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Audio Power Amplifiers
25W Bipolar audio amplifier Current dumping audio amplifier

Speakers Design
DIY Subwoofer Speaker Box Volume Calculator

Microcontrollers
PIC programmer PIC16F84A test board Home security system with PIC16F877A O2, an USB based oscilloscope

Power Supply
1.5V - 25V/3A & 5V/1A Lab Power Supply DC-DC converter with TLE6389G50-1

Mechanical Design
Pro/ENGINEER sample design