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Surface mount spark gap?

Discussion in 'Electronic Repair' started by N_Cook, Aug 5, 2010.

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  1. N_Cook

    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
     
  2. N_Cook

    N_Cook Guest

    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
     
  3. N_Cook

    N_Cook Guest

    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.
     
  4. Adrian C

    Adrian C Guest

    A photon gap then?

    :)
     
  5. N_Cook

    N_Cook Guest


    I did discover that there are such things as SM gas discharge
    tubes/arresters
     
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