How to make 12 V DC source to 5V-10V DC source?

Discussion in 'Homework Help' started by Sajid86, May 4, 2009.

  1. Sajid86

    Thread Starter New Member

    May 4, 2009
    1
    0
    In my Electrical Circuit(DC) course, my teacher asked me to make a 12V DC source to 5V-10V DC Source. Can anyone help me out?
     
  2. whzahp

    New Member

    May 3, 2009
    4
    0
    If u are actually doing this circuit in lab..u can use an LM317 (a variable voltage regulator..see datasheet)..or if u want a fixed o/p voltage u can use a corresponding zener diode of req reverse vtg rating...The simplest soln of all would be to use a voltage divider circuit to get the req o/p vtg across R1 & then allow the 12V-o/p vtg drop across R2..However this will the most inefficient circuit as power deliverd to R2 is simply lost as heat...
     
  3. zero_coke

    Active Member

    Apr 22, 2009
    294
    1
    Use a transformer. First you need to convert DC to AC, and then attach it to a variable transformer, and then back to DC again.
     
  4. Steven_Shi

    New Member

    May 12, 2009
    6
    0
    I think you can try use TL431 , two resistor and one potentiometer to get the

    voltage.
     
  5. sreejisreeni

    New Member

    May 27, 2009
    4
    0
    This can be achieved by using an LM317 as Mr. Possible Soln mentioned.
    Else you can go for a simple buck converter in case if you need higher current....
    If you want to know about the buck converter pls let me know......
     
    Last edited: May 27, 2009
  6. PRS

    Well-Known Member

    Aug 24, 2008
    989
    35
    The LM317 is the easiest method and has decent regulation. But if your teacher doesn't allow for ICs, use a Series Pass transistor as a regulator; it's controlled by a pot to get your variation. If you need this solution, let me know.
     
Loading...