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  • This is the circuit of a very sensitive clap switch. It switches ON/OFF a White LED or electrical appliances through claps. The circuit can sense the sound of claps from a distance of 1-2 meters. Condenser Mic picks up sound vibrations caused by the clap.
    These sound vibrations are given to the inverting input (pin2) of IC1. It amplifies the sound collected by the Mic.

    Resistor R2, R3 and variable resistor VR1 adjust the sensitivity of the amplifier. Resistor R1 set the sensitivity of Mic. The amplified output pulses from IC1 passes to the input of IC2 (CD 4017). Resistor R4 keeps the input (pin14) of IC2 low so as to prevent false triggering.

    IC2 is a decade counter IC which is wired as a toggle switch. That its outputs 1 and 2 (pins 2 and 3) becomes high and low when the input pin14 receives pulses. Pin4 (output4) is connected to the reset pin15 so that further counting will be inhibited. The high output from IC2 passes through the current limiter R6 to the base of switching transistor T1. When T1 conducts, White LED (D2) turns on. If a 6V 100 ohms relay is connected to the points marked (A and B), the relay will also energize and the load (bulb or electrical equipments) will be switched on. In the next clap, output pin 2 becomes low and relay and White LED will be switched off. LED D1 (Red LED) indicates the OFF position.

    PCB Layout of Sensitive Clap Switch Circuit

    PCB Relay Pins
    2 + 5 – Relay coil
    1 – Common- Here connect the phase line
    3 – NO ( Normally Open) – Here connect the load phase in series to switch ON the load when relay turns on
    4 – NC ( Normally Connected) – Here connect the load phase in series to switch OFF the load when relay turns on

    In the PCB layout, points A and B are used to connect relay coil pins 2 and 5

    attentionThe author D Mohankumar is not an active member anymore. Please take into consideration that the presented information might not be correct.
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    209 Responses to "Sensitive Clap Switch Circuit"

    1. harsha vardhan says: on April 28, 2010 at 8:36 pm

      hello sir i am really sorry for asking u this question! Is this circuit working because I read in the blog that there is some problem with the IC2 please reply sir i am planing to this as my mini project
      thank you

    2. D Mohankumar D.Mohankumar says: on April 29, 2010 at 5:14 am

      The circuit is perfect. I am using the circuit and I have made some PCB for school students for their exhibition.It is working well. No problem with IC2.Some persons simply comments without constructing the circuits or asking the author about that.Ignore such unnecessary comments because they are always thinking negatively

    3. Arushit mudgal says: on July 2, 2010 at 8:46 pm

      sir it was perfect but there is a transistor clap switch also .Plz tell me how to make it


    5. hello sir id like to know will it be okay if i change the circuit a bit by using pic16f690 instead of using different ICs and if i use a triac instead of the relay used in your circuit. im doing this switch circuit as my design at school and i have to modify the circuit…pls help even if you suggest somethng else ill be very greatful.

    6. charith de silva says: on October 7, 2010 at 1:39 pm

      what ‘s the input places

    7. Its working…good

    8. what is the IC needed here? IC1 is 741? IC2 is CD4017? Can you also give alternative IC’s if ever they are not available. Thx. I’m planing to make this and include this in my project.

    9. D Mohankumar D.Mohankumar says: on November 19, 2010 at 2:12 pm

      IC 1 is uA 741. It is a low cost Op Amp readily available in all places. Alternately you can use any Op amp with same pin connections. Use CA 3130,CA3140,TL071 etc. which cost more.IC2 is CD4017 Johnson Decade counter which is also a low cost one and readily available IC.No alternate choice for it.If you use other counter ICs in toggle mode,it is necessary to modify the circuit.

      • sir will u pls tell me applications of sensitive clap switch

      • sir,
        will you please tell me the applications of sensitive clap switch?
        Am eagerly waiting for your reply.

      • dear priya,

        we can use these any where depending upon the application.

        ex: u can connect these circuit to ur bed room main light.
        when u on bed simply just clap goes to off. at the middle of nit if u want to go some where like for water or bathroom just u clap on ur bed then light goes turn on.

        u can connect any appliance depending on ur application and ur thoughts…k ru urderstand..

        if u want detailed clarification please call to my mobile 9032178141
        andhra pradesh kadapa…

    10. how can i make the mic more sensitive to clap? because after i made this circuit, it requires a great amount of noise from the clap to make the led switch on and off alternately. any idea how can i make the mic sensitive?

