+ Post New Thread
Results 1 to 16 of 16
  1. #1
    Advanced Member level 1
    Points: 3,692, Level: 14

    Join Date
    May 2006
    Posts
    412
    Helped
    24 / 24
    Points
    3,692
    Level
    14

    24 to 12 volts regulators

    ASA to ALL
    im working on micronontroller based circuit .... circuit will drive by car bettery 12V or 24V.... in case of using simple 7805 regulator it become hotter though i screw heat sink with that regulator. pls share me some idea to make some reliable regulator cicuit. wich remain cool upto 3 amps.
    regards

    •   Alt27th January 2008, 19:02

      advertising

        
       

  2. #2
    Advanced Member level 5
    Points: 14,575, Level: 29
    blueroomelectronics's Avatar
    Join Date
    Sep 2006
    Location
    Toronto, Canada
    Posts
    1,682
    Helped
    178 / 178
    Points
    14,575
    Level
    29

    2 transistor black regulator

    Try an National Semiconductor Simple Switcher.



  3. #3
    Full Member level 5
    Points: 4,033, Level: 14

    Join Date
    Mar 2002
    Posts
    301
    Helped
    12 / 12
    Points
    4,033
    Level
    14

    3amps regulators

    Hi. You may use LM2576-5.0(or -ADJ). Look here:
    \http://www.national.com/mpf/LM/LM2576.html

    Best Regards.



  4. #4
    Advanced Member level 1
    Points: 3,692, Level: 14

    Join Date
    May 2006
    Posts
    412
    Helped
    24 / 24
    Points
    3,692
    Level
    14

    7805 10a regÜlatÖr

    thx both of you pal..... i appriciate if some one give some idea using convetionel regulator ICs and transistors.



    •   Alt28th January 2008, 06:44

      advertising

        
       

  5. #5
    Full Member level 2
    Points: 2,200, Level: 10

    Join Date
    Jul 2006
    Location
    Bucharest, Romania
    Posts
    142
    Helped
    31 / 31
    Points
    2,200
    Level
    10

    make 12 and 5 volt ciruct from 24 volts

    Try a Linear Technology step down switcher



  6. #6
    Advanced Member level 3
    Points: 7,719, Level: 20

    Join Date
    Apr 2006
    Location
    Hyderabad, India.
    Posts
    755
    Helped
    119 / 119
    Points
    7,719
    Level
    20

    24 volts 5 volts

    Quote Originally Posted by drbizzarow
    thx both of you pal..... i appriciate if some one give some idea using convetionel regulator ICs and transistors.
    At 3amps load current it is better to use smps, then conventional regulators,with specific need to improve on enery losses, uising power from a car battery.

    Sarma



  7. #7
    Member level 3
    Points: 2,535, Level: 11

    Join Date
    Feb 2006
    Posts
    54
    Helped
    6 / 6
    Points
    2,535
    Level
    11

    3a regulators

    use LM2595 regulator with 100khz switching supply.
    or use 7805 with any 10A bipolar transister as driver.



    •   Alt28th January 2008, 11:03

      advertising

        
       

  8. #8
    Newbie level 4
    Points: 904, Level: 6

    Join Date
    Jan 2008
    Posts
    7
    Helped
    0 / 0
    Points
    904
    Level
    6

    7805 regulator circuit

    I have the circuit.
    I can send you my circuit design.
    Send me your e-mail. pls

    Quote Originally Posted by drbizzarow
    ASA to ALL
    im working on micronontroller based circuit .... circuit will drive by car bettery 12V or 24V.... in case of using simple 7805 regulator it become hotter though i screw heat sink with that regulator. pls share me some idea to make some reliable regulator cicuit. wich remain cool upto 3 amps.
    regards



  9. #9
    Advanced Member level 1
    Points: 3,692, Level: 14

    Join Date
    May 2006
    Posts
    412
    Helped
    24 / 24
    Points
    3,692
    Level
    14

    12v 3a regulator circuit

    thx my email is hatetoshare@hotmail.com u can private msg me thx in advance



  10. #10
    Advanced Member level 1
    Points: 3,692, Level: 14

    Join Date
    May 2006
    Posts
    412
    Helped
    24 / 24
    Points
    3,692
    Level
    14

    7805 design

    hi tukul12....
    im waiting for your mail



  11. #11
    Junior Member level 2
    Points: 1,767, Level: 9

    Join Date
    Jan 2004
    Posts
    23
    Helped
    4 / 4
    Points
    1,767
    Level
    9

    24 to 12 regulators

    don't sure about amps and volts, but maybe this will be useful The 2-transistor Black regulator
    http://www.romanblack.com/smps/smps.htm



  12. #12
    Junior Member level 1
    Points: 1,073, Level: 7

    Join Date
    Aug 2007
    Posts
    19
    Helped
    1 / 1
    Points
    1,073
    Level
    7

    24 volts vs 5 volts

    Hi you can use PQ30RV31 is a nice and cheap LVD 3A 1.5 to 30 volts from SHARP . gogle it

    regards



  13. #13
    Advanced Member level 1
    Points: 3,692, Level: 14

    Join Date
    May 2006
    Posts
    412
    Helped
    24 / 24
    Points
    3,692
    Level
    14

    tps5430 smps circuit

    thx CapBlack .....
    let me chk the local market this chip avilabelity... and cost.



  14. #14
    Advanced Member level 5
    Points: 40,208, Level: 49

    Join Date
    Apr 2002
    Location
    USA
    Posts
    3,944
    Helped
    649 / 649
    Points
    40,208
    Level
    49

    7805 regulator 3a

    Hi drbizzarow, Any linear regulator (such as PQ30RV31) will get just as hot as your original 7805 design.

    To reduce power dissipation (heat), you must use a switching regulator, as suggested by several folks above.

    Possibly helpful: National Semiconductor has an on-line tool for designing and simulating power supplies, and for buying a kit of parts. You may need to register, but it's free.
    http://www.national.com/appinfo/webe...=power&step=0A



  15. #15
    Advanced Member level 4
    Points: 11,875, Level: 26
    bobcat1's Avatar
    Join Date
    Jul 2002
    Posts
    1,292
    Helped
    96 / 96
    Points
    11,875
    Level
    26

    7805 3a circuit

    Hi

    Use TI TPS5430 single SO8 device with up to 3A of current and 9~30V input range

    All the best

    Bobi



  16. #16
    Advanced Member level 1
    Points: 3,692, Level: 14

    Join Date
    May 2006
    Posts
    412
    Helped
    24 / 24
    Points
    3,692
    Level
    14

    reduce 12 volts to 5 volts

    thx echo47... u r right my circuit will drive by 12 volt car battery system or 24 volt car battery system.... so main problem is to reduce heat.



+ Post New Thread
Please login