W
Watson A.Name - \"Watt Su
Guest
I've been scrounging a few parts from old defunct AT SMPSes, and I found
a few that have these Maida Z151-03UL transient voltage suppressor MOVs,
one across each of the 470uF, 200V filter caps. I found the specs here:
http://www.maida.com/content/products/varistors/standard/fullRecord.asp?
iACVolts=150&iDCVolts=0&iDiskSize=0&stylenum=D73ZOV151RA03
Only a few of the PSes have them. Each of the MOVs, or is it TVSs, has
a plastic sleeve slipped over it, and the top half is filled with white
goop, looks like silicone grease, but hard like caulking compound.
The last MOV that failed on me failed violently, big BRRRZAP! and flash
of light, and it filled the power strip with soot and smoke. It seems
to me that putting a plastic sleeve over one of these is like adding
kindling to a fire. The white goop may be silicone and fire resistant,
but the clear plastic sleeve doesn't look flameproof. I'm gonna take
one outside later this morning and apply a propane torch to it to see
how flameproof it is.
My thinking is that if an excessive voltage is applied to a big
electrolytic, it will start conducting like a resistance, and if the
product of the power and time is great enough it will overheat, and if
it gets hot enough it will vent electrolyte. But it's much bigger than
the TVS, and it should be able to handle more overvoltage/overcurrent
than one of these little 8 mm MOVs.
--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
a few that have these Maida Z151-03UL transient voltage suppressor MOVs,
one across each of the 470uF, 200V filter caps. I found the specs here:
http://www.maida.com/content/products/varistors/standard/fullRecord.asp?
iACVolts=150&iDCVolts=0&iDiskSize=0&stylenum=D73ZOV151RA03
Only a few of the PSes have them. Each of the MOVs, or is it TVSs, has
a plastic sleeve slipped over it, and the top half is filled with white
goop, looks like silicone grease, but hard like caulking compound.
The last MOV that failed on me failed violently, big BRRRZAP! and flash
of light, and it filled the power strip with soot and smoke. It seems
to me that putting a plastic sleeve over one of these is like adding
kindling to a fire. The white goop may be silicone and fire resistant,
but the clear plastic sleeve doesn't look flameproof. I'm gonna take
one outside later this morning and apply a propane torch to it to see
how flameproof it is.
My thinking is that if an excessive voltage is applied to a big
electrolytic, it will start conducting like a resistance, and if the
product of the power and time is great enough it will overheat, and if
it gets hot enough it will vent electrolyte. But it's much bigger than
the TVS, and it should be able to handle more overvoltage/overcurrent
than one of these little 8 mm MOVs.
--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@