Are These Germanium Diodes?

Discussion in 'General Electronics Chat' started by Simmo, May 28, 2015.

  1. Simmo

    Thread Starter New Member

    May 27, 2015
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    Hey guys, are these Germanium diodes? And why does one have 744 stamped on it and the other 754? Also, what kind of diode is the one at the bottom with the yellow line on it? Thanks a lot!

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  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    planeguy67 likes this.
  3. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    1N4744 is a 15V Silicon Zener diode.
    1N4754 is a 39V Silicon Zener diode.
     
  4. Simmo

    Thread Starter New Member

    May 27, 2015
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    Wow quick replies! Thanks so much guys.

    I'm trying to salvage some Germaniums, what would be best to rip apart to find some? A radio? Would a 2-way, 40 channel walkie talkie contain any?
     
  5. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Old Radios may be.
     
  6. DickCappels

    Moderator

    Aug 21, 2008
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    Look for things made before about 1965. I was able to pull some off of logic boards made in the early 1960's.
     
  7. alfacliff

    Well-Known Member

    Dec 13, 2013
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    when unsoldering, be careful and quick, germanium diodes have lower temprature tolerance than silicon.
     
  8. shortbus

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    Sep 30, 2009
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  9. Simmo

    Thread Starter New Member

    May 27, 2015
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    Went ahead and grabbed some off eBay, can't really go wrong with $1.29 free shipping, I don't come across any 1960's electronics in my area anyway. Thanks guys appreciate it.
     
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