Recent content by pmostafa

  1. P

    How to make the sound of my doorbell circuit louder?

    I have used one UM66 IC, one BC547 Transistor and one 100 Ohm resistor. The circuits of door bell are as follows but same result. The loudness is extremely poor against both the circuits. How can I increase the loudness? Would you please help me in this regard?
  2. P

    Which causes an object to become invisible, regular or diffused?

    I would like to know object undergoes invisible for which reflection, Regular or Diffused.
  3. P

    Which causes an object to become invisible, regular or diffused?

    When an object becomes invisible when it undergoes “regular” or “diffused” reflection?
  4. P

    Bright light from white light connected 240ac through 1k

    I have connected 4 White LEDs with 240ac main through 1K resistor in series. The brightness of the output is not satisfactory. What can i resolve this issue? Thanks
  5. P

    Designing an Electronic Timer Circuit Using NE555 IC or BC548 Transistor

    Dear I would like to design a simple electronic timer circuit by other NE555 IC or BC548 Transistor. I’ve got a circuit but it doesn’t work. Would you please me in this regard? Appreciate, if you would get back to me with tested circuit diagram at your best possible time. Regards Pervez
  6. P

    How to design home use wacky talky circuit on breadboard?

    I want to design a simple home use electronic wacky talky. Please help.
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