Miscellaneous power sources and cables used in many of the projects.

Audio

• Altoids headphone amp ($10)
• GTDT desktop amp ($10)
• Desktop speakers ($100 or $140)
• 3122 Class-D amp ($15)
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• Sub-woofer
• Sub-woofer amp
• 2.1 amp
• Distortion amp (guitar-effect amp)
• Color organ

Arduino

• Cyduino ($15)
• Resist-o-meter ($10)
• Battery Checker ($10)
• Temp-Time platform ($15)
• ATmege328 programming shield ($5)
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• Cap-o-meter
• ATtiny programmer

Other

• Small DC supply
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• Surface-mount projects
• Design a PCB