NEED HELP PLEASE!!!! PLEASE!!!!!

Discussion in 'Homework Help' started by Electronics_student, Dec 11, 2008.

  1. Electronics_student

    Thread Starter New Member

    Dec 3, 2008
    8
    0
    Hi thanks for caring!

    I need to design a dual-Rail DC Power Supply for my university work and don't have a clue i tried working it out and surfing the web but no luck.

    I have to use 2 diodes, 2 Zener Diodes, 2 Resistors and 2 Capacitors (1micro farad).

    Does anyone know? i would appreciate it so much if someone could help!


    Thank you so much!!!
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    64
    What do you want to power?
    Or is it a power supply project?

    You can use a center tapped transformer, rectify its AC output, filter it with a capacitor filter and then use voltage regulators to regulate the output voltage.
     
  3. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    You have only two diodes so the transformer must have a center-tap and the diodes are each a half-wave rectifier. Lookup Half-wave rectifier in your textbook or in Google.

    The filter capacitors have a very low value but will work if the zener diode current and load currents are low.

    The resistors feed the zener diodes. Lookup Zener Diode in your textbook or in Google.
     
  4. Electronics_student

    Thread Starter New Member

    Dec 3, 2008
    8
    0
    Hi thanks for the quick response. The power supply is just a project i don't actually have to power anything up. Also correct about using the center tapped transformer. I have a more than basic understanding of electronics but im struggling to picture it.
    So just wanted to know where i could see a circuit diagram of this??????????????


    Still finding it really hard????????????? Any idea where i could see this????????
     
  5. Electronics_student

    Thread Starter New Member

    Dec 3, 2008
    8
    0
    Do you know where i can see a circuit diagram of this please????
     
  6. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    It is an extremely simple circuit, what is your difficulty?
    Did you lookup half-wave rectifier?
    Did you lookup zener diode?
    Please draw the circuit.
     
  7. SgtWookie

    Expert

    Jul 17, 2007
    22,183
    1,732
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