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Subject: RE: [M]: Connecting Lx200 with ECU
From: B. S. Jones
Reply To: mapug@shore.net
Date: Wed Jul 07 00:40:09 1999
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While you're here, how about checking out the
Astronomy Book
List ? |
>When I fried my scope RS232 circuit, I made up a power strip box and
>the power strip. I measured about 50 VAC. This is what fried my RS232 chip.
>When I plugged the grounding strap between the Toshiba ground and the power
>strip Earth ground, the AC voltage of course dropped to zero. I tried
This sounds like the common problem when power supply pulse filters on
computer power supplies are not grounded.Capacitors across the mains supply
split the supply into half if they are not grounded .That would explain the
50 volts or so in the USA.In Uk it would be 120v as our mains power supply
is twice yours. Thew capacitors limit the amount of current to a few milli
amps but that is enough to destroy chips.
Brandon S. Jones
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