Stereo 2 x 150mW Class AB LM4881 Headphone Amplifier Board

Brand:| Model: AA-AB32261
Step up the output of your smartphone to drive high impedance headphones with this Class AB headphone amplifier board. The LM4881 IC is used to provide up to 15.7 dB of high quality gain to power even the most power hungry headphones.
  • High quality Class AB output that uses the LM4881 Boomer IC
  • Up to 150 mW of power per channel (15.7 dB of gain)
  • Able to drive 8 ohm speakers
  • Operates on 8 to 24 VDC
Part # 
Weight: 0.1062 lbs.  
List Price$14.99
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Buy 10-up$7.84
Part # 320-321
Qty:  EA
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Product Details

Stereo 2 x 150mW Class AB LM4881 Headphone Amplifier Board

This compact, self-contained headphone amplifier board is built around the Texas Instruments designed LM4881 Boomer® dual headphone amplifier IC. The LM4881 features high quality, Class AB output (up to 15.7 dB of gain) with minimal components and is able to operate with a wide array of power supplies from 8 to 24 VDC without the need for a heat sink.

Additional to its use as a headphone amplifier, this amplifier board may also be used as a preamplifier or a small loudspeaker power amplifier, with output of up 150 mW per channel at 8 ohms. An exceptionally low total harmonic distortion and noise rating of 0.1% @ 150 mW into an 8 ohm load ensures clean output with lower impedance loads. Distortion and noise are even lower for high impedance headphone loads; 0.02% @ 75 mW into a 32 ohm load.

Locations for the addition of screw-down wire terminals are provided for signal inputs and power outputs. A two-conductor screw-down terminal is included for power supply connection. See related items for two-conductor screw terminals. Gain settings are provided for each channel, as-is stereo 3.5 mm input and output jacks, as well as a 2.1 x 5.5 mm DC power jack.

Features and Specifications:
• Input power requirements: 8 to 24 VDC, 500 mA (minimum recommended current capacity)
• Powre output: 150 mW @ 8 ohms (0.1% THD+N), 120 mW @ 16 ohms (0.025% THD+N), 75 mW @ 32 ohms (0.02% THD+N)
• Frequency response: 20 to 20,000 Hz (±3 dB)
• Gain settings: 9.6 dB (low), 15.7 dB (high)
• Input impedance: 1.7k ohm (with gain set to high), 3.3k ohm (with gain set to low)
• Thermal shutdown protection circuitry built-in
Dimensions: 3" L x 2" W x 5/8" H 

Stereo 2 x 150mW Class AB LM4881 Headphone Amplifier Board
  • BrandParts Express
  • ModelAA-AB32261
  • Part Number320-321
  • UPC848864012216
  • Product CategoryAudio Amplifier Boards & Modules
  • Unit of MeasureEA
  • Product Rating
    (3 Reviews)
  • Weight0.1062 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Stereo 2 x 150mW Class AB LM4881 Headphone Amplifier Board
Stereo 2 x 150mW Class AB LM4881 Headphone Amplifier Board is rated 4.25 out of 5 by 4.
Rated 5 out of 5 by from Great board for price!I am currently working on a potable boombox. I have a T-AMP TRIPATH TA2024 2X15W AUDIO DIGITAL AMPLIFIER BOARD that is hooked up to 2 FOUNTEK FE83 3" FULL RANGE DRIVER 8 OHM with a 12v 7ah SLA battery. It sounded great but i noticed with my phone it was a lot less quite than when i played from my laptop. So I figured i would give this part a try since it was so cheap. works fantastic boosted the volume so i can get full potential from the amp plus no distortion. i really like the ability to change the high pass filter as well. easy to wire and small enough to fit almost anywhere.
Date published: 2015-04-16
Rated 4 out of 5 by from Breathed new life into my Yamaha OrthodynamicsI bought this headphone amp in the hopes it would allow me to use my power hungry vintage Yamaha Orthodynamic headphones with my laptop (and other devices that lack the power to drive them properly.) I am pleasantly surprised with how well this tiny little amp works. Very clean noise free operation. I (somewhat crudely) constructed a little plastic box to contain the unit and the 1/4 TRS jack I connected to the amp. Using a 12v 1.5 amp power supply. Also considering adding 2 RCA jacks.This is exactly what I wanted and the price was unbeatable.
Date published: 2015-01-22
Rated 3 out of 5 by from I get full sound but also a hiss.I get full sound but also a background hiss. I've used 2 different iPods, (touch and classic) as well as my 'droid phone. I've played with gain settings on the amp board, the lowest setting works the best. I've also tried different power supplies but just cannot get rid of the background noise.
Date published: 2014-11-28
Rated 5 out of 5 by from Just what I neededI built a passive headphone crossfeed filter to simulate listening to speakers, but I needed to boost the output. This amp did the trick. It is well made and easy to hook up, and it sounds great with my headphones.
Date published: 2014-02-08
  • 2015-04-18T06:21CST
  • bvseo_cps, prod_bvrr, vn_cps_3.1.1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_4
  • loc_en_US, sid_320-321, PRD, sort_mostRecent
  • clientName_PartsExpressInternational

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
Stereo 2 x 150mW Class AB LM4881 Headphone Amplifier Board

is there a Wiring diagram for this board? also is this board for stereo output (left and right speaker) or is this mono output(either left or right but not both)? 

Asked by: dday
No, we currently do not have a wiring diagram and the board Is for stereo output.
Answered by: MattW
Date published: 2015-04-09

Is the Stereo 2 x 150mW Class AB LM4881 Headphone Amplifier Board a bare board or are the parts included?

Asked by: Toddr30
The LM4881 is an assembled amplifier board. The power supply is not included.
Answered by: TomI
Date published: 2015-03-04

Ok so, I'm new at this so bear with me. Besides the power supply, what else do I need to buy to start using this amplifier?

Asked by: Rodgl
Other than cables to connect from your music source and headphones, the power supply is really all you need to get this amp to function.
Answered by: MattP
Date published: 2015-03-04

Is the amp able to be bridged to get more power?

Asked by: ochocki
This amp is not bridgeable.
Answered by: MattP
Date published: 2015-03-04

Does this unit come with its own power supply?

Asked by: TheDavel
No these do not include power supplies. The adapter we recommend is below.http://www.parts-express.com/12-vdc-500ma-ac-adapter-with-6-ft-cord--120-1100
Answered by: MattP
Date published: 2015-03-04

There are 2 settings in the input, what are the settings? I cannot find a Spec. Sheet on this, not even on the SURE website.

Asked by: Reso
They're for gain-one for each channel. Pushing them upwards boosts the gain, and setting them down is for low gain.
Answered by: aricaudio
Date published: 2014-12-12
  • 2015-04-18T08:54CST
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