_ADA1713
Model Number	ADA1713
Number of Channels	1
Polar Pattern	Unidirectional
Power Source	Corded Electric
Signal-to-Noise Ratio	60 dB
Special Feature	Automatic Gain Control
UPC	748347526912 711978442593
Unit Count	1.0 Count

Adafruit Electret Microphone Amplifier - MAX9814 with Auto Gain Control [ADA1713]

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