    11. the circuit is working :) thx thx thx

    12. which R1 do you mean D. Mohankumar? the 22k R1 or the VR1 1k??

    13. what’s a 47K preset? sorry for so many question. just a newbie here. thanks for the help sir. what do you mean by “preset”? is it a variable resistor?

    14. Im in the stages of purchasing the components but what is the unmarked LED with the words ‘IN 4007′ next to it?

    15. Thanks im new to this :)

    16. What would be the appropriate IN4007 attributes so that it will protect the tansistor?

      • D Mohankumar D.Mohankumar says: on December 5, 2010 at 4:44 am

        Diode IN4007 protects driver transistor T1 from back emf. If a relay is used in the collector of T1, back emf develops when the relay turns off. This will harm the transistor. So in all relay driver circuits, a diode is connected in the reverse bias mode to remove the back emf.
        Small variable resistors called presets are used to adjust the resistance. Its wiper can be adjusted from 0 resistance to full resistance value of the preset. For example, in 1K preset , resistance can be adjusted from 0 ohms to 1000 ohms.

      • is it really necessary if I am not using a relay?

      • Jim Keith Jim Keith says: on November 1, 2012 at 12:39 pm

        You are correct –diode is not necessary in your case :)

    17. sorry for all the questions and also what would be the suitable 1k variable reistor attributes?

    18. does the IC 741 work as a comparator?

    19. Hi,
      When the output 2 become high, does the output 3 become low when the input pin14 receive pulses?
      and in the next clap, when the 2 become low, how about output 3?

      • D Mohankumar D.Mohankumar says: on December 6, 2010 at 2:06 pm

        Outputs 1( pin 2 ) and 2 ( pin 3) becomes high and low in each clap since IC is wired as a toggle switch by shorting the output 3 with the reset pin 15.

    20. how can i use this clap switch so that i’ll be able to switch from points A to B to C then back to A again? where should i connect

    21. hey, i just wanna ask what relay is to be used at A and B? because while i’m simuating the ckt, it seems that the ideal relay in the workbench is discharging very slow. what should i do so that it would be faster? thanks

    22. how to connect mic in the circuit?please reply us….because we are new to this field……

      • how to connect? connect the POSITIVE of the mic to the NEGATIVE terminal of the OP AMP and the NEGATIVE of the mic to the ground. it’s that simple. I’ve done this last week for my Christmas project and it works just fine.

      PLEASE REPLY…………….

      PLEASE REPLY…………….

      PLEASE REPLY…………….

      PLEASE REPLY…………….

      PLEASE REPLY…………….

      PLEASE REPLY…………….

      PLEASE REPLY…………….

      • how to connect? connect the POSITIVE of the mic to the NEGATIVE terminal of the OP AMP and the NEGATIVE of the mic to the ground. it’s that simple. I’ve done this last week for my Christmas project and it works just fine.

      • D Mohankumar D.Mohankumar says: on January 11, 2011 at 3:37 pm

        Dear Sanket
        The MIC used in the circuit is the small condenser mic like the one used in tape recorders. Its lower side has two soldering points. The free point is + while the point in connection with the metal body is -ve. Connect this – ve point to ground and + point to Op Amp input.

      • sir can u send me the circuit fig.
        i.e emitter follower series voltage regulator using D882 npn transistor for 6v,4.5AH batter charging purpose……….

    24. sir..can i use a phone microphone..ii hav a landline spare..

    25. thanx sir..i m using one from a tape recorder but still have to clap very nearer to the mic..so sir plz suggest me the sensitivity measures for both presets(47k &1k) so that i can make the circuit working from more than metre..thanx anyways for a wonderful project..

    26. Hi there, I was just wondering if anyone had a stripboard layout that they had working?? If so is there any chance of posting it or emailing it to me. Any feedback would be great

    27. vibha pant says: on February 21, 2011 at 6:42 am

      please please please…pleaseee send me the details sooon…its realllyy urgent!!!

    28. I was wondering if it was possible to use an electret mic as i can’t get hold of any condensor mics?

    29. neeharika says: on March 18, 2011 at 4:38 pm

      can u plz tell me how 2 connect a relay?while drawing the layout we have take 5pin relay but in yours layout there are only 2 hole for relay(a & b). so how 2 connect the relay?????

