Stereo 20W Class D Audio Amplifier - MAX9744

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Pump up the volume with this 20W stereo amplifier! This slim little board has a class D amplifier onboard that can drive 2 channels of 4-8 ohm impedance speakers...

$42.95 AUD, inc GST

$39.05 AUD, exc GST

Available with a lead time
Expect dispatch between Apr 25 and Apr 29

Quantity Discounts:

10-25 $37.48 (exc GST)
25+ $36.31 (exc GST)

Pump up the volume with this 20W stereo amplifier! This slim little board has a class D amplifier onboard that can drive 2 channels of 4-8 ohm impedance speakers at 20W each. Power it with 5-12VDC using the onboard DC power jack and plug stereo line level into the 3.5mm stereo headphone jack and jam out with ease. Since it's class D, its completely cool-running, no heat sinks are required and it's extremely efficient - up to 93% efficiency makes it great for portable or battery powered rigs.

Adafruit like the MAX9744 amplifier at the heart of this board because its very easy to use, but it also has both analog and digital volume control capability. Use a single 1KΩ pot (we include one) to adjust volume analog-style. Or hook it up to your favorite microcontroller and send I2C commands to set 64-steps of volume amplification.

Some great stats about the MAX9744:

Power from 4.5V-14V DC voltage
Up to 93% efficient (88-93% typical)
20mA quiescent current (or put into shutdown for 1uA quiescent)
Up to 29.5dB max gain
Use DC or AC coupled line-level input, up to 3Vpp
Filterless Spread-Spectrum Modulation Lowers
Radiated RF Emissions from Speaker Cables
20W Stereo Output (4Ω, VDD = 12V, THD+N = 10%)
Low 0.04% THD+N
Integrated Click-and-Pop Suppression
Short-Circuit and Thermal-Overload Protection

Adafruit took this lovely chip and wrapped it up into a breakout for you, with polarity-protection, jacks and terminal blocks, i2c level shifting, and a spot to solder in a volume pot.

If you're looking for speakers to suit this amplifier, look no further than these 20W, 4 Ohm speakers.

Each order comes with one MAX9744 breakout board with all surface-mount parts fully assembled and tested. They also include 3 x 2pin and 1 x 3pin terminal blocks, a 470uF power filter capacitor and 1KΩ trim pot. To use this board, a little soldering is required to attach the terminal blocks and other components, but its fairly easy and expect it should take less than 15 minutes. Check out Adafruit's detailed tutorial for assembly instructions and overall usage

Tech Specs

Dimensions (without 0.1" header or terminal blocks):

Length: 54mm / 2.1"
Width: 41mm / 1.6"
Height: 2mm / .08"
Weight: 11g

Datasheets, PCB files, Fritzing object and more in the tutorial!

This product is listed in:

Breakouts & Modules>Audio

Product Comments

Exact shipping can be calculated on the view cart page (no login required).

Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

$3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
$6+ for Standard Post (typically 6+ business days, tracked)
$10+ for Express Post (typically 2+ business days, tracked)
Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

$11+ for Pack and Track (3+ days, tracked)
$16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

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