This is a simple 555 timer circuit using which we can generate music by just sketching using a pencil

<p>cant see anything :( too saad im too sad...</p>
<p>Very interesting! </p><p>Have you considered adding some steps with photos and written text to accompany your videos? Using that format will probably help your posts here get a little more attention. Just a thought! :)</p>

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More by khader sk:Scary Eyes in the Dark (switch controlled) LED voltage range indicator USB lights for keyboard 
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