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ksp1234

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Posts posted by ksp1234

  3. capcitive touch sensor

    in Electronic Projects Design/Ideas

    Posted

    hey audioguru,
                            if the first transistor rectifies the mains supply and den charges the first capacitor den wat is the role that the three diodes have??? once our finger touches the sensor element the mains supply is capacitively coupled to the transistor q1 which i have understood perfectly well ... and den the capacitor c1 starts charging... as u said da the second transistor is also a emitter follower and hence it is used as a current amplifier... dat is connected to the third transistor which has two diodes connected to it... i would be grateful if u cud explain da operation after that

  4. capcitive touch sensor

    in Electronic Projects Design/Ideas

    Posted

    hey audioguru,
                            thanks alot for the explanation uve given. but then there's another thing thats been bothering me... how does the proximity of the object to the sensor trigger the relay??? what significance does da darlington have in this aspect? thanks alot for the trouble uve taken ... i really appreciate it. my knowledge in this is as u can see very low... i'd like to learn how exactly does each component make a diff...id be more dan grateful if u cud do this for me.
    tc
    hope to hear from u soon

  8. capcitive touch sensor

    in Electronic Projects Design/Ideas

    Posted

    hi audioguru,
                        thanks a million for the link u sent me altho it doesnt use capacitance as its main component, which is wat i require now . I totally forgot to mention the link and it is www.electronics-lab.com where i got the schematic but insufficient working... if i am not pesterin you could you please try and find out and tell me.ill be more than grateful.
    thanks alot again
    prasad

  10. capcitive touch sensor

    in Electronic Projects Design/Ideas

    Posted

    hello everyone,
                            i looked up this site for a project in my curriculum and came across the capacitive touch sensor, although i did get a clear schematic i need  sufficent explanation about the working of the circuit. i would be highly grateful if any one will be willing to help me this matter. i really need this...
    please help.
    thank you

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