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The first momentary switch is connected to the power supply of the circuit. By pushing the cardboard-button, the inside alu foil is touching alu foil and closes the circuit, the current flows and the motors run. | |||
The second momentary switch works the same way, but is connected to a DPDT-relay. When metal is touching metal the polarity gets reversed which changes the direction of the attached motors. | |||
== Assignment 3: Morgenflöte== | |||
'''555 timers, photocells ,speakers ''' | |||
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