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== Assignment 1: variable resistance and conductivity== | == Assignment 1: variable resistance and conductivity== | ||
''' | '''material:''' 555 timer, capacator, resistor, LED, speaker and different conductive material | ||
Current flows through the 555 timer | Current flows through the circuit, 555 timer in astable mode and the attached conductive material, which creates square wave oscillations that are output on a speaker. | ||
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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: | [[File:555 astable 2a.jpg]] | ||
== Assignment 2: switch== | == Assignment 2: momentary switch== | ||
'''555 timer, 2 switches, relay, 2 motors, trash''' | |||
<videoflash type="vimeo">136196422|400|265</videoflash> | |||
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: Final assignment/ Morgenflöte== | |||
'''555 timers, photocells, capactors, resistors, speaker, cardboard tubes''' | |||
The "Morgenflöte/morning pipe" is a light depended instrument, which is best played in the morning... | |||
[[File:Morgenfloete_summary_.jpg]] | |||
It uses 2 or more photocells implemented in the cardboard tubes attached to 2 or more 555 timers in astable mode on a "burning circuit"(it´s getting hot). | |||
<videoflash type="vimeo">134558655|400|265</videoflash> | |||
[[File:morgenfloete_circuit.jpg]] |
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