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    #1

    SG - what does it stand for?

    I found some metal components inside glass, labeled "SG" on PCB from old display, what's that?
    Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

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    #2
    Re: SG - what does it stand for?

    spark gap.

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      #3
      Re: SG - what does it stand for?

      Another interesting component labeled PTCU. There are two coin-like pieces of metal inside...

      What's that?
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        #4
        Re: SG - what does it stand for?

        Photon Torpedo Control Unit #1

        There are two of them in any StarFleet Attack Runabouts.

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          #5
          Re: SG - what does it stand for?

          Malmal's answer is funny, but not quite correct, electronically speaking. The component you have is a positive temperature coefficient resistor/thermistor unit, and these are used for current limiting tasks.

          Huck

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            #6
            Re: SG - what does it stand for?

            I liked malmal's answer better...

            I have them in my runabout...
            veritas odium parit

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              #7
              Re: SG - what does it stand for?

              lol
              it's called a ptc, it's used to power the degausing coil for a few seconds at power up.
              after a few seconds the thing is so hot that the resistance increases & cuts power to the coil.

              heres a tip - they do fail.
              if you desolder one and it rattles - it's fucked.

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                #8
                Re: SG - what does it stand for?

                It's supposed to have a cover.

                Mann-Made Global Warming.
                - We should be more concerned about the Intellectual Climate.
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                Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                - Dr Seuss
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                You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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                  #9
                  Re: SG - what does it stand for?

                  Sometimes, spark gaps (SG) are called air gaps (AG).
                  Some may exist as exposed PCB traces.
                  My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

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                    #10
                    Re: SG - what does it stand for?

                    Originally posted by PCBONEZ View Post
                    It's supposed to have a cover.
                    Yeah I have it somewhere...

                    Thanks for the answers...
                    Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

                    Exclusive caps, meters and more!
                    Hardware Insights - power supply reviews and more!

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