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The biggest challenge of Variable Resistance was to find materials that are flexible in terms of the current flowing though them. | The biggest challenge of Variable Resistance was to find materials that are flexible in terms of the current flowing though them. <br> | ||
We tested things by including them into the circuit of a 555 timers astable mode. | We tested things by including them into the circuit of a 555 timers astable mode.<br> | ||
After trying out things that I carried to the classroom I had the idea to connect something to the circuit that was already there.<br> | After trying out things that I carried to the classroom I had the idea to connect something to the circuit that was already there.<br> | ||
The chalk board was a good example: by connecting a humid rag (to pin 6) and a piece of wet aluminium foil sticking to the board (to pin 7) I could draw sounds by wiping the surface.<br> | |||
Thereby I found out that it is very important to „calibrate“ the used material: a very high and still hearable tone should sound when the rag is put directly onto the aluminium connector.<br> | Thereby I found out that it is very important to „calibrate“ the used material: a very high and still hearable tone should sound when the rag is put directly onto the aluminium connector.<br> | ||