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Is it toast? — Parallax Forums

Is it toast?

bxgirtenbxgirten Posts: 79
edited 2007-02-16 15:58 in General Discussion
Working too late last night, I accidentally provided 7.65V of AC to the 9V terminal of the BOE for a few seconds. This morning, I used what was left of a spent 9V battery (about 7V). IDE said it didn't detect the Javelin. Did I fry it?

Comments

  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2007-02-15 19:29
    Probably.
    I use a series diode (1N4007) on my own boards to
    protect against reversed connected power supplies.

    regards peter
    ·
  • bxgirtenbxgirten Posts: 79
    edited 2007-02-15 20:17
    Peter,

    Thanks for the insight. I suppose it doesn't matter that I using it on a BOE board? If I use the diode, how would I connect it using that board?
  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2007-02-15 20:28
    You can make a little adapter with a dcplug like the one on your dc adapter,
    and a socket as on the board, and mounting the diode inbetween.
    adapter dcplug -> socket -> [noparse][[/noparse]diode anode
    diode cathode] -> dcplug -> board socket
    If you then happen to insert an AC adapter instead of DC adapter, the diode
    will block the negative halve of the AC power.

    regards peter
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-02-15 22:52
    Hello,

    The problem is that Vin goes directly to the Module on the BOE. It doesn’t go through the BOE 5V regulator. In any event you can get a ½ price replacement by contacting our Tech Support Dept. Take care.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Chris Savage
    Parallax Tech Support
  • bxgirtenbxgirten Posts: 79
    edited 2007-02-16 15:58
    Thanks, Chris! This is very helpful.
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