PEDAL PARA GUITARRA DE EFECTOS TREMOLO CON LM386 Y LM555C

As far as tools go you will need:

1.) Soldering Iron

2.) Solder- Make sure that you have rosin core solder, acid core does not work on electronics.

3.) Multimeter (Optional, but very handy)
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Twenty dollars spent at your local Radioshack will get you all of the parts you need for the pedal:

1.) Resistors: 470ohms x 3 (Yellow-Violet-Brown)
4.7K x 1 (Yellow-Violet-Red)

2.) Potentiometers: 100K x 1 (the small type that solders onto the board)
1M x1 (the big type that you attach the knob to)

3.) Integrated Circuits: LM386 Audio Amplifier
555 Timer

4.) Transistors: PNP Transistor x 1

5.) Capacitors: 10uf Polarized x 2
.1uf Ceramic x 1
220uf Polarized x 1

6.) LEDs: Green LED x1
Red LED x2

7.) Connectors: Female Guitar Jack x 2
9v Battery Clip x 1

8.) PCB: Any standard perfboard should do, I used one about the size of a credit card that I bought at Radioshack.

Fuente: http://www.instructables.com/id/Make-Your-Own-Tremolo-Effects-Pedal/