NOTE: if you are thinking about building one of these, see my newest addition first based on the 'Little Gem' amplifier, using a few more parts. It sounds much better.
Step 1: Parts List / Wiring Diagram
Enclosure: I used an old surround sound speaker as my enclosure. You could make this unit into a box and use as a 'head' for speakers in mini-cabinets too.
9V Battery Clip
Input / Output Jacks 1/4 Mono
SPST Switch OR Dip Switch w/ 5 settings
PCB / Board material
8 Pin IC socket (optional)
[optional - for multiple distortion modes]
2.2 uF capacitor
+ higher cap values = heavier distortion
Step 2: Putting it together ...
I make a daughter board for my dip switch and extra capacitors for my multiple distortion modes.
I usually use shielded audio cable for the inputs and outputs to cut down on any feedback / buzz ; and a socket for the LM386 IC (not necessary) - just in case it gets toasted.
The LED for on/off is out the front [ use a 470ohm resistor between +9 and your on off switch ]
Battery location could be internal, but they get ate so I mounted mine externally. A 'Supercap' battery is another idea -- (DIY 9v rechargeable) or some other rechargeable battery as this device runs up to 15v.
Dip switch could be replaced with a 6-position selection switch / or other
Gain / Volume POTs could be added
Step 3: Finishing Up
I'll probably add these in the near future:
Volume / Tone Pots
A distortion unit clone on a foot switch (VOX tone bender clone)
Rechargeable Battery (of some kind) & built in charger / car charger
6-way tone selection switch