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== Introduction to Electronics == | == Introduction to Electronics == | ||
== Assignment 1: | == Assignment 1: variable resistance and conductivity== | ||
'''555 timer in astable mode''' with speaker and different conductive materials | '''555 timer in astable mode''' with speaker and different conductive materials | ||
Current flows through the 555 timer circuit and the attached conductive material, which creates square wave oscillations that are output on a speaker. | |||
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<videoflash type="vimeo">134555309|400|265</videoflash> | <videoflash type="vimeo">134555309|400|265</videoflash> | ||
By changing conductive material(water, metal..), you change the resistance and the pitch of the tone. | |||
schematic for 555 timer in astable mode with speaker and different conductive materials | schematic for 555 timer in astable mode with speaker and different conductive materials | ||
[[File:555_astable_2_small.jpg]] | [[File:555_astable_2_small.jpg]] | ||
== Assignment 2: switch== |