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The first assignment was to build a fancy variable electronic resistor. I built a table-sized piano made of a wet cardboard. The resistance increases with the distance between the cable connection. The internal structure of the cardboard affect on the current | The first assignment was to build a fancy variable electronic resistor. I built a table-sized piano made of a wet cardboard. The resistance increases with the distance between the cable connection. The internal structure of the cardboard affect on the current | ||
[[Image:Wetcardpiano.jpg]] | [[Image:Wetcardpiano.jpg]] | ||
The current flows through a basic 555 timer circuit - creating square wave oscillations which can be played on a speaker. By changing the distance between the connection on the cardboard you can change the resistance and the pitch of the tone. | |||