On Tuesday 19 June 2007 20:57, Rony wrote:
> Hello All,
>
> The rains have hardly begun and my client's mobo was its first
> casualty. Its on-board LAN got zapped by lightning through the
> cable internet while the pc was off. Is there any small handy LAN
> lightning protector that can be given to all clients with cable
> internet? Has anyone used such a thing?
Use a lan card for internet. your mobo is going to fry not by
lightining but by electricity leakages due to moisture and capillary
action inside the cable.
A propah lightning arrestor requires a gas filled discharge tube with
low inductance leads and a fuse. It costs about Rs.150/-. You can
build one by using a neon lamp (the tiny ones in a tester or jewel
lights), two 1n4001 diodes connected back to back (or better still
7.1v zeners) and a 500ma fuse . you will require one such circuit for
each wire in the cable. Connect the diodes back to back in series.
connect the neon lamp across the diodes. connect one end of this
combi to the fuse and the other to earth (That is the mains earth)
wire in--fuse--+--wireout
wireout -->|----|<--- +---earth
wireout --| neon lamp |---earth
Hope the ascii art is ok.
The chances of saving equipment is quite slim when lightning strikes
even with the circuit but it will sure save your house from going up
in flames while you are goofing off in office.
My friends pc was fried by tatainidicom string cable across mseb
wires, which made contact with the live wires and burnt everything to
crispy. Lucky nobody was using the comp or sitting with headphones
plastered to his skull.
--
Rgds
JTD
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