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prateeksikka

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Posts posted by prateeksikka

  3. TELEVISION

    in Electronics chit chat

    Posted

    hi shahriar and audioguru!
    can i generalize the statement that all AC CIRCUITS are dangerous because the voltage across the connected components can be even higher than the supply as according to kirchoffs law the nrt voltage is the phasor sum of voltages across the components.for e.g in an RLC circuit i have a net supply of 400V ac(assumed)
    across R--------400V
    across L---------1000V
    ACROSS C------- -1000V
    HENCE NET 400V AM I GOING IN THE RIGHT DIRECTION????

  4. COLOUR T.V

    in Projects Q/A

    Posted

    hi all!
    does it have to do with very high voltage inside it?
    i know that i have to be careful when i open up a TV rather in all AC circuits where netvoltage is not the algebraic sum but phasor sum of the drops across the components.
    any comments?
    prateek

  5. FM WAVE PROPAGATION

    in Electronics chit chat

    Posted

    hi audioguru!
    sorry for it but i could not understand wat u said,i also fear u wrongly
    interpreted my question.i meant that the frequency range 88-108 Mhz
    for FM and 540-1600 kHz for AM.is not continuous.
    i.e all frequencies are not used by am broadcast.some frequencies are used by other applications also
    why is it so?
    prateek

  8. COLOUR T.V

    in Projects Q/A

    Posted

    hi all!
    anyone who can relate the reason with high voltage inside the TV?
    AND IF PROPER DOUBLE INSULATION ,WHY ARE NOT OTHER DEVICES LIKE AIR CONDITIONERS,ELECTRIC IRON,REFRIGERATORS MADE SO?
    PRATEEK

  10. Coupling capacitors!

    in Electronics chit chat

    Posted

    hi aludioguru!
    i must add here that some books also say that there is no displacement
    current as such .it is just like a fictitious current just an analogy with
    the psuedo force (backward force when a car starts suddenly)
    this concept is introduced in security of maxwells equations of flux.any replies are welcome
    prateek

  12. TELEVISION

    in Electronics chit chat

    Posted

    hi MP and others!
    I HAVE HEARD PEOPLE say that amateurs should not try to repair atleast the TV or CRT because at some points there is very high voltage inside even more than the supply of 220V.how is it possible and where are these points so that i take care when i repair my TV IN future.
    plz reply
    prateek

  20. Fluke 434 Power Analyzer and 400Hz 3-Phase Power

    in Electronics chit chat

    Posted

    hi jawaking!
    may i know the power level at which you are working at your place?
    if it is upto few watts(within TTL RANGE),YOU CAN USE A RIPPLE COUNTER ,A MOD 8 COUNTER WITH 8 STATES WILL DO THE JOB FOR YOU.YOU MAY HAVE TO APPLY SOME ADDITIONAL CIRCUIT JUST LIKE IN CASE U HAVE SINE WAVE,YOU MAY HAVE TO USE A CONVERTER WHICH
    CONVERTS TO SQUARE WAVE.AT O/P OF LAST FLIP FLOP IN COUNTER,YOU GET FREQUENCY OF 400/8=50 Hz.YOU CAN ALSO USE FREQUENCY CHANGER ICs.BUT FIRST ONE WILL BE BETTER CHOICE.
    PRATEEK

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