Circuit:

Components:

· mic-1

· IC555-1

· 4027-1

· BC547-1

· 10k-2

· 100k-2

· 10uf-1

· .01uf-2

· LED-1330E-1

WORKING:

The MIC acts like a transducer. it converts sound into electrical signals. These signals are very low in amplitude. so we use a transistor BC547 to boost the signal hence creating a pulse sufficient to drive IC555 when someone claps. the IC555 is used in Monostable state. when a small pulse is generated when we clap, the IC555 triggers and creates a pulse of roughly 1 second. sufficient for the second stage. if C2 is not present in the kit, replace it with a wire. the output of the IC555 is fed to CD4027 which is a dual JK flip flop. when J=1 and K=1, it toggles for every clock. hence for every pulse created when we clap, the output the IC4027 toggles. hence this entire setup acts like a clap switch. for making it more sensitive, add another preamp circuit for the MIC.

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