AMPLIFICADOR PORTATIL PARA GUITARRA CON LM386

Parts list:
B1 – 9 volt battery clip and battery
C1 – 4.7μF 16v capacitor
C2 – 100μF 16v capacitor
C3 – 470μF 16v capacitor
C4 – 10μF 16v capacitor
D1 – green diffused LED (just about any color/type will work)
J1 – ¼” (6.5mm) mono jack (guitar input)
J2 – 1⁄8″ (3.5mm) stereo headphone jack (headphone output)
R1 – 1kΩ ¼-watt resistor
R2 -10kΩ ½ watt potentiometer
SP1 – 8Ω ½ watt speaker (2¼” diameter, from an old PC)
SW1 – DPDT “on-off-on” mini toggle switch
U1 – LM386N-1 low voltage audio power amplifier IC

Misc. – breadboard and breadboarding jumper wires (for optional Step 3), hookup wire (small-gauge stranded), small perfboard, solder, knob for R2

Fuente: http://www.instructables.com/id/Make-a-Sweet-Portable-Guitar-Amp/