    30. I am extremeeely interested in making this project and I have actually started using IC 555 but this looks very simple to me. Can you pleaseeeeeeee send me the details soonn. Its really urgent.
      Thank you

    31. I am extremeeely interested in making this project and I have actually started using IC 555 but this looks very simple to me. Can you pleaseeeeeeee send me the internal details and everything related to this circuit soonn. I really need it within a week.
      Thank you

    32. abdullah says: on April 28, 2011 at 6:37 pm

      What i’ve to do, to run a pspice simulation of this circuit? I cannot find the VDD and VSS pin in the spice model of CD4017(in my case CD4017B). What will be the model for relay used in the circuit? Is the relay is a must to turn on the white LED? Please, provide me with the answer.

    33. Student says: on May 11, 2011 at 4:04 pm

      I have built the cuicuit, but I have a problem with the circuit switching back to the off state after turing on, What could be the reason for this?

    34. kingallalive@yahoo.com says: on May 15, 2011 at 3:25 pm

      am doing this as my final year project,pls sir how can we minimize other sound from activating the switch.

    35. Ankush Thakur says: on July 25, 2011 at 11:40 am

      I m working on this project. It works well But I dn’t know the reason as i switched on the white Led Got shot…
      So a consequence is it indiactes red lyt but while working no white light….
      As it Switches well-ly on clap…

    36. Hello,
      Can u pls suggest a circuit diagram suitable for 30 leds clap switch mains operated. 230v 50Hz


    37. M.Vinay Varma says: on August 9, 2011 at 12:03 pm

      Can i get a clap switch circuit working with a input of 230v and also gives an output of 230v……..

    38. mike mwei says: on August 13, 2011 at 1:33 pm

      is it sensitive to any other sound other than a clap

    39. electron says: on August 19, 2011 at 3:43 pm

      sir this pcb layout is very confusing….plz help a little bit…………..:)

    40. electron says: on August 19, 2011 at 3:45 pm

      plzz tell me what to locate where on pcb

    41. electron says: on August 19, 2011 at 3:51 pm

      plzzzzz help

    42. electron says: on August 21, 2011 at 9:52 am

      Which software do you used to make schematics and PCB

    43. Midhun t says: on August 25, 2011 at 7:22 pm

      I am new to this site , i need ur help…..

      I bought a hobbyckt of clap switch and i got a relay switch i would like to know how to connect it, please help me…???

    44. Hi sir. Just wanna know what kind of mic I will use. I am using this schematic, but unfortunately it’s not working. Which I think, the problem would be the type of mic I am using.

      Thank you for your kindness.

    45. Hello sir, can you give us an explanation about the functions of points (A & B)?.

      Thanks a lot.

    46. Hello sir, can you explain about the function of points A & B? Where does it is connected?

      Thanks a lot.

    47. where i should connect the ‘phase comm’ into…? i really confused…!

    48. :):):) Thank you so much sir. It really works. :):):)

    49. Vaibhav Kaushik says: on October 16, 2011 at 12:27 pm

      i want to light 4 LED’s instead of 2,, how can i do that?

    50. thank you sir , i will try to make this soon and post here for help if needed

    51. sir,what is the cost of the circuit?????

    52. hello, I was wondering how much ampers does this circuit need to operate, I was thinking to use your “TransformerLess Power Supply 12V 100mA” as a power supply for this circuit. Can that board apply enoughe amps for this clap switch to work fine, and one more thing, what should I change in “TransformerLess Power Supply 12V 100mA” to get 9V instead of 12v?
      thank you :)

    53. D mohan kumar sir, This is karthik from kadapa in andhra pradesh. Im digital electronic circuits function designer. im designed the water overflow controller with fully automatic and semi automatic. which is around 500/- only.and working perfectly in realtime application.

    54. Hallo sir,i constructed it,but it works only when we claps with high level,that i feels low sensivity…….i repetaedly changed the microphone,but nothing with results…..pls rply me sir

      • hello in this circuit a minor problem is there. Problem in the sense pin connections of IC 4017. please follow my instructions.
        take the output from pins 2,7,1,6,11 are connect to each other with diode each. i.e

        pin 14 as input

        connect ground to 13,8,15
        connect power supply to 16

        In the mic section is better to desgin a circuit with 2 transistor for amplification rather than
        op amp.

    55. Respected sir plz can u make this diagram more simple and connections without using PCB board or any breadboard…
      or plz can you suggest me any other innovative idea for class 11th exhibition or any other website link or related information…
      Waiting for a reply and ur help..

