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enter image description here

It's a resistor like coloured 2 pin component from a power supply board of a home theatre, with a glass-transparent aspect. I'm a hobbyist and not into complex circuit till now... looking for an answer online but couldn't find anything.

Thanks

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Is this what you mean?

Is this what you mean?

Google says YP-501M is surge absorber. You can read from the link below for reference. http://www.mmc.co.jp/adv/dev/english/document/surge_absober/surgeabsober04.html

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Thanks everybody, turns out it is a DIAC, Diode for alternating current. That's why it is so hard to test on a multimeter, its only works after a specific voltage break point.

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  • \$\begingroup\$ I am curious about the mismatch between the function and the part number. How did you determine it was a DIAC? \$\endgroup\$
    – user133493
    Nov 9 '18 at 11:38
  • \$\begingroup\$ No, it isn't a DIAC, although it has similar electrical characteristics. \$\endgroup\$
    – Dave Tweed
    Nov 9 '18 at 12:01
  • \$\begingroup\$ This is not a DIAC. It's a spark gap. \$\endgroup\$
    – Hearth
    Nov 9 '18 at 12:31
  • \$\begingroup\$ Looks like spark gaps and DIACS did behave as the same when tested. So, in fact it is not a DIAC, i agree. Until now I had not seen spark gaps on circuits. I assume DIAC because of the infinte resistance on multimeter and similarity of the symbols. I think the question is pretty much answered, i'm after the new part now. Thx \$\endgroup\$
    – Chemist
    Nov 9 '18 at 18:51
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those Two Diodes(https://en.wikipedia.org/wiki/Diode) are impacting each other.

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    \$\begingroup\$ This is not a very helpful answer, please improve it. \$\endgroup\$
    – Manu3l0us
    Nov 9 '18 at 7:49
  • \$\begingroup\$ This answer is not correct. \$\endgroup\$
    – Dave Tweed
    Nov 9 '18 at 12:00

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