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Related

Hey, Guys, I'm stumped It

phoenixcomm
phoenixcomm over 2 years ago

imageOk, it claims to be a 0.22Ω 3watt power sand resistor, with 3 legs. (so starting at the top and going clockwise, 1 at the top, 2 on the right, and 3 on the left)

My fluke 113 says no it's 0.38Ω between 1 and 2, as well as between 1 and 3, and 0.59/0.60Ω between 2 and 3. 

My HP3435A  set on the 20Ω scale says it's 0.37Ω between 1 and 2, and 0.38Ω between 1 and 3, and 0.59Ω/0.60Ω between 2 and 3.

Something is not right. 

and Please look at the logo, so I can figure out who made the stupid thing..

oh btw the wires go all the way through the body and are about 1" long on the reverse side. 

Thanks again. Cris

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Top Replies

  • jc2048
    jc2048 over 2 years ago +5
    As you've got two meters, perhaps just do your own four-wire measurement. Set a PSU to constant-current, use one of your meters to measure the current through the resistor, the other to measure the voltage…
  • beacon_dave
    beacon_dave over 2 years ago in reply to jc2048 +5
    Push pull amplifier designs appear to use them. Here is a Sony receiver design using a similar device. https://www.petervis.com/Amplifiers/sony-str-k740p/how-to-fix-sony-amplifier-protect-mode-error…
  • michaelkellett
    michaelkellett over 2 years ago +4
    Just guessing but: lets assume your leads have about .15 ohm resistance. then its a 0.22 R from 1 to 2, a second 0.22R from 1 to 3 (they both read about 0.37) so from 2 to 3 its 0.44R + the lead reistance…
Parents
  • scottiebabe
    scottiebabe over 2 years ago

    Any clues what kind of circuit this resistor was used in?

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  • jc2048
    jc2048 over 2 years ago in reply to scottiebabe

    I'm curious too. Why three pins and how is it supported physically?

    It will relate in some way to an aircraft cockpit, so maybe something to do with indicator bulbs? In-rush limiting? Lower intensity for night-time use?

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  • beacon_dave
    beacon_dave over 2 years ago in reply to jc2048

    Push pull amplifier designs appear to use them. Here is a Sony receiver design using a similar device. 

    imageimage

    https://www.petervis.com/Amplifiers/sony-str-k740p/how-to-fix-sony-amplifier-protect-mode-error.html

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  • scottiebabe
    scottiebabe over 2 years ago in reply to beacon_dave

    That is one plausible application! I was curious why the pins went all the way through the cermet package. In this case it would may it would be easy to adjust the quiescent current in a class-ab output stage. Just clip a DMM to those pins to measures the voltage drop across the emitter ballast resistors...

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  • beacon_dave
    beacon_dave over 2 years ago in reply to scottiebabe

    You have got to keep your 78 records sounding at their best in the cockpit on those long haul flights... Slight smile

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  • beacon_dave
    beacon_dave over 2 years ago in reply to scottiebabe

    You have got to keep your 78 records sounding at their best in the cockpit on those long haul flights... Slight smile

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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to beacon_dave

    techmoan posted a video a few days ago, on his reasonable budget attempt to show that 78 records actually sounded good in their time:

    You don't have permission to edit metadata of this video.
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    Upload Preview
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