    56. vijay narsale says: on November 27, 2011 at 12:53 pm

      sir pls send me tv audio video transmitter cricuit

    57. machuda

    58. suraj raj says: on December 1, 2011 at 6:33 pm

      can we how to deactivate a sound activated switch.and what will be the range of a magnetic coil type proximity
      sensor with the core diameter of 15cm?

    59. suraj raj says: on December 1, 2011 at 6:36 pm

      design detail for mc2830!

    60. abidvkvava says: on December 5, 2011 at 8:55 am

      sir i hav a dout.cay i stay on eighther LED’S ON./OFF State countinously! Pls rply!!

    61. Jeppe Clausen says: on December 17, 2011 at 10:46 pm

      I made this work, but with a few modifications..

      DO NOT put pin12 on IC2 to ground!

      And put a oneshot in between IC1 and IC2, i built mine like this:


      Where the “red” wire dosnt go from “ground to B” but from “pin6 on IC1 to B”

      hope it helps!

      • Thanx for your reply
        I am doing the project “DESIGN OF SOUND OPERATED HOME APPLIANCES(bulb and fan)”, the bulb should respond to the frequency above 1.5KHZ and fan respond to the frequency below 800HZ. I have already design the amplifier and HIGH and LOW PASS FILTERS. My problem comes on how to perform the switching (toggle),the bulb/fan should turn ON if it receives the signal(when it was OFF) and TURN OFF(When it was ON). PLEASE i need your help.

    62. HEy guys,

      I’ve made a clap switch for my science exhibition.Its an awesome exhibit.Try it out guys

    63. Hello guys,
      Since the sound is a continuous signal how will the IC2 encounter the signal to produce a single shot signal to avoid flashing?

      • Jeppe Clausen says: on January 4, 2012 at 12:12 am

        It dosnt, read my newest post..

      • sound signal is nothing but positive cycle.

        no sound means zero cycle.
        Please look the square wave signal.
        it looks like


        this is the signal

        The Ic2 count in +ve cycle only. The next count takes after the both +ve and _ve cycle only. when give sound again i.e +ve cycle start Ic2 gets count.

      • sor can i get your email so that i can send you my project(on proteus) cause i need help to finish my project just on the switching side

    64. sree kumar says: on January 10, 2012 at 7:36 pm

      is there any means to adjust t sensitivity of sound sensor in sensitive clap circuit,so that it could be used for sound analysis of motor,i.e. differentiate between good and bad motor…

    65. Dipayan Das says: on January 16, 2012 at 6:54 pm

      Currently i dont have IC 741, so can u plz tell that whether IC LM386 will work or not ???

    66. how to use the 6v relay

    67. hello guys i am using proteus simulution and i can’t find the microphone so please can i have any other best alternative for the simulation.

    68. frankenstain says: on February 1, 2012 at 7:04 am

      hi, i just wanna know if this application can be used for turn on/off 240v application. i’m gonna use 240v swithing relay and the signal will be produced by this circuit. is it sufficient enough? pls assist. thanz

    69. hello guys i’m getting confused, from what i know sound is a time varying signal so if some one gives sound will generate continuos pulses expecting the JK flip flop to toggle more than once(cause flashing) so how does the JK manage to keep its output constant until the next sound(pulse) is given,plz, and if there is any link where i can read more i will appreciate it

      • This IC 4017 is nothing buta DECADE counter…

        please understand one complete cycle contains (+ve cycle) + (-ve cycle)= 1 complete cycle.

        here u can give a just one clap means just +ve cycle.

        the function of decade counter is it counts in binary for every +ve cycle only. not at all change in -ve cycle.

    70. The circuit is perfect. I am using the circuit and I have made some PCB for school students for their exhibition.It is working well. No problem with IC2.Some persons simply comments without constructing the circuits or asking the author about that.Ignore such unnecessary comments because they are always thinking negatively

    71. Sarabjot says: on March 2, 2012 at 6:09 am

      hello sir
      this circuit works well … but when i connect relay then when i clap then relay energize but again it deenergize if i am not clapping whats reason??

    72. if i put more led in the circuit. how can i use the clap circuit to dictate how many led will turn on.

