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Posts posted by slackjack

  1. What do the virtual diodes and other virtual components in MULTISIM mean? Does it imply that they are non-ideal and hence practical?

    Virtual components allow you to set their parameters to any value you like — even if you could not actually find a part with those values in real life. Great for illustrating theoretical concepts.
  2. Hey guys,

    I'm trying to design a counter using FF in multisim. I know that I clock signal must come along to for any change to occur in the circuit (I'm forgetting about CLEAR and PRESET for now). What should I use as the souce of the clock in multisim? And another question, what exactly is the source of a clock signal (in a real circuit)? If I open an close a switch, does that create a clock pluse (square wave) that an operate the FF?

    --thank you. 8)

  3. Thanks for the link Shahriar. It seems they have integrated the emitter and receiver circuits.

    D2 picks-up the infra-red beam generated by D1 and reflected by the surface placed in front of it.

    All what this circuit does is detect an object as it moves toward it, in this case the car right? If thats so, then this circuit would do just fine for experimental purposes. A vehicle is relatively wide though. Would it detect a person just as good as the car?
  4. I'm trying to buld this


    Left = transmitter
    Right = receiver

    This circuit has a transmitter and a receiver. So from what I understand, the interruption in a modulated pulsating beam that is transmitted by an infrared diode and received by an infrared transistor sets off the alarm. So what I am looking at is two different circuits. Can't these two be integrated into one circuit?
    So I absolutely must have the circuit with the Photodiode right? If they cant be integrated, how must the receiver be placed with respect to the transmitter?

    What are some uses of a Phototransistor?

    --thank you 8)

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