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Adafruit 2.8W Class D Audio Amplifier with AGC – I2C

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Quoting product code: A53QN


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About this product


  • Perfect addition to any audio project
  • 2.8W with 4 ohm speakers, 1.7W at 8 ohm
  • Selectable gain from -28dB to +30dB over I2C

Product overview

• Perfect addition to any audio project
• 2.8W with 4 ohm speakers, 1.7W at 8 ohm
• Selectable gain from -28dB to +30dB over I2C
• Speakers not included
• Soldering required
• Arduino library available here
• Support page available here

Great performance for power consumed
This is a compact stereo amplifier with automatic gain control for all of your musical and sound generating needs in an Arduino project, and is easily controlled over I2C.

Thanks to the Class D amplifier there is less heat generated, which saves power and provides an incredible 89% energy efficiency rating with 8 ohm speakers using a 5V suppler. Provides you with two 2.8W channels using 4 ohm speakers, or two 1.5W channels using 8 ohm speakers.

How to pick the right speaker
You need to ensure that the wattage of the speakers is greater than that of the wattage being fed through. This amp is designed mostly for 4 ohm and 8 ohm speakers, higher ohm speakers may be used but will generate a large amount of heat.

Does this require an Arduino?
An Arduino is not required. This amplifier may be used independently and will provide a 6dB gain and benefit from the aid of the AGC. A microcontroller is advised for it to be configured as it is quite powerful, but this is not required.

What Arduino library will I need?
Adafruit have provided their own library to make this amplifier work seamlessly, available here. This will be used for AGC configuration, gain, turning individual channels or the whole system off – all over i2C.
Tutorial and support pages avialable here.

Rated 4 out of 5 by from Good well made Sturdy , small, works well, easy to use, well labelled pinouts
Date published: 2016-08-28
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Dimensions & Weight









Product Specifications


Open source

Pin Outs:


Operating Specifications






Package Contents:

1x Adafruit 2.8W class D audio amplifier board
1x Header




Warranty Type:





Assembly Required:


Soldering Required:


Can I use this device to amplify the output from a microphone and connect it to headphones to hear the amplified sound? G.Gale

Asked by: Gerald
As much as we would love to be able to help here, as Technical Support Advisors we cannot offer design project advice or assistance, we are more than happy to locate products and support you with your purchases but we are not able to design entire circuits or projects for you. If you do have the design/circuit information detailing the value of the components needed we will be happy to locate these for you.
Answered by: Dominic
Date published: 2015-12-10

Adafruit amp. Can you explain in more detail how I connect L and R amp "Bridge tied". I have one mono output from my preamp and one 4 " speaker. What is the advantage? How do I connect the preamp and the speaker to the amp.? Thank you, Henri.

Asked by: Henri R
I have connected the - R and - L inputs as suggested in the overview and the input signal +ve to + R and -ve ( ground ) to + L. The speaker is connected to + R out and + L out. This gives me approx. double the volume as compared to using a single amp. I have also connected the two amps in "bridge tied" format. + ve signal to + R which is linked to - L and the -ve signal ( ground ) to the + L which is linked to - R. The speaker is connected to + R and + L output. This speaker must be no less than 8 Ohm and gives approx. 4 x volume.
Answered by: Henri R
Date published: 2015-08-18
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