    73. Nitish Agarwal says: on March 17, 2012 at 8:14 am

      sir, i have completed the circuit. The only problem is with the relay.
      can you please tell me how to connect the relay? (it has 5 pins..and which pin to connect where)
      sir, also can you please send the procedure for making the pcb of this circuit using diptrace…

      • karthik says: on March 18, 2012 at 2:14 am

        Thank u for calling.

        If u used sugar cube relay.

        Relay is like that

        ——->@ @
        A.C Phase @–/

        ——->@ @ output

        those arrow points are power supply for input from driver circuit.

        1st middle point is one of the A.C contact.

        2nd 2 pins are switching
        one pin is normaly closed switch
        next pin is normaly opend (it will be closed when we give the power supply to the relay.

    74. karthik says: on March 18, 2012 at 2:16 am

      hank u for calling.

      If u used sugar cube relay.

      Relay is like that

      ——->@ @
      A.C Phase @—–/

      ——->@ @ output

      those arrow points are power supply for input from driver circuit.

      1st middle point is one of the A.C contact.

      2nd 2 pins are switching
      one pin is normaly closed switch
      next pin is normaly opend (it will be closed when we give the power supply to the relay.

    75. karthik says: on March 18, 2012 at 2:17 am

      @ @
      @ —-/

      @ @

    76. karthik says: on March 18, 2012 at 2:18 am



      ignore dots here @= points of relay

    77. plz can u give me an alternative for the 4017 ic.because its unavailable here
      plz reply need it urgently!

    78. Frank Agbota says: on March 27, 2012 at 11:51 pm

      psl help i have complete the circuit but not detecting a clap please help me

    79. Dear sir,
      I have question about relay..
      i am having a jqc t73 12vdc Relay

      i hace connected the ckt output to the coil terminals…

      now there are 3 terminals left – Nc,No,C

      Now out of these three..
      1.which one will go to mains(live/neutral)

      2.which will go to bulb(load)

      3.what about the third pin…

      PLZ help….

      • Jeppe Clausen says: on April 1, 2012 at 4:54 pm

        Take “Live” or your phase from the power source to C (Common) on your relay

        Take NO (normally open) to your lamp

        Take neutral from your power source directly to your lamps neutral, this should not go through the relay..

      • Thanks for your info…
        It means that NC terminal is left as it is..?
        Am i Right..?

      • Jeppe Clausen says: on April 1, 2012 at 7:10 pm

        Yea, you dont need it in this situation, it means “normally closed” and its allways the opposite state of “NO”

      • Thanks man…..

    80. how to make it more sensitive ?
      so that i do not need to clap too loudly.
      is there a way this can be done without buying a better mic?

    81. tehreem says: on June 28, 2012 at 6:24 pm

      hello sir!!
      sir we r making this project.and it is not working!!what we can do???our white LED is glowing without clapping……n red LED is not giving any response!!!plz help me!!wats the prblm??
      n also tell that hw to connect reley b/w A and B terminals???
      we r using RAS 1215 relay …..kindly tell hw to make connections?
      sir plz reply soon we have 2 submit our projct b4 10 july 2012.

    82. Alexandre says: on July 3, 2012 at 7:11 pm

      The circuit is working fine, very sensitive and precise. Thanks for sharing.

    83. thnks sir for your useful data
      plz sir give a some sugetion for make this same switch for 250v dc

    84. sir, we are using 220v supply for our appliances. my question is where do i connect those appliances in clap switch circuit. hoping for reply

    85. Jim Keith Jim Keith says: on August 9, 2012 at 5:25 am

      Your appliances are controlled by the normally open relay contacts (COMM to NO) –the coil of the relay connects to points A and B. Evidently, the relay is a panel-mounted type–note that relays that switch 220VAC are not easily compatible with circuit boards.

    86. kaushik bhanushali says: on August 19, 2012 at 9:51 am

      Deae sir,
      I wish to make this project but i can not understand the concept of relay kindly explain it. and also explain how to connect relay and how to connect bulb or load at the end.

      thank you in advance.

    87. This =is=very%easy%kindly connect the relay two terminal coil to A/B ..of the circuit..so connect (NC) with your appliance e.g bulb to mains N=(neutral) ..(NO) directly to mains L=(life) share%ur {testimony}

    88. Hello sir…, its jai.. sir m dng eng. frm ec branch nd nw m in 2nd yr.. sir coz of u i implement many ckt.. so i realy wnt to thank u frm my hrt… sir i wnt ur cel number ,if u dnt have any prblm …

    89. ROHIT CHHETRI says: on October 3, 2012 at 6:17 am

      i am pleased to visit this page…….i hope i’ll gain many more …….thanks and all the best sir.

