Ground plane
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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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.
Comments
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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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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http://explorer.msn.com/intl.asp.
To UNSUBSCRIBE, just send mail to:
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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
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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.
>
>
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>
>
>
>To UNSUBSCRIBE, just send mail to:
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>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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