Recently I have too little time to work on my ideas. That's why i decided to bring back some of my old projects to life. One of them is sine wave generator with adjustable frequancy based on AVR microcontroler. To generate a wave I use PWM output of microcontroler and low pass RLC filter. Generator works in frequancy range from 20 to 1000Hz. It has LCD mounted on it to show coresponding frequancy in Hz and note of the sound (like C,D,E,F,G...). Both frequency and volume are adjustable using two knobs. Below are some pictures and here is link to source codes.
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