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Ground plane — Parallax Forums

Ground plane

ArchiverArchiver Posts: 46,084
edited 2002-01-27 19:22 in General Discussion
Hello,
I have a board with a ground plane and before holding the BS2 and other IC's
in sockets I tested the board power.
I have connected the o/p of the transformer ( 220V/9V ) to the board power
supply and the dc voltage was OK but there is something I have found , when
I touch the ground area I feel a little vibration in my finger,it seems like
a kind of ac source.This disappear when I reverse the main terminal.Any
explanation would be appreciated.


Thank You
Mohamed Refky




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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-01-26 17:22
    I would suggest you use a UL approved power supply for your stamp and
    disconnect the 220 VAC, BEFORE YOU GET KILLED!! While you were feeling
    that "tingle" if had touched a metal object or stood on a wet concrete
    floor, you would be speaking to the man upstairs.

    regards,

    Leroy

    Mohamed REFKY wrote:
    >
    > Hello,
    > I have a board with a ground plane and before holding the BS2 and other IC's
    > in sockets I tested the board power.
    > I have connected the o/p of the transformer ( 220V/9V ) to the board power
    > supply and the dc voltage was OK but there is something I have found , when
    > I touch the ground area I feel a little vibration in my finger,it seems like
    > a kind of ac source.This disappear when I reverse the main terminal.Any
    > explanation would be appreciated.
    >
    > Thank You
    > Mohamed Refky
    >
    > _________________________________________________________________
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  • ArchiverArchiver Posts: 46,084
    edited 2002-01-26 18:40
    Original Message
    From: "Larry Gaminde" <@#LGaminde@t...>
    To: <basicstamps@yahoogroups.com>
    Sent: January 26, 2002 9:09 AM
    Subject: Re: [noparse][[/noparse]basicstamps] Ground plane


    Could just be transformer hum! Use a scope.

    Original Message
    From: "Chris Loiacono (E-mail)" <chris01@t...>
    To: <basicstamps@yahoogroups.com>
    Sent: January 26, 2002 12:16 PM
    Subject: RE: [noparse][[/noparse]basicstamps] Ground plane


    Mohamed, are you saying that you have a transformer w/ a 220V
    primary, and a
    9V secondary winding directly connected to a logic-level supply
    on your
    board? Is the secondary center-tapped, and the ground plane
    common to the
    tap? I guess without knowing your power supply configuration from
    the AC
    line to the final DC output, there are a number of possible
    things going on.
    WIthout knowing what caps you are using, where the Transformer
    is, etc, it
    would be hard to do more than speculate.

    Chris


    Hello,
    I have a board with a ground plane and before holding the BS2 and
    other IC's
    in sockets I tested the board power.
    I have connected the o/p of the transformer ( 220V/9V ) to the
    board power
    supply and the dc voltage was OK but there is something I have
    found , when
    I touch the ground area I feel a little vibration in my finger,it
    seems like
    a kind of ac source.This disappear when I reverse the main
    terminal.Any
    explanation would be appreciated.


    Thank You
    Mohamed Refky




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  • ArchiverArchiver Posts: 46,084
    edited 2002-01-26 20:16
    Mohamed, are you saying that you have a transformer w/ a 220V primary, and a
    9V secondary winding directly connected to a logic-level supply on your
    board? Is the secondary center-tapped, and the ground plane common to the
    tap? I guess without knowing your power supply configuration from the AC
    line to the final DC output, there are a number of possible things going on.
    WIthout knowing what caps you are using, where the Transformer is, etc, it
    would be hard to do more than speculate.

    Chris


    Hello,
    I have a board with a ground plane and before holding the BS2 and other IC's
    in sockets I tested the board power.
    I have connected the o/p of the transformer ( 220V/9V ) to the board power
    supply and the dc voltage was OK but there is something I have found , when
    I touch the ground area I feel a little vibration in my finger,it seems like
    a kind of ac source.This disappear when I reverse the main terminal.Any
    explanation would be appreciated.


    Thank You
    Mohamed Refky




    _________________________________________________________________
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    To UNSUBSCRIBE, just send mail to:
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  • ArchiverArchiver Posts: 46,084
    edited 2002-01-27 19:22
    Yes, the transformer is a 220V primary and a 9V secondary.
    The 9V connected to the bridge rectifier ==> 1000uF filter capacitor ==>
    7805
    The output of the bridge for the BS2 and the 5V for other components.


    >From: "Chris Loiacono \(E-mail\)" <chris01@t...>
    >Reply-To: basicstamps@yahoogroups.com
    >To: <basicstamps@yahoogroups.com>
    >Subject: RE: [noparse][[/noparse]basicstamps] Ground plane
    >Date: Sat, 26 Jan 2002 12:16:43 -0800
    >
    >Mohamed, are you saying that you have a transformer w/ a 220V primary, and
    >a
    >9V secondary winding directly connected to a logic-level supply on your
    >board? Is the secondary center-tapped, and the ground plane common to the
    >tap? I guess without knowing your power supply configuration from the AC
    >line to the final DC output, there are a number of possible things going
    >on.
    >WIthout knowing what caps you are using, where the Transformer is, etc, it
    >would be hard to do more than speculate.
    >
    >Chris
    >
    >
    >Hello,
    >I have a board with a ground plane and before holding the BS2 and other
    >IC's
    >in sockets I tested the board power.
    >I have connected the o/p of the transformer ( 220V/9V ) to the board power
    >supply and the dc voltage was OK but there is something I have found ,
    >when
    >I touch the ground area I feel a little vibration in my finger,it seems
    >like
    >a kind of ac source.This disappear when I reverse the main terminal.Any
    >explanation would be appreciated.
    >
    >
    >Thank You
    >Mohamed Refky
    >
    >
    >
    >
    >_________________________________________________________________
    >Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.
    >
    >
    >To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    >from the same email address that you subscribed. Text in the Subject and
    >Body of the message will be ignored.
    >
    >
    >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
    >
    >To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    >from the same email address that you subscribed. Text in the Subject and
    >Body of the message will be ignored.
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    >
    >




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