Clap switch

Parts list :-
Resistors :-
                     R1                -   15k
                    R2,5,12        -    2m2
                    R3                 -    270k
                    R4                 -    3k3
                   R6,10            -    27k
                   R7,11            -    1k5
                   R8,9              -   10k
                   R13               -    2k2
Capacitors :-
                   C1      -   10kpf disc
                   C2,3   -  47kpf disc
                   C4      -   1000uF/16v

Semiconductors :-
                     C1,2,3,4     –   BC 149 B OR C
                      D1             -   IN 4002
                     D2,3,4,5    -  IN 4148

Misc :-
                    X1         -  12v/300mA  transformor
                   MIC       -  Condensor Mic
                   RLY        -  12V Single Charge o relay


    Here is circuit for electronics hobbyists that can switch on and off a light , a fan or a radio etc., by the sound of a clap.
The sound of clap is received by a small micro-phone that is shown biased by resistor r1 in the circuit . the singnal is futher am olified by transistors Q1 ,Q2,Q3. The relay contact is connected to the power line and hence turns on/off any electrical device connect at output socket

 

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