2 ways to test germanium diodes 1N34A 1N60 for real vs fake Schottky counterfeits

2 ways to test germanium diodes 1N34A 1N60 for real vs fake Schottky counterfeits
- 1 Use a cheap component tester.
Real Ge diodes read Vf in the 200's mV and uA leakage.
Fake Ge diodes read Vf in the 300's mV and nA leakage. Most testers will also give a capacitance reading, whereas real Ge diodes will not show capacitance on these component testers.
- 2 Pass a sine wave through the diode.
Real Ge diode passes a nice looking sine wave.
Fake Ge diode passes a very distorted wave.

[@mp-ov9dh]

great info, I knew there are chinese fake parts but didnt look into how to distinguish between the good ones and the crap. now i can test my own parts Thank you!

[@ingussilins6330]

I think - DC biased silicon transistor as a AM demodulator, or silicon diode, LED with DC bias work better than germanium diode.

[@kensmith5694]

There are better options if you are going to use a transistor.
Schottky diodes work better in general with the right loading resistor
ruclips.net/video/5y7I7G_a3Qo/видео.htmlsi=de22ziEPiY3x9r67
If you want to bias a diode, biasing a schottky is a good way to go

[@cb24203]

I have some germanium D9K diodes that measure around 180-200mv. Is there anything to worry about if the reading is below 200?

[@bigslick]

no, lower is better for germanium diode

[@cb24203]

​​@@bigslick I also have some that show leakage but are around 500mv in the TC-1 tester and my dca-75 but on the multimeter read around 300mv . They're Russian D9v. Is this because of the test voltage?

[@keithking1985]

Chinese stuff is always made the cheapest way possible..