Surface mount spark gap?

N

N_Cook

Guest
1206 footprint inside a Chinese in-line smps. Amber colour showing an
underlying zigzag track like pcb trace inductor and a tiny fuzzy bit. In
series with 15K , only, and going between the coldside pre-rectifier hf ac
and the 48V dc output . Does not measure 0 ohm, not a fuse in that
situation. Overlay marked ED201 , ED = electrostatic discharge? Note, its on
the cold side. "surface mount" "spark gap" in goomages threw up nothing
Bad solder joint on the v reg should be the problem but just wanted to check
what this new-to-me device might be. Case cracked open painlessly
 
N_Cook <diverse@tcp.co.uk> wrote in message
news:i3ej86$er3$1@news.eternal-september.org...
1206 footprint inside a Chinese in-line smps. Amber colour showing an
underlying zigzag track like pcb trace inductor and a tiny fuzzy bit. In
series with 15K , only, and going between the coldside pre-rectifier hf
ac
and the 48V dc output . Does not measure 0 ohm, not a fuse in that
situation. Overlay marked ED201 , ED = electrostatic discharge? Note, its
on
the cold side. "surface mount" "spark gap" in goomages threw up nothing
Bad solder joint on the v reg should be the problem but just wanted to
check
what this new-to-me device might be. Case cracked open painlessly
Click to expand...
looking under x30 it has a gold coloured if not gold plated surface with a
bit of ptrofiling, perhaps hiding another surface under as seems continuous
metalling from land to land, with a tiny brown dot in the middle and clear
plastic cover over
 
What a plonker. Now it is knocking out 48V DC, its function is obvious. It
would have been much more obvious if it was not at the edge of the board
with the L missing off the overlay designation ED201, and a more obvious
window in the casing.
 
On 06/08/2010 17:16, N_Cook wrote:
What a plonker. Now it is knocking out 48V DC, its function is obvious. It
would have been much more obvious if it was not at the edge of the board
with the L missing off the overlay designation ED201, and a more obvious
window in the casing.
Click to expand...
A photon gap then?

:)

--
Adrian C
 
Adrian C <email@here.invalid> wrote in message
news:8c2vjrF4q5U1@mid.individual.net...
On 06/08/2010 17:16, N_Cook wrote:
What a plonker. Now it is knocking out 48V DC, its function is obvious.
It
would have been much more obvious if it was not at the edge of the board
with the L missing off the overlay designation ED201, and a more obvious
window in the casing.

A photon gap then?

:)

--
Adrian C
Click to expand...

I did discover that there are such things as SM gas discharge
tubes/arresters
 
On Aug 7, 12:37 am, "N_Cook" <dive...@tcp.co.uk> wrote:
Adrian C <em...@here.invalid> wrote in message

news:8c2vjrF4q5U1@mid.individual.net...

On 06/08/2010 17:16, N_Cook wrote:
What a plonker. Now it is knocking out 48V DC, its function is obvious.
It
would have been much more obvious if it was not at the edge of the board
with the L missing off the overlay designation ED201, and a more obvious
window in the casing.

A photon gap then?

:)

--
Adrian C

I did discover that there are such things as SM gas discharge
tubes/arresters
Click to expand...
One time we used a series of gas tube spark gaps for protecting the
circuitry, but could not figure out why they weren't meeting spec and
firing closer to 400 V than over 600, until...some enlightened person
suggested that maybe it was because we stuck them inside a dark oil
tank and there was no light! yes, that was it. Later we noticed the
problem went away when the gas was somehow 'pretriggered'. and didn't
matter whether in light or dark. Radioactive isotope doping?
 
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