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Rajkumar Sharma has shared his 12W Audio Amplifier project on Electronics-Lab. It is a low frequency class AB audio amplifier built around TDA2006, which provides 12W output to a 4Ω load at ±12V power supply.
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This Cassette Tape MP3 player is built by embedding an inexpensive USB MP3 player inside an audio cassette. Miniature switches are implemented to use the cassette tape wheels as control switches for selecting the songs and adjusting the volume.
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This project describes a transistor-based DIY FM transmitter with a range of 1/4 mile and adjustable transmitting frequency from 87-108 MHz. The author has also posted the PCB layout and the schematics of this project.
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In this instructable, a 15 year old kid Angelo describes a homebrew USB condenser microphone for recording quality audio at home. His project uses an USB soundcard (DAC), a transistor preamp circuit, and two microphones, all enclosed inside an Altoids tin box. The resulting setup has cardioid pickup pattern, smooth frequency response and 16-bit output, and 44.1/48kHz resolution, which gives you professional audio results under the budget of $10.
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Current sensing is a fundamental requirement in many electronics applications. Linear Technology has this application note on collection of current sensing circuits that have been compiled from different other documents.
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