I got a bag of these in a box lot of "amplifier parts" on eBay. What are they? The only measurement I can get with my meter is 10M ohms...
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\$\begingroup\$ No markings or writing on the component? \$\endgroup\$– Jakob HalskovApr 8, 2020 at 5:11
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\$\begingroup\$ None just the orange dot on each. \$\endgroup\$– Clark LeachApr 8, 2020 at 22:57
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2 Answers
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It appears to be a fried Metal Oxide Varistor or Thermistor.
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\$\begingroup\$ MOV sounds right. Never installed, so not fried. But I believe they have a shelf life. \$\endgroup\$ Apr 8, 2020 at 5:48
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\$\begingroup\$ It appears so! The original colour may have been orange. Shelf life is not an issue. Degradation occurs only due to voltage spikes encountered in operation. \$\endgroup\$– vu2nanApr 8, 2020 at 6:27
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As vu2nan says it is most likely a MOV (metal oxide varistor) which will have a high resistance until a large voltage is applied across it.
The exact voltage is hard to tell without a power supply that can generate a sufficient voltage; possibly above 200-300 volts, as it is often used to protect the input of AC line circuits.
Read more here: https://en.m.wikipedia.org/wiki/Varistor
