This project is fun and useful! You can use it to increase the volume of your headphones, speakers or you could even use it in coalition with an electric guitar. It will roughly take you around 2 hours to complete.

Step 1: Supplies

You will need:

Project box
JB07-1-1-1 chip
(2x) 220u electrolytic capacitor
(2x) 10u electrolytic capacitor
47 n ceramic capacitor
8 pin DIL socket
1k carbon film resistor
10k potentiometer
10R carbon film resistor
SPST Toggle switch
9v battery
9v battery clip
Circuit board

Tools:

Soldering iron
Heat shrink
Glue gun
Multimeter
Solder

You can buy all these parts in a pre-assembled kit or you can buy them all separately.

Step 2: Assemble the Circuit

Assemble the circuit in your desired way. I added a toggle switch and a potentiometer to control volume and power.

Step 3: Drilling Holes

You then need to drill two holes. I used a 6mm drill bit and a 4mm one. Then you need to bolt the toggle switch to the lid and hot glue the potentiometer in the hole.

Step 4: Audio Jacks

The next step is to add the audio jacks in the input and output sections. Solder them into the correct place.

Step 5: Final Adjustments

Using a file, make a small dent on either side where the wires leading out to the jacks will go. I then used a pen style engraver to write "in" or "out" on the appropriate end.