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One Inch Squared - Portable Headphone Amplifier

Portable headphone amplifier with built in LiPo battery charger.

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Portable headphone amplifier that runs on a single cell LiPo battery (3.7V) and features a LiPo battery charger on board.

I chose the Texas Instruments LM4881 audio amplifier because it requires a minimum number of external components and features digital volume control. The total cost of components for a single amplifier is $21.99 ($16.99 for components from Digikey + $5 for PCB from OSH Park)

  • 1 × LM4881 Audio ICs / Audio Amplifiers
  • 1 × ne555psr Clock and Timer ICs / Timer ICs
  • 1 × 180k resistor 0603
  • 1 × 150k resistor 0603
  • 1 × 1uF capacitor 0603 Electronic Components / Misc. Electronic Components

View all 25 components

  • Choosing an Amplifier IC

    ww • 12/20/2015 at 23:41 • 0 comments

    I've considered numerous amplifier IC's, but I settled with the Texas Instruments' LM4811. The IC's small footprint and low number of external components required made it the perfect candidate for a size restricted design. The LM4811 also featured digital volume control, which means I won't need to include a clunky potentiometre to provide volume control! However, TI suggests using a microcontroller to handle the digital volume control. Microcontrollers are expensive and need to be programmed, so I came up with an alternative, which I will explain in a later log.

    http://www.ti.com/lit/ds/symlink/lm4811.pdf

View project log

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Andrew wrote 11/24/2021 at 22:50 • point

I know this is an old project, but how far did you get? Can you share the Eagle Files? Thinking of doing my own around the LM4811. Thanks!

  Are you sure? yes | no

Blecky wrote 12/07/2015 at 01:34 • point

Just a friendly reminder to please upload your design documents by 23:59 UTC on Dec 8, 2015 to be in the running for #The Square Inch Project!

  Are you sure? yes | no

alpha_ninja wrote 12/02/2015 at 00:41 • point
This is your one-week reminder to upload design documents: https://hackaday.io/project/7813-the-square-inch-project/log/28566-design-deadline

  Are you sure? yes | no

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