To build a portable sound system, you will need:
  • 1 Adafruit Stereo Class-D Amplifier
  • 2 speakers (3 ohm minimum. 3" to 4" is a good size)
  • 1 3xAA Battery Pack
  • 1 Power Switch
  • 1 Phono Jack (We used a 1/4" here)
  • 1 50kOhm Stereo Audio-taper pot
  • 1 knob
  • Jumper wires
  • 1 Box (We used the case from a power tool. But any lunch-box sized enclosure will work as well)
  • 2 Speaker Grilles (We used some 4" fan grilles here)
  • Screws & nuts to mount the speakers.
  • Polyester batting or pillow stuffing

Mount The Speakers

Cut holes in the box to fit your speakers and mount them in the box with screws. Here we used 4" speakers with 4" fan grilles and mounted them with 3/4" 6-32 machine screws and nuts.

Mount the Controls

Drill holes to fit your power switch, volume pot and phono jack in a convenient location and mount the controls.

Here we used a 1/4" phono jack. Smaller plugs can be accomodated via adapters. Our volume pot has a Spinal-Tap compliant volume scale that "goes to eleven".

Wire it up!

Make all connections as shown on the diagram to the left. We used these pre-terminated jumper wires to simplify connections to the amplifier.

Mount the Amplifier

Some double-sided foam tape will hold it securely inside the box.

Add some stuffing

Loosely stuff the back of the box with some polyester batting or pillow stuffing for a less 'hollow' sound.

Plug And Play!

For an iPod or similar player, you will want to use the highest gain setting.

This guide was first published on Jan 27, 2013. It was last updated on Oct 28, 2014.

This page (Build a Portable Sound System) was last updated on Jan 15, 2013.

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