Assignment 1: electric resistance and conductivity
555 timer in astable mode with speaker and different conductive materials
<iframe src="https://player.vimeo.com/video/134547338" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
<a href="https://vimeo.com/134547338">conductivity 1</a> from <a href="https://vimeo.com/pratchel">pratchel</a> on <a href="https://vimeo.com">Vimeo</a>.
schematic for 555 timer in astable mode with speaker and different conductive materials
