Simple Clap Switch.
Mostly Clap switch are very complex most clap switch use atleast one IC or atleast 7-8 transistors. So making clap switch for an unexperienced electronics hobbyist is allmost imposibble. But I am here to help you with the solution. The circuit given here contains just 3 transistors.
This circuit I made it is just of my thumb size.
Most probabely this is the simplest (using less components) clap switch in world.

This circuit needs a power supply of 6 volt. And can power a load of 6 v. But it itself uses only some mili watt of power.
The clap switch works in this way:
The output is off when there is no loud sound.
If you give a sudden loud sound like clap then the output is on for some time you can fix the time by changing the value (in farad) of the only electrolytic capacitor used in the circuit. If you use the default capacitor given in circuit the time will be about 10 seconds.
If there is a continious loud sound the output will be on till the loud sound is given.
The circuit diagram is here click on the image to enlarge it.
Please use the comment box below to send any question or suggestion about the circuit.

Thank you a lot for this great circuit diagram.
Nice info, keep on posting
Hiii and thank you for visiting my website
and shall i help you to build the website
If You wish
But accept hardware i can give Information about softwares
But Except hardware
@sankesh Thank you for your intrest in hel;ping me. I will surely talk to you if i need any help.
Thanks.
@mariejones
You are welcome.
Good!!
Simple!!
Good for my project
Thanks for your comment. And good luck for your project.
dude thanks for the diagram i think you can modify this and post it in magazine
@aravind
Thanks for your comment.
And ya we can post this in magazine.
But please don’t forget to give credit to my site justtechnika.com if you publish this in magizine.
need the working
this schematic are something wrong… a similar schematic is at “Link Deleted” and directly link for them is “Link Deleted”
@niq_ro
Thanks for telling me that.
And i checked their site.
As far as i can see they republish images and articles ,
and their article was published in December 2009 and i have published
this article before September.
Might be they copied my schematics.
But i learned about this circuit in my college from my teacher so may be they might have got it from some other source too.
it doesn’t matters to me.
They are also trying to give information to peoples and i too.
So no matter!
Thanx for this . Do you also have a diagram for a 220v house light switch? Thanx again…….
@Bokbok
Ya I have.
I will soon post a new article about that and update here.
he viyanor k ho supent circut banauni
lala k cha
Are this circuit really works??please reply me a.s.a.p..
Pleas mail the circuit diagram of clap switch.How can I understand the collector emitter and base of the transistor used in this circuit?explain the working of the clap switch.
@Edward
Well, this circuit works and I have tested it before posting it here.
@shinu.B
why should I mail the circuit diagram it just there! you can save the circuit diagram to your computer for your use.
And if you have electronics knowledge and can read circuit diagrams then you can see which one is the base/collector/ of the transistor.
please could u explain the clap switch circuit in detail as i have to write a report on this circuit
im designing a clap switch using pic16f690 to control lights what id like to know is,is it possible for me to use the amplified pulse as my input to pic without using another component to change the signal or something