    90. joemar batac says: on November 8, 2012 at 7:52 am

      sir why this proj. is already on if i will put suply on it… why its not closed???
      its that because of the ic 4017 cofigutration..????

    91. What is the us the use of the resistors in series with the LEDs am doing this as my final year project,pls sir how can we minimize other sound from activating the switch.

      • You should know this then.. The resister is deviding the voltage among itself and the LED, so the LED get the optimal voltage across itself..

        You can adjust the sesitivity by turning the adjustable resistor..

    92. kimbwereza says: on November 12, 2012 at 12:14 am

      D.Mohankumar,i can’t find where this sensitive clap switch is going to be used? plz could you explain that to me.

    93. John Alcedo John Alcedo says: on March 4, 2013 at 5:05 pm

      Sir, can I change the 6V 100 ohm relay to 12V 200 ohm?

    94. @D.Mohankumar, Hi Sir I’m Rabie…I’m just new heare and I tried to put it up on a breadboard but the white LED is just blinking…..and it doesn’t turn on the red LED everytime I clap…what’s the problem? Is there a specific microphone to use in this project? Can you answer me pls…ASAP I really need to have this circuit worked on and have some revisions to it…I’m going to use it for my project proposal in school….pls…. :)

      • Measure the DC voltage across the microphone. Then adjust the pot for the same voltage at the other input to the op amp–to reduce sensitivity, set either a little higher or lower in voltage–whatever works best. If there is insufficient range on the pot, change voltage divider values to bring the voltage into range.

      • There’s another problem sir…. when ever I turn the pot to the right side the red LED turns on…and if I do it again the other white LED turns on and the red LED turns off? Yet still it doesn’t turn on if I clap…? What’s its problem?

    95. shashank says: on March 8, 2013 at 6:59 am

      sir can u give me the details of the mic used>??

    96. Vijith aredath says: on March 9, 2013 at 4:19 pm

      what is the use op-amp(ic1)?

    97. how meny devices we can connect to this circuit

    98. I made touch sensetive switch which is very useful to any pupil and I also made a disco lights.

    99. Murtuza Adenwala says: on August 16, 2013 at 5:47 pm

      Sir can I use this type of circuit with AC mains in house. If yes, Please let me know the modifications of components.

    100. prashant says: on August 24, 2013 at 4:03 pm

      is it necessary to connect the relay in this circuit

      plz reply sir

    101. Thanks sir, it really helped us( me and my friends) in our Project..

    102. Sir would you please describe what is relay, we get an full package of relay, or we have to make it on our own based on the circuit diagram.

    103. my circuit is working but its not very sensitive my hands are badly damage..how can i increase the sensitivity

    104. Sir,
      i want the source code for clap counter using 8051 microcontroller.please.please

    105. sir how can i use relay(6v) in it..
      please rply

    106. sir how can i use relay(6v) in this circuit.
      please rply.

    107. Aman Singhal says: on October 27, 2013 at 8:40 pm

      Guys DOES this circuit really work Because mine does not

    108. Aman Singhal says: on October 27, 2013 at 8:41 pm

      sir please give the reply

    109. Aman Singhal says: on October 27, 2013 at 8:43 pm

      sir please give the reply fast

    110. Aman Singhal says: on October 28, 2013 at 1:17 pm

      I have checked everything twice if it is possible then please send the layout of it

    111. Aman Singhal says: on October 28, 2013 at 5:21 pm

      can i use a 5 k preset instead of 1 k

    112. sir only read led on .and other no change on clap .sir plz can u help me in my project .

    113. your project is very nice..admin,can u show me how to connect the relay plis..im still learning

      • hello sir..can u send me full circuit layout with the relay connection..im still learning..needed advice from expect like u..pliss sir

    114. Hi I would like to check what is the use of the relay parallel to the led?

    115. gaurav pathak says: on April 9, 2014 at 5:05 pm

      sir plz give me circut background wire connection picture or image & front pic also…………..
      its an urgent for my project
      sir plz help me


      • Harishvar says: on March 4, 2015 at 12:55 pm

        sir can you elaborate….plzzz???? where should i hook up 390 ohm in circuit without variable resistor??????

