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Thread: Epia - Tc DIY Power Regulator

  1. #1
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    Epia - Tc DIY Power Regulator

    Power Regulator This looks interesting. Ive been trying to look into parts cost any one think it would be worth it to go for this as opposed to a carnetix 2190. My Mobo has a 12v input

    My Mobo

  2. #2
    Maximum Bitrate psyrex's Avatar
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    It only works when the car is on. If you turn the car off, voltage drops below the 13-ish needed and your board will just stop receving power - no time for graceful shutdowns/hibernation/suspend.

  3. #3
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    this is on his site. he built it to work with his regulator. its a control board and he even said on the first page and i quote
    Also I wanted to run PC for a while after engine is turned off, to shut down the PC gracefully. While that time, it is powered by battery rather than alternator, then it can't supply 12V because the regulator drops 1V. So, I experimented with LM1084, inserting it between PC and the power brick. Then, although output voltage became 11V, PC worked without a problem.
    So im not sure if you just dismissed it too quickly or if im missing something

  4. #4
    Maximum Bitrate psyrex's Avatar
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    i did dismiss it too quickly. Sorry. However, a few more notes:

    - the second link you provided is simply a controller, it's operation is independent of the power supply.

    - he got his stuff to work, but that doesn't guarantee that you will get yours to work. According to the manual for the TC, you need 11.4-12.6v. You're taking a gamble to feed the board the 11v you'll get after the engine is turned off. Good luck.

  5. #5
    Variable Bitrate
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    And what about ignition, when the voltage drops below 9V???

  6. #6
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    The controller is a separate thing but it connects directly to the regulator. So i would build both (if i even did this). I think the idea is great but i really want something so i can start the boot, or un-hibernate on my way to the car maybe a little IrDA momentary switch (any ideas). I think a carnetix set up would be perfect for me i was just looking for a alternate solution.
    The power controller should work like this

    1. Turn relay off (initial state)
    2. Wait for ignition switch turned on
    3. Wait for supply voltage becomes high (engine starts and stabilizes)
    4. Turn relay on, then wait for voltage stabilization
    5. Send a pulse to power switch, then again wait for voltage stabilization (PC starts)
    6. Wait for ignition switch turned off (PC running)
    7. Send a pulse to power switch (start shutdown)
    8. After certain amount of time, go to 1.
    Im just not sure i want to try it on my board. Can under powering cause long term damage. i know too much power can start fires/melt stuff but is under powering that bad?

    Thanks for the responses and let me know what you think

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