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Recent content by Faiyaz

  1. Faiyaz

    what does operating voltage of solar panel mean????

    Maybe.. Maybe these are the output specifications of the solar Panels
  2. Faiyaz

    Beginning Components

    want components for free? There is one place where you can get all the components in the world and can create any ckt of your choice, including a CRO, and any device required for testing. Why don't you try a simulation software. I have been using them over the years and they seem to work...
  3. Faiyaz

    What does Vcc stand for?

    Whenever the supply to a Transister (or TTL circuit) is connected between the collector and ground it is a standard to notify it as Vcc. If you connect the supply between Base and ground we will call it Vbb and the same goes with Vee for emitter to ground. Since there is no notion to identify...
  4. Faiyaz

    Why is a transistor a current controlled device

    Thank you ROn H. For once there is some one who agrees with me. I actually lost a job because of making such a statement.
  5. Faiyaz

    oscillators

    Noise is generated within ckt elements such as resistors etc. The one generated in resistors is also known as shot noise. Now suppose you are using an RC oscillator as the feedback network and an opamp as a amplifying device, then by Barkhausens criteria the gain * feedback = 1 for sustained...
  6. Faiyaz

    PWM doubt

    The average voltage Due to PWM is given by the integration of the total amplitude of pulses. Therefore although the frequency will not effect the o/p , it does effect the accuracy of the signal o/p.
  7. Faiyaz

    Need help with relay circuit

    But while the phone is ringing, I suppose the o/p will not remain steady, ie the radio may be muted and put on in rapid succession, whereby causing harm to the radio cktry. What can be done about that? ( A phone ring is not a contineous signal whereby causing the variation in output from ) to...
  8. Faiyaz

    capacitors

    Just to add a few more points, A capacitor added in series is basically a blocking capacitor, and one added in parallel to a ckt is for filtering, but the list does not end here. Although in Polar capacitors the polarity has to be taken care of, (You dont have to worry as they are properly...
  9. Faiyaz

    comparator question

    What you exactly need is a Schmitt trigger ckt (using opamp) with positive feedback. The feed back will act as your trigger Vth and Lth via a feedback resistor network and also provide the necessary hysteresis. The ckt will be available in any book dealing with opamps
  10. Faiyaz

    Need help with relay circuit

    A transistor BC 547 can do the job. simply connect your relay in series between the Vcc ( atleast 6 V ) and collector of BC547. Apply the 1.5 V control signal directly to the base of the transistor ( or through a current limiting resistor if necessary). Practically to use a transistor as a...
  11. Faiyaz

    ZCD saturates! Please advise

    I tried building a ZCD (zero crossing detector) making use of the 741 opamp. The supply provided by me was +15V and GND to pin 7 instead of negative voltage.( I wanted to make use of single supply). The problem occuring is that the o/p of opamp saturates and does not change its state when the...
  12. Faiyaz

    Battery power

    A low voltage comparator may be able to do the job if designed properly. If the instrument you want to control is hi-tech then a microntroller can very easily work as your comparator and at the same time consume very less current (the one's available with a sleep mode)
  13. Faiyaz

    Flux! - It's not a dirty word.

    I have heard of certain flux which give off poisonous fumes. Certain manufacturers that produce solder wire down here in india add excessive flux into the solder wire to increase its weight. This makes the solder wire look like a hose pipe and the weight increases the price.
  14. Faiyaz

    Why is a transistor a current controlled device

    Then I am not wrong in stating that a transister is a voltage controlled device? Although the input impedance may be low, but it is a fact that ultimately it is the VBE that controls the flow of current through the emitter junction which in turn controls collecter current. Variations in VBE...
  15. Faiyaz

    Why is a transistor a current controlled device

    Why is a transistor a current controlled device when actually it is the potential across the BE junction that controls the operation of a transistor? Or am I wrong in making such a statement? :?:
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