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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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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. | 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]] | |||
Latest revision as of 17:28, 2 September 2015
Introduction to Electronics
Assignment 1: variable resistance and conductivity
material: 555 timer, capacator, resistor, LED, speaker and different conductive material
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.
<videoflash type="vimeo">134547338|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
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...
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>
