Adafruit 1752 20W Stereo Amplifier Class D 4-8 Ohm Impedance MAX9744

Adafruit
Order Code:

75-0506

Brand: Adafruit MPN: 1752 EAN-13: 0700598871173

Discontinued


A 20W stereo Class D amplifier fully assembled and mounted on a breakout board. The amp can drive 2 channels into 4 to 8Ω impedance speakers at 20W each. 5 to 12V DC power to the amplifier is via an onboard DC power jack and there is a 3.5mm stereo jack for stereo line level. The Class D configuration means that the amplifier is completely cool-running, requiring no heat sinks or thermal management and also the amplifier works at around 93% efficiency, making it perfect for portable or battery powered applications.

The amplifier can be controlled by both analog and digital volume controls, using the supplied 1K pot for analog and by connecting to a microcontroller via I²C to get 64-steps of digital volume control. The breakout board features polarity-protection, jacks and terminal blocks, I²C level shifting, and a spot to solder in a volume pot and the kit comes with 3 x 2-pin and 1 x-3 pin terminal blocks, 470µF power filter capacitor and 1K trim pot.

Learning tips and tutorials can be seen at https://learn.adafruit.com.


  • Fully assembled
  • Power from 4.5 to 14V DC
  • 20mA quiescent current
  • Up to 29.5dB max gain
  • Use DC or AC coupled line-level input, up to 3Vpp
  • Filterless spread-spectrum modulation
  • Low 0.04% THD+N
  • Integrated click-and-pop suppression
  • Short-circuit and thermal-overload protection

*Customers looking to resell on eBay or Amazon should contact Adafruit directly.


Type Stereo amplifier

Questions


*Question functionality currently disabled


Saturday, February 2, 2019 Question by: Rapid Customer | Product code: 75-0506
Q. Do you d a mono version Single channel
A. Hi Colin, thank you for your question. Unfortunately this is not available as a single channel version.

Reviews


Fantastic bit of kit for TV's + Other uses.

Reviewed by: Mr Karl Pielorz - Friday, January 15, 2016
This amp replaced an entire stereo system sitting next to my TV. Using this (connected to the TV headphone socket), and with the speakers from the now retired stereo, I now still have much improved sound from the TV without the bulky stereo system - and can control the volume via the TV remote. If your lucky you can use USB power from the TV to run it (if not any 5-14v 'wall wart' type adapter will do). The PCB is compact - barely gets warm, and pulls far less current than the stereo used to on standby (there's no contest!). Sound quality is very good - no 'thump' on turn on (with my TV), and no hiss that I can hear when the TV is off. Probably has umpteen other uses - but improving the notoriously bad 'flat panel TV' sound quality is a great one. Mine's now suitably boxed and velcro'd to the back of the TV (it weighs almost nothing). The only downside I found is the speaker terminals supplied are a 'bit weedy' for the cable I was using - but I'd guess with 20W per channel they weren't expecting people to use too thick a gauge wire. Unit works even without the volume pot attached (and provides enough gain to be usable without it) - though fitting it is simple. Just remember to solder-join the correct pads on the board if you're using it in 'Analog' mode - but all explained online (there's heaps of stuff online for this board - including controlling it from a micro-controller etc.) 20W may not sound a lot (and you will need a 14v supply to achieve this) - but remember it's 20W with none of the 'PMPO' 'RMS' 'Total Music Power' rubbish - I'd imagine 20W is more than enough to annoy the neighbours - even with 8ohm speakers. I'm using off a 12v supply with 4ohm speakers and it's more than loud enough. Would definitely recommend!


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