555 toy light piano circuit

Published:2011/6/8 1:02:00 Author:nelly | Keyword: toy, light piano | From:SeekIC

As shown in the figure 11-24, the astable multivibrator is composed of IC(555) and R1, C1 and photosensitive resistance RG, the oscillation frequency f=1.44/(R1+2RG)C1. We can see, the oscillation frequency is related to RG, and RG changes in relation to the light intensity. If this circuit is put under the light, and the finger shakes back and forth, it will send out multi sounds.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/555_Circuit/555_toy_light_piano_circuit.html

Print this Page | Comments | Reading(3)