Subject:
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Re: Polarity of PowerJack from HB und Charger Board
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 3 May 1998 23:32:23 GMT
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Original-From:
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Fred G. Martin <fredm@!nospam!media.mit.edu>
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Viewed:
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2384 times
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on the interface/charger, since there's a bridge rectifier immediately
normalizing the input jack voltage -- regardless of polarity -- it
kind of doesn't matter which polarity you use.
there is a discrepancy between the int/charger schematic and PCB. the
schematic shows the input voltage going to pins 2 and 3 of the bridge,
but on the PCB the input goes to pins 1 and 2.
i'm actually not sure of the internal wiring of the db-101 bridge, so
i can't say whether the schematic is drawn correctly (neglecting the
pin number issue and treating the bridge as a collection of 4 diodes).
i should figure out what the right answer is and revise the schematic.
as a matter of consistency, i assume the center pin negative wiring
when i create a new design (would be bad to have two different kinds
of adapters floating around the lab). so the schematic for the
int/charger breaks this "fred standard adapter" rule. probably, when
i laid out the int/charger board, i knew i was using an integrated
bridge DIP, and i didn't bother to follow my rule because i knew it
wouldn't matter from a practical standpoint.
i still might have gotten the PCB "right" though - it depends on the
arrangement of the diodes in the bridge. in which case i should fix
the schematic.
fred
In your message you said:
> Hi
> I am wondering about the Polarity of the Power Jack at the Handyboard and the
> charger board. At the HB the Pin in the middle is ground. At the charger boar • d
> the outside Ring is ground.Can anybody tell me why it is different ?
>
> Thanks
>
> stefan.schvttler@t-online.de
>
>
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