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Thread: 12v Regulator Schematic (15A)

  1. #21
    MySQL Error MatrixPC's Avatar
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    Well I will build this circuit and test it out with a full ATX mobo(config within 120W) to see if it has any problem. It wouldn't hurt to burn one of those rather than the via M1000N because I have some of those P3 PC laying around doing nothing.

    Maybe we can extend this circuit to be the shutdown controller.
    2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
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  2. #22
    Maximum Bitrate MaleBuffy's Avatar
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    Could do......I am waiting for your test results!

  3. #23
    Raw Wave Rob Withey's Avatar
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    This is essentially a linear regulator. There is no way it can sustain a 12v output with less than 12v input. You pay a Vbe drop across the 2N3055. Those simulations that indicate the output is 12v with an input of 1.5v are misleading to say the least. To boost voltage you need AC and reactive components (that voltage will be coming out of charged capacitors, and under load will discharge fairly rapidly).


    Rob
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  4. #24
    Raw Wave
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    Yup, the simulation is not correct...try to stick in a 2.4Ohms resistor as a load.

    Also your supply is going through a 1KOhms voltage divider. The supply voltage need to be very stiff. A car battery is capable of supplying very high current. So in your simulations you should supply alot more current if you gonna drain 5A.


  5. #25
    MySQL Error MatrixPC's Avatar
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    Well the 1KOhm voltage divider is there to simulate the change in the car voltage. It's not there in the original schema.
    I know the car current is much higher than what in the simulator, but at least it show the state of the output voltage.
    With a 1.4Ohm resistor connect in series with the last volt meter, the drop is a bit faster but it still showing 11.6V for about 5 min when input @ 7.5V.

    BTW, I am not an EE guy so I don't know much about the electrical stuff.
    2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
    89 Supra Turbo P3 600E@750/Abit BE6 II, Alpine M-BUS Car2PC.
    Y2K Accord Dell GX150
    RoadRunner is the best FE PERIOD
    EmoRebellion is a SCAMMER

  6. #26
    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by MatrixPC
    With a 1.4Ohm resistor connect in series with the last volt meter, the drop is a bit faster but it still showing 11.6V for about 5 min when input @ 7.5V.
    Put it in parallel with the voltmeter to simulate a load. Ie, output down to ground.


    Rob
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  7. #27
    Raw Wave
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    BTW, I am not an EE guy so I don't know much about the electrical stuff.

    You guys are doing well though

  8. #28
    MySQL Error MatrixPC's Avatar
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    Man in parallel, it's a different story.
    Anyway, I will try to build the circuit and stick an 100W H3 bulb in there as the load to see what happen.
    2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
    89 Supra Turbo P3 600E@750/Abit BE6 II, Alpine M-BUS Car2PC.
    Y2K Accord Dell GX150
    RoadRunner is the best FE PERIOD
    EmoRebellion is a SCAMMER

  9. #29
    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by MatrixPC
    Man in parallel, it's a different story.
    And the story is what? Does the voltage drop off real quick by any chance?


    Rob
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  10. #30
    MySQL Error MatrixPC's Avatar
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    Well at 14.5 V input, the output is at 11.8V. It drop down to 8.5V if the input is at 10V.
    If you guys wanna try it out, the software is Preteus 6 by Labcenter Electronics in UK. I am using the demo version so I can't save the design.
    2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
    89 Supra Turbo P3 600E@750/Abit BE6 II, Alpine M-BUS Car2PC.
    Y2K Accord Dell GX150
    RoadRunner is the best FE PERIOD
    EmoRebellion is a SCAMMER

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