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Posts posted by dlkosmas

  1. Hi to all,

    I have a problem i would like some help if anyone knows.

    I would like to learn how to calculate a Scr's characteristics for power cirquits.

    Lest say for example we have a half-way single-phase rectifier.
    If i want the transition times to be 2mS or 50uS and the Scr should have 1.2 voltage drop when in the ON state,how do i calculate the characteristics of Scr,and everything else that is needed?

    any tutorial in this subject will be greatly appreciated!


  2. Ok,i did it using 4 D flip flop and present state-Next state tables.Then with Karno maps i found the logical equation for each output(LED)
    Complex but yet doable.

    It is easy to do it using a microprossecor.I just want to start programmin PLDs.

  3. Does anyone know how to design a digital counter that produces a specific number of non-sequential number? for example( decimal) : 1,5,3,7,9,12
    and then repeat it using flip flops? If you know any good site i would appreciate it

  4. Well,a Transceiver can transmit DTMF tones and receive,as well.
    You enter the number in a binary form and you get the DTMF tone in the output.Also,if you use it for receiving DTMF tones,you get the binary form of the number that you,or someone else send through the telephone.It has registers that control its functions and you need a MCU to control it.

  5. In a word,DTMF are those musical tones you hear when you are dialing a telephone number.Every DTMF signal is a mixture of two tones with different frequencies(one HIGH and one LOW freq.).With a DTMF transceiver you can decode( DTMF to binary) DTMF signals and encode(Generate).Thus,connecting it to a telephone line wil enable you to dial a number.More information you can find,well,in Google :)

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