1N34A or NOT 1N34A ???

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  • Опубликовано: 5 фев 2020
  • Short video about problems with mislabeled components.
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Комментарии • 27

  • @robertneill3057
    @robertneill3057 Год назад +2

    The genuine Ge diodes do have a slightly longer glass package that is either clear or darkened. The point contact can be made out by viewing in clear light.

  • @kensmith5694
    @kensmith5694 Год назад +1

    It is the diodes capacitance that is likely the problem with the "alternative" diodes. The smaller output suggests that they are not rectifying well.

  • @Backtothefutureradios
    @Backtothefutureradios 4 года назад +1

    Great analysis Bob! Thanks for posting this!!! Take Care--Larry

  • @old64goat
    @old64goat 4 года назад +2

    That is good to know, Thanks for the info Bob.

  • @tinkeringwithelectronics
    @tinkeringwithelectronics 3 года назад +1

    Thanks Bob, Don forwarded this to me. I've been noting my diodes don't perform consistently in my project. That is some do, some don't. We need a "magic box" that will identify diodes!!

    • @YouAllKnowBob
      @YouAllKnowBob  3 года назад

      Check out this video. ruclips.net/video/Lyos1D7_2OI/видео.html

  • @georgeallen8860
    @georgeallen8860 Год назад +2

    i was caught too

  • @grzesiek1x
    @grzesiek1x Год назад +2

    This is probably the reason why people get in trouble with all kinds of radio receivers etc. (including myself) as a lot of Germanium diodes etc. are not produced any more as it was there is only one supply ... China and it is where problems start! I have wasted so much time with some fake products so now I don't care if a product from AliExpress doesn't meet specifications I just ask for refund straight away. I hope everybody does it so it will teach a lesson to those scummers.

  • @marcdraco2189
    @marcdraco2189 2 года назад

    Well what d'ya know! I was sold 1N34As just like those. As it happens, I hadn't used them in a proper circuit yet and just dug them out of the spares box to test an in-circuit tester I'm developing (it works without a scope) but sure enough that looks just like waveform you were getting on a low-voltage, low frequency sweep. So I guess I'll put them back as Schottkys! Cheers Robert, brilliant analysis.

  • @percaine
    @percaine 3 года назад +3

    I had the same problem when i was looking for germanium diodes recently..Most of the cheaper options seem to be the "fake" 1N34N and the real thing is way over priced.

    • @YouAllKnowBob
      @YouAllKnowBob  3 года назад +1

      Just one of the problems when we are still using through hole components.☹️

    • @Marksracingengines
      @Marksracingengines 3 года назад +3

      same here. bought 100 of them off ebay for crystal radio kits for some students...fail

  • @wildonpriddy1800
    @wildonpriddy1800 4 года назад +1

    Thanks bob good to know

  • @akepatinagaraju8564
    @akepatinagaraju8564 2 года назад

    👍👍👍👍👍

  • @davidfalconer8913
    @davidfalconer8913 5 месяцев назад

    Recommend an OA79 or even an OA81 ( 1st class for any crystal radio ! ) .. ( tried - n - tested ) .. DAVE™🛑

  • @arthurharrison1345
    @arthurharrison1345 3 года назад +1

    How can a germanium diode have a forward voltage drop of 2.8 to 2.9 volts at any reasonable current?

    • @YouAllKnowBob
      @YouAllKnowBob  3 года назад +1

      Germanium diodes are used in low voltage, low current circuits. Most are point contact with a very fine wire connecting the germanium to the circuit. The low forward voltage makes them ideal as detectors.

    • @analog_guy
      @analog_guy 6 месяцев назад +1

      He possibly meant to say .28 to .29 volts.

    • @SeekingTheLoveThatGodMeans7648
      @SeekingTheLoveThatGodMeans7648 3 месяца назад

      @@analog_guy and if so, the answer is because it is not silicon

  • @SaulMonteiroYoutube
    @SaulMonteiroYoutube Год назад

    this news 1m34 need to be feed with 1 or 2v to work fine. Use a 1.5v batt to polarize that one...

  • @akepatinagaraju8564
    @akepatinagaraju8564 2 года назад

    Sir ssb bluener about plz

  • @RestoreOldRadios
    @RestoreOldRadios 4 года назад +2

    Bob - Lots of fakes for sure. I’ve always purchased my diodes from: www.mikeselectronicparts.com/product/1n34a/ They have always been a dependable supplier. All the best. Don

  • @W4BIN
    @W4BIN 2 месяца назад

    In my experiences any Schottky diode is superior to every germanium diode ever made in every way, even a one ampere power Schottky diode is superior to a 1N34A with respect to speed capacity, frequency operation, power drop across the diode and anything else that I can think of. There must be something wrong with these tests. Ron W4BIN