    117. can I use a 12v transformer to energized d load

    118. Tenx sir…,
      but mere circuit me first clap se red LED off hoke wight LED on hoti he par second clap se wight LED off nahi ho rahi he sir…..
      pls.. halp me…..

    119. initially the red is on,but there is no change even after clapping,please help us sir asap..

    120. Dear, sir how I can choose pcb to prepare this sensitive clap switch circuit

    121. What is the best simulation program? I use Multisim but it hadn’t the CD4018 also many components aren’t there in the program.

      Notice that:
      Multism power pro v13.0.1 – with 2014 updates.

    122. Sam Lumbergooz says: on January 3, 2015 at 7:17 pm

      One clap can happen unintentionally. To solve this problem, we can develop this 4017 counter to works as a 2-clap switch; this would make it more practical.

    123. Thanks for the circuit by God grace i will try it.

    124. Harishvar says: on March 3, 2015 at 6:16 pm

      How can i increase the senstivity of the electret mic…it’s sensitivity is tool low…..to increase should i decrease or increase the value of resistors….????????plzz replyy…..

    125. Harishvar says: on March 3, 2015 at 6:22 pm

      Guys….it is working superb…but the only problem is the sensitivity of the mic……and relay should be connected as shown in the picture…the plugging is the socket for the appliance….

    126. HArishvar says: on March 26, 2015 at 10:25 am

      sir please tell how to wire the potentiometer my clap switch is not at all responding

    127. Sheikh Hassam says: on April 1, 2015 at 10:25 am

      this circuit picks up sound from 1-2 meters range,please help me how can i increase its sensitivity? i am working on my university project and whose circuit which activates on faintest sound will be winner.
      project specifications are use 741 with any other components and circuit should be operated from 9v battery.
      DMohankumar and Jim Keith please send me circuit diagram i will be very thankfull to you thanks.

      • Jim Keith Jim Keith says: on April 1, 2015 at 1:50 pm

        Check out this circuit:

        Will try a circuit with a 741 op amp –similar performance should be expected

      • Jim Keith Jim Keith says: on April 1, 2015 at 3:43 pm

        What are the specs on the sound? frequency? duration? click? fixed location? how is sound amplitude varied?
        If these are specified, sensitivity may be greatly increased –along with ambient noise rejection.

        Also consider use of highly directional shotgun microphone–this could potentially increase sensitivity by 20db–but sound must be at a distance and have fixed location.

        Output could be a single LED.

    128. sheikh hassam says: on April 1, 2015 at 5:32 pm

      Thanks sir….there is no restrictions on sound specifications just faintest sound clap activator will be winner…. And as you say in second last step about circuit,please send me proper diagram because i am a beginner.thanks

    129. sheikh hassam says: on April 1, 2015 at 10:06 pm

      What is momentary flash ?

    130. sheikh hassam says: on April 2, 2015 at 5:13 am

      Stay on ……. No matter it deactivates on other clap…. Just stay on one clap

      • syd subboh says: on April 5, 2015 at 2:45 am

        Sheikh Hassam would u please send me your design may be I can make some modifications in it.

    131. syd subboh says: on April 5, 2015 at 2:40 am

      @jim keith I want little help. Actually I have some ideas to increase the sensitivity of the above circuit would you please help me in verifying my approach. Please send me your e-mail address.

    132. Thank you, the circuit definitely works!

      My one works kind of unstable – the clap can turn it state properly, but often it produces just momentary blink (so the state changes twice?) of one of the LED.

      First of all I thought that it’s positive feedback from Relay that I’ve connected to the output, because relay produces sound (I was able to even adjust sensitivity in a way to make it work in endless turn on-turn off cycle). But I’ve got rid of relay and the things do not changed much. Still sometimes it does not go to the next state, but one LED just blinks for a moment.

      Can it be somehow managed or it’s downside of this simple circuit?

      Attaching image and link to the video that shows caveat: https://youtu.be/fR6ExULQfQY


      • i wonder in this tutorial. The relay is conected 2,5 pins so how about 1,3,5??

      • Did you mean 1,3,4? If so, then 1,3,4 it’s your two outputs: the first one 1-3 and second one 1-4. Then one output is connected another one disconnected.

      • No I mean i see in this schematic. The 13 and 15 relay pins aren’t conected. Just 2 and 5 to A and B point.

    133. plz tell me the connection of relay .which terminal is to be connected in point marked AB AND WHICH TO BE LEAVE as it is?

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