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Stereo 3.7W Class D Audio Amplifier - MAX98306

Stereo 3.7W Class D Audio Amplifier - MAX98306
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Stereo 3.7W Class D Audio Amplifier - MAX98306Stereo 3.7W Class D Audio Amplifier - MAX98306Stereo 3.7W Class D Audio Amplifier - MAX98306
Our Price:  £9.00(Inc. 20% VAT)(£7.50 Exc. VAT)Earn 9 Loyalty Points
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SKU:  PPADA987
Part Number:  987
Brand:  AdaFruit

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  (1 Review)

This incredibly small stereo amplifier is surprisingly powerful - able to deliver 2 x 3.7W channels into 3 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.7V-5.5VDC. Since the amp is a class D, its incredibly efficient (over 90% efficient when driving an 8Ω speaker at over a Watt) - making it perfect for portable and battery-powered projects. It has built in thermal and over-current protection but we could barely tell it got hot. This board is a welcome upgrade to basic "LM386" amps!

The inputs of the amplifier go through 1.0uF capacitors, so they are fully 'differential' - if you don't have differential outputs, simply tie the R- and L- to ground. The outputs are "Bridge Tied" - that means they connect directly to the outputs, no connection to ground. The output is a 360KHz square wave PWM that is then 'averaged out' by the speaker coil - the high frequencies are not heard. All the above means that you can't connect the output into another amplifier, it should drive the speakers directly.

Comes with a fully assembled and tested breakout board with 1.0uF input capacitors. We also include header to plug it into a breadboard, 3.5mm screw-terminal blocks so you can easily attach/detach your speakers, and a 2x4 header + jumper to change the amplifier gain on the fly. You will be ready to rock in 15 minutes! Speakers are not included, use any 3ohm or greater impedance speakers.
 

  • Output Power: 3.7W at 3Ω, 10% THD, 1.7W at 8Ω, 10% THD, with 5V Supply
  • Passes EMI limit unfiltered with up to 12 inches (30 cm) of speaker cable
  • High 83dB PSRR at 217Hz
  • Spread-Spectrum Modulation and Active Emissions Limiting
  • Five pin-selectable gains: 6dB, 9dB, 12dB, 15dB and 18dB. Select with a jumper or by setting the G and G' breakout pins (see schematic for breakout board showing gain pin settings for details)
  • Excellent click-and-pop suppression
  • Thermal and short-circuit/over-current protection
  • Low current draw: 2mA quiescent and 10uA in shutdown mode
Dimensions (without 0.1" header):
  • Length:28.25mm/1.11in
  • Width:24.15mm/0.95in
  • Height:3.03mm/0.12in
  • Weight:2.33g



Downloads:

MAX98306 Datasheet

Schematic for breakout board showing gain pin settings

Cant see the video? Click Here to view on our YouTube Information channel


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Customer Reviews
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Simple, effective, value for money
Thursday, 15 October 2015  |  Programify

I've just completed a project that required 4 audio (mono) channels to be amplified to drive 4W exciters. Two of these modules saved me the effort of making 4 of my own amplifiers. Although there's only one volume/gain control, I used the jumper pins to s

 

3 of 3 people found this review helpful.

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