The circuit design comes from runoffgroove.com and is a great beginner electronic project. The amp has few parts, is inexpensive, sounds great and has impressive power, considering it runs on a 9V battery. It will even power my 4 x 12" guitar cabinet! (Not at gig levels, but great for practice)
Step 1: Materials and Tools
Wood Jewelry Box
Rubber Feet (4)
Small Piece of burlap or speaker cloth
3" Speakers (2)
Scrap of 1/4" Wood
Paint Brush or Sponge
10 ohm resistor (1)
3.9K resistor (1)
1.5M resistor (1)
1K Linear Potentiometer (1)
10K Linear Potentiometer (1)
MPF102 or 2N5457 Transistor (1)
LM386 or JRC386 IC (1)
.047uF Film or Ceramic Capacitor (2)
.1uF Film or Ceramic Capacitor (1)
100uF Aluminum Electrolytic Capacitor (1)
220uF Aluminum Electrolytic Capacitor (1)
Stereo 1/4" Jack (1)
9v Snaps and Battery Holder (1)
Perf Board (1)
24 Gauge Stranded Wire (1)
Toggle Switch (1)
(Optional) LED and 1K Resistor (1)
Router with Trim Bit
Carving Tools (Rotary tools, CNC, knives, etc)
Step 2: Design
I took the measurements of the box to use as a template and drew the design in Adobe Illustrator. Here is a link to my vector design if you would like to use it for your own amp project, but please only use it for non-commercial purposes. Thanks!
Step 3: Wood Veneer Application
Fun Fact: Hide glue smells like death.
Let the glue dry over night, then trim the excess veneer using a router and trim bit.
Step 4: Filling and Sanding
Step 5: Design Application
Step 6: Wood Finish
Step 7: Hardware
Next attach the rubber feet. I chose to put them on the side with the hinges, because when the latch is open, the door stays partially ajar, giving the option of having either closed or open-backed cabinet.
Plan and mark the layout of the controls. When drilling, I like to use a bit of painters tape for cleaner holes in the wood.
Step 8: Electronics
I used their veroboard layout. I like to position the components with the wires through the board and bend the leads on the reverse side, so that they stay in place while soldering.
Another helpful resource if generalguitargadgets.com, they have an alternate circuit layout and a very helpful wiring diagram here:
Where to purchase parts
I always tend to buy parts locally if you can find them, here are a couple other suppliers that I have bought from:
Small Bear Electronics: Easy to navigate, fair prices and they have pre-assembled kits available
Mouser: Huge inventory with good prices, sometimes difficult to find what you need due to sheer quantity of products.
Futurlec: Easy to navigate, great bargains, but company is based overseas and could take around a month to arrive.