Basic stamp & wall wort''s
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Posts: 46,084
As there have been few replies,
I looked into the issue of frying-stamps as I'm using
one in an autootive environment where higher voltage
transitions may occur if regulator fails, HT noise etc
etc. It appeared to me that MOVs were a possible
solution. At a given voltage they become open circuit
and will pass a substantial current for a short time.
From the data sheet you need to choose one that is
closed at the normal voltage but opens at a voltage
above normal but below the STAMP regulator failure
voltage - using an external linear regulator might
give more latitude here.I understand that a MOV alone
will suppress a tranisent and suspect that they will
survive long enough to blow a quick-blow fuse in
series with PSU.
Adrian
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I looked into the issue of frying-stamps as I'm using
one in an autootive environment where higher voltage
transitions may occur if regulator fails, HT noise etc
etc. It appeared to me that MOVs were a possible
solution. At a given voltage they become open circuit
and will pass a substantial current for a short time.
From the data sheet you need to choose one that is
closed at the normal voltage but opens at a voltage
above normal but below the STAMP regulator failure
voltage - using an external linear regulator might
give more latitude here.I understand that a MOV alone
will suppress a tranisent and suspect that they will
survive long enough to blow a quick-blow fuse in
series with PSU.
Adrian
=====
-
*********************************************
________________________________________________________________________
Yahoo! Messenger - Communicate instantly..."Ping"
your friends today! Download Messenger Now
http://uk.messenger.yahoo.com/download/index.html