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.
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!!
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.
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.
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.
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.
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
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
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.
It is the diodes capacitance that is likely the problem with the "alternative" diodes. The smaller output suggests that they are not rectifying well.
Great analysis Bob! Thanks for posting this!!! Take Care--Larry
Thanks Larry!
That is good to know, Thanks for the info Bob.
Thanks Bill!
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!!
Check out this video. ruclips.net/video/Lyos1D7_2OI/видео.html
i was caught too
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.
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.
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.
Just one of the problems when we are still using through hole components.☹️
same here. bought 100 of them off ebay for crystal radio kits for some students...fail
Thanks bob good to know
👍👍👍👍👍
Recommend an OA79 or even an OA81 ( 1st class for any crystal radio ! ) .. ( tried - n - tested ) .. DAVE™🛑
How can a germanium diode have a forward voltage drop of 2.8 to 2.9 volts at any reasonable current?
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.
He possibly meant to say .28 to .29 volts.
@@analog_guy and if so, the answer is because it is not silicon
this news 1m34 need to be feed with 1 or 2v to work fine. Use a 1.5v batt to polarize that one...
Sir ssb bluener about plz
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
Thanks Don!
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