Introduction: Multipurpose Audio Amplifier

Interface your iPod/MP3 Player, PC, Portable Radio and lots of other devices to this Portable Audio Amplifier! Plugs right into the stereo headphone jack on your device.

The Multipurpose Audio Amplifier was designed by BrandonC. You can get the parts from Gadget Gangster. Here's the schematic. If you'd like to gather the parts yourself, you'll need the following.

Parts list

  • 1x20 ohm resistor
  • 5k potentiometer
  • 22Ga Hookup wire
  • Gadget Gangster project board (boss board)
  • .1 uF Cap
  • Jumper wire
  • 4xAA battery holder (and batteries)
  • 3.5mm Audio Connector
  • A nice 8ohm speaker
  • And an LM386 Audio Amplifier DIP

You'll also need a soldering iron, solder, and wire cutters. Build time is about 20 Minutes and is an easy build.

How to Use It

Usage is super-simple - just plug what you want to amplify into the 3.5mm stereo jack, and control the volume with the knob. Get started building - go the next page for step 1.

Step 1: Jumpers

Start with the jumpers;

Bare jumpers at:
D (N7:M7)
E (N9:M9)
M (G9:F9)
N (O28:O29)

Red jumpers at
H (F16:D16)
K (C14:C12)
L (F10:D10)

On the back of the board, use a bit of hookup wire to connect D11 to M8

Step 2: Everything Else

Take a bit of hookup wire, connect one end to one pad of the speaker, and connect the other end of the hookup wire to H10. Use a bit of hookup wire to connect the other pad of the speaker to F18.

Add the LM386 IC between 7and 8, J and K

Add the Capacitor (J10:J13)
Resistor from H13:E13

The potentiometer goes in the area marked [Pj]. the headphone jack goes at [Pk].

Lastly, take the battery box, connect the red wire to E6, the black wire to F8.

You're done! Enjoy the tunes!