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!#@ capacitor mistake of not. — Parallax Forums

!#@ capacitor mistake of not.

ArchiverArchiver Posts: 46,084
edited 2000-08-20 20:01 in General Discussion
i have a boe board and i was playing around with the 3300 uf cap and a nine volt battery wen i went to but the cap back on the boe board conected to Vdd and Vss i forgot to discharge it and now i can write to it.· it is detected but says check power supply.

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2000-08-20 02:15
    Todd:
    Many regulators are easily damaged by applying voltage to their output
    terminal with no input voltage. This is what you may have done with the
    charged cap. If so, you probably just have to change the regulator.

    Ray McArthur
    Original Message
    From: Todd W <toad1611@y...>
    To: <basicstamps@egroups.com>
    Sent: Saturday, August 19, 2000 8:03 PM
    Subject: [noparse][[/noparse]basicstamps] !#@ capacitor mistake of not.


    i have a boe board and i was playing around with the 3300 uf cap and a nine
    volt battery wen i went to but the cap back on the boe board conected to Vdd
    and Vss i forgot to discharge it and now i can write to it. it is detected
    but says check power supply.
  • ArchiverArchiver Posts: 46,084
    edited 2000-08-20 16:07
    I agree with Ray. I even think it's the only way to destroy a
    regulator...Anyway, there is a trick to avoid this problem : put a diode
    between input and output of the regulator (anode to the output, cathode to
    the input, FOR A POSITIVE VOLTAGE REGULATOR).
    If the output voltage becomes higher than the input, the current will flow
    thru the diode.
    Best regards,

    Philippe Derenne
    Original Message
    From: rjmca <rjmca@w...>
    To: <basicstamps@egroups.com>
    Sent: Sunday, August 20, 2000 3:15 AM
    Subject: Re: [noparse][[/noparse]basicstamps] !#@ capacitor mistake of not.


    > Todd:
    > Many regulators are easily damaged by applying voltage to their output
    > terminal with no input voltage. This is what you may have done with the
    > charged cap. If so, you probably just have to change the regulator.
    >
    > Ray McArthur
    >
    >
    Original Message
    > From: Todd W <toad1611@y...>
    > To: <basicstamps@egroups.com>
    > Sent: Saturday, August 19, 2000 8:03 PM
    > Subject: [noparse][[/noparse]basicstamps] !#@ capacitor mistake of not.
    >
    >
    > i have a boe board and i was playing around with the 3300 uf cap and a
    nine
    > volt battery wen i went to but the cap back on the boe board conected to
    Vdd
    > and Vss i forgot to discharge it and now i can write to it. it is
    detected
    > but says check power supply.
    >
    >
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2000-08-20 20:01
    The main regulator is fine but the stamp itself is messed up. I spent a
    while checking everything out and there is not +5v on pin 2 of the pic16c57
    is my bs2 garbage now or what?






    >
    > > i have a boe board and i was playing around with the 3300 uf cap and a
    > nine
    > > volt battery wen i went to but the cap back on the boe board conected to
    > Vdd
    > > and Vss i forgot to discharge it and now i can write to it. it is
    > detected
    > > but says check power supply.
    > >
    > >
    > >
    > >
    > >
    > >
    >
    >
    >


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