Kari Laine
Guest
Sun Jul 18, 2010 8:38 pm
Hi,
it is the thunder season here in Finland so I got interested how these
surge protectors are built - which say they will save you hardware from
spikes - yeah....
Are there avalanche diodes and coils?
I have a dim feeling I have asked this before...
Best Regards
Kari
--
PIC - ARM - Microcontrollers - I2C - SPI
Keypads - USB-RS232 - USB-I2C - Accessories
http://www.byvac.com
I am just a happy customer
Nobody
Guest
Sun Jul 18, 2010 8:54 pm
On Sun, 18 Jul 2010 22:38:25 +0300, Kari Laine wrote:
Quote:
it is the thunder season here in Finland so I got interested how these
surge protectors are built - which say they will save you hardware from
spikes - yeah....
Are there avalanche diodes and coils?
A voltage-dependent resistor, usually.
John Doe
Guest
Mon Jul 19, 2010 2:22 am
Kari Laine <klaine8_at_gmail.com> wrote:
Quote:
Hi,
Lo
Quote:
it is the thunder season here in Finland so I got interested how
these surge protectors are built - which say they will save you
hardware from spikes - yeah....
High voltage causes a MOV (metal oxide varistor) to close. Both
the input and output points become the same voltage, preventing
current flow through the circuit.
--
Quote:
Are there avalanche diodes and coils?
I have a dim feeling I have asked this before...
Best Regards Kari
Michael A. Terrell
Guest
Mon Jul 19, 2010 4:40 am
Kari Laine wrote:
Quote:
Hi,
it is the thunder season here in Finland so I got interested how these
surge protectors are built - which say they will save you hardware from
spikes - yeah....
You have a season? It's pretty much year round in Florida.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
Phil Allison
Guest
Mon Jul 19, 2010 4:58 am
"John Dope Head "
Quote:
High voltage causes a MOV (metal oxide varistor) to close. Both
the input and output points become the same voltage, preventing
current flow through the circuit.
** More absolute BOLLOCKS from this congenital moron.
Piss this TROLL off !!!!
..... Phil
pimpom
Guest
Mon Jul 19, 2010 6:27 am
Kari Laine wrote:
Quote:
Hi,
it is the thunder season here in Finland so I got interested
how these
surge protectors are built - which say they will save you
hardware
from spikes - yeah....
Are there avalanche diodes and coils?
I have a dim feeling I have asked this before...
A common surge protection device is a Voltage-Dependent Resistor
(VDR), also called a Metal Oxide Varistor (MOV) or simply a
varistor. It acts rather like two zener diodes back to back. It's
placed across the power line and does nothing when the voltage is
within normal limits, passing only a small leakage current. When
the line voltage exceeds a certain limit, the varistor breaks
down and acts as a shunt. It can absorb large amounts of energy
from momentary spikes, but when the high voltage is sustained,
the varistor breaks down permanently. It may burn up or even
explode. Even then, it may have done a useful job by blowing a
fuse.
However, it's a good idea to keep in mind that few, if any,
protection schemes are 100% foolproof. For more details, you may
want to read up on MOVs/VDRs on the net.
John Doe
Guest
Mon Jul 19, 2010 7:16 am
Regular, very active, nym-shifting
"Phil Allison" <phil_a tpg.com.au> wrote:
Quote:
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From: "Phil Allison" <phil_a tpg.com.au
Newsgroups: sci.electronics.basics
Subject: Re: Surge Protector - how they work?
Date: Mon, 19 Jul 2010 13:58:49 +1000
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"John Dope Head "
High voltage causes a MOV (metal oxide varistor) to close. Both
the input and output points become the same voltage, preventing
current flow through the circuit.
** More absolute BOLLOCKS from this congenital moron.
Piss this TROLL off !!!!
.... Phil
Phil Allison
Guest
Mon Jul 19, 2010 12:30 pm
"John Dope Head the Moron "
Quote:
High voltage causes a MOV (metal oxide varistor) to close. Both
the input and output points become the same voltage, preventing
current flow through the circuit.
** More absolute BOLLOCKS from a blatant congenital moron.
Piss this DAMN TROLL right off !!!!
..... Phil
BeeJ
Guest
Fri Jul 23, 2010 4:44 pm
Kari Laine expressed precisely :
Quote:
Hi,
it is the thunder season here in Finland so I got interested how these
surge protectors are built - which say they will save you hardware from
spikes - yeah....
Are there avalanche diodes and coils?
I have a dim feeling I have asked this before...
Best Regards
Kari
Adding to pimpom.
You asked what was in those devices.
You will have to open up one from your locale.
Here in California, we have Radio Shack stores around the corner and my
friend an I were trying to do something similar so we went to Radio
Shack and opened one up.
Inside we found the MOV and a toroid. The toroid may have been wound a
a balun or simply as an inductor. We did not want to cut into it to
see. This also helps reduces spikes coming in. In our case we were
trying to stops spikes going out of an appliance so we added some 500V
ceramic caps (essentially high frequency filters across the line) to
further reduce that noise spectrum that might interfere with X10
devices we have plugged in around the house. We are in test phase now.
Jasen Betts
Guest
Sat Jul 24, 2010 9:06 am
On 2010-07-23, BeeJ <nospam_at_nowhere.com> wrote:
Quote:
Adding to pimpom.
You asked what was in those devices.
You will have to open up one from your locale.
Here in California, we have Radio Shack stores around the corner and my
friend an I were trying to do something similar so we went to Radio
Shack and opened one up.
Inside we found the MOV and a toroid. The toroid may have been wound a
a balun or simply as an inductor.
balun?? probably as a common-mode choke (both windings in parallel)
Quote:
We did not want to cut into it to
see. This also helps reduces spikes coming in. In our case we were
trying to stops spikes going out of an appliance so we added some 500V
ceramic caps (essentially high frequency filters across the line)
You should use X capacitors for cross-line applications
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