PIC powered by capacitor for 0,5 second

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  1. - 22nd August 2007, 21:51 #1
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    Post removed. I will post again a new version.

    Luciano
    Last edited by Luciano; - 22nd August 2007 at 22:00.
  2. - 22nd August 2007, 22:01 #2
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    Hi Luciano,

    Thanks for the very quick reply.

    Did you intentionally invert pin1 (Vdd) and pin3?

    How is the resistor going to slow-down the discharge into the PIC?

    I need to keep the PIC powered ON during 0,5 second even if the switch is open.

    Meanwhile, I'll try you suggestion out.

    *** Okay. Just saw your last message.
    Roger
  3. - 22nd August 2007, 22:08 #3
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    What is the used voltage, or what will be the voltage in the final design?
  4. - 22nd August 2007, 22:09 #4
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    It's a gadget for a car.

    I'll use a 7805 to make a clean +5VDC.
    Roger
  5. - 22nd August 2007, 22:48 #5
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    This is what happens with 1000 μF and a load of 1.62 mA.



    Luciano
  6. - 23rd August 2007, 10:13 #6
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    I suppose that a 4700 is the minimum capacitor to use. There are .5 and 1 Farad capacitors in low voltage now available to power RTC's instead of coin batteries. Why not use one?

    Take a look at http://catalog.digikey.com/scripts/p...?name=P6955-ND

    Ioannis

    P.S. By the way, nice instrument Luciano!
    Last edited by Ioannis; - 23rd August 2007 at 10:17.
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  7. - 23rd August 2007, 10:59 #7
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    Quote Originally Posted by Luciano View Post
    This is what happens with 1000 μF and a load of 1.62 mA.



    Luciano
    Hi, Luciano

    Nice to see you back here !

    mmmmmmh, By the way ....

    You gave the PEAK current ... as it decreases with power Voltage.

    A JFET could have been a better current drain than the 2.7k.

    Were nice holidays, weren't ??? You're not totally back it seems ... LOL !!!

    Best Regards
    Alain
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    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  8. - 23rd August 2007, 14:45 #8
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    Hello Alain,

    Could you give me some more details about how to connect the transistor and even why this would be a better choice please?
    Roger
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