• on Audio/Video/Photography
  • Published in issue 7/2012 on page 21
About the article

Noisy LEDs

Simple generation of complex sound effects

Noisy LEDs

These days there are many types of intelligent LEDs available. These LEDs flash or change their colour, slowly or quickly and with different colour combinations. Those LEDs that gradually change from colour to colour (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.

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Products

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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