Step 6: Finished!
- A low battery indicator. I thought of this after I was nearly finished but a transistor and voltage divider could activate an LED when the battery drops below a particular voltage. Could definitely come in handy and would also help prevent over-draining the battery.
- A different battery technology. A lighter or more powerful battery technology would increase the battery life and weight quite a bit. They are, of course, more costly and require special charging circuit otherwise they pose a major fire hazard.
- Bigger more powerful amplifier. The TDA2003 design is scalable, so a more powerful amp circuit could be devised, but the battery life will take a hit unless upgraded as well. If someone wanted to build a large cabinet with a full car battery inside then a 100W amp may be required. High power amplifiers for car audio can be purchased as kits for relatively cheap on the internet.