Article
Noisy LEDs
Simple generation of complex sound effects
These days there are many types of intelligent LEDs available. These LEDs flash or change their color, slowly or quickly and with different color combinations. Those LEDs that gradually change from color to color (so-called rainbow LEDs) were found to be particularly suitable for an alternative application. They happen to produce incredibly complex sounds when they are connected as shown in this circuit.
Materials
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Bill of Materials
Weerstanden:
R1 = 100Ohm
R2,R3 = 10kOhm
P1 = 100kOhm
Capacitors
C1 = 22µF 16V
C2 = see text
Semiconductors
D1,D2,D3 = rainbow LED, preferably mixed types
Miscellaneous
1 ‘Elex’ type experimenter’s board
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