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5 volt regs for Stamp — Parallax Forums

5 volt regs for Stamp

ArchiverArchiver Posts: 46,084
edited 2002-07-03 05:31 in General Discussion
The small onboard regulator marked p30A.
Original Message
From: Newzed@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=jkXdN751u6Qy8mOdb7sPl3IeGqxmRrjHHJMRJm1S5vzXlu6z4N-EWKxgC_obslbpcTxf0hrb]Newzed@a...[/url
Sent: Tuesday, July 02, 2002 1:19 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] 5 volt regs for Stamp

In a message dated 7/2/02 13:14:18 Eastern Daylight Time,
porter.sadler@s... writes:


> I have a couple of bs2 around with the 5volt regs blown.
> Classic not haveing a current limiting resistor when inputs switch to
> outputs. (stupid)
>
> anyone know where I can get a few (10-20) of these little chips.
>
>

Are you talking about the 7805 or the on-board regulator ?

Sid


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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-07-02 18:13
    I have a couple of bs2 around with the 5volt regs blown.
    Classic not haveing a current limiting resistor when inputs switch to
    outputs. (stupid)

    anyone know where I can get a few (10-20) of these little chips.
  • ArchiverArchiver Posts: 46,084
    edited 2002-07-02 18:19
    In a message dated 7/2/02 13:14:18 Eastern Daylight Time,
    porter.sadler@s... writes:


    > I have a couple of bs2 around with the 5volt regs blown.
    > Classic not haveing a current limiting resistor when inputs switch to
    > outputs. (stupid)
    >
    > anyone know where I can get a few (10-20) of these little chips.
    >
    >

    Are you talking about the 7805 or the on-board regulator ?

    Sid


    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2002-07-02 18:32
    In a message dated 7/2/02 13:23:51 Eastern Daylight Time,
    porter.sadler@s... writes:


    > The small onboard regulator marked p30A

    Are you sure about the part number. The only p30a I know of is a 5kp30a
    which is a 5000 watt transient voltage suppressor. If that is the right part
    number you might try Parallax,

    Sid


    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2002-07-02 18:43
    Go to www.digikey.com and do a search for LM7805
    -=Randy
    sadlpx <porter.sadler@s...> wrote: I have a couple of bs2 around with
    the 5volt regs blown.
    Classic not haveing a current limiting resistor when inputs switch to
    outputs. (stupid)

    anyone know where I can get a few (10-20) of these little chips.


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  • ArchiverArchiver Posts: 46,084
    edited 2002-07-02 23:14
    I believe the stamp2 uses an LM2936 5 volt regulator in surface mount form.
    I do not think you would be able to hurt this regulator by shorting the PIC
    pins. The LM2936 has very good short circuit protection built in.

    Shorting the pins can damage the PIC, which in turn might cause the PIC to
    ask for more than the 50 milliamps available from the regulator, forcing it
    to go into shut down mode.

    fwiw

    Steve


    At 10:43 AM 7/2/02 -0700, you wrote:

    > Go to www.digikey.com and do a search for LM7805
    >-=Randy
    > sadlpx <porter.sadler@s...> wrote: I have a couple of bs2 around
    > with the 5volt regs blown.
    >Classic not haveing a current limiting resistor when inputs switch to
    >outputs. (stupid)
    >
    >anyone know where I can get a few (10-20) of these little chips.
    >
    >
    >To UNSUBSCRIBE, just send mail to:
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    >Body of the message will be ignored.
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    >
    >
    >
    >
    >
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    >
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    >
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  • ArchiverArchiver Posts: 46,084
    edited 2002-07-03 05:31
    http://www.national.com/ds/LM/LM2936-5.0.pdf

    sargent@s... wrote:
    >
    > I believe the stamp2 uses an LM2936 5 volt regulator in surface mount form.
    > I do not think you would be able to hurt this regulator by shorting the PIC
    > pins. The LM2936 has very good short circuit protection built in.
    >
    > Shorting the pins can damage the PIC, which in turn might cause the PIC to
    > ask for more than the 50 milliamps available from the regulator, forcing it
    > to go into shut down mode.
    >
    > fwiw
    >
    > Steve
    >
    > At 10:43 AM 7/2/02 -0700, you wrote:
    >
    > > Go to www.digikey.com and do a search for LM7805
    > >-=Randy
    > > sadlpx <porter.sadler@s...> wrote: I have a couple of bs2 around
    > > with the 5volt regs blown.
    > >Classic not haveing a current limiting resistor when inputs switch to
    > >outputs. (stupid)
    > >
    > >anyone know where I can get a few (10-20) of these little chips.
    > >
    > >
    > >To UNSUBSCRIBE, just send mail to:
    > >basicstamps-unsubscribe@yahoogroups.com
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    > >Body of the message will be ignored.
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    > >
    > >
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    > >New! SBC Yahoo! Dial - 1st Month Free & unlimited access
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    > >
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