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What is quality level and reliability of cheap chinese diodes?

russwr

Dec 20, 2019
15
Joined
Dec 20, 2019
Messages
15
My China purchased diodes (FR607) may not be responding to the high frequencies, while trying to measure DC volts on high frequency analog multimeter. Should I change these to US made diodes of tr fast recovery in nanoseconds? Meter not going over 15 volts DC on 20khz circuit. I recently noticed their further selling of 20amp diodes of same shape and size as 6 amp type.
 

Martaine2005

May 12, 2015
4,341
Joined
May 12, 2015
Messages
4,341
Unfortunately, buying anything from China directly as opposed to through a reputable vendor is always risky. Fake components are in the millions.
My advice would be to change the diodes to known good ones and see if your measurements change.


Martin
 

crutschow

May 7, 2021
511
Joined
May 7, 2021
Messages
511
No matter what, you need low current ( a couple hundred mA), fast recovery diodes, (such as Schottky types) to rectify 20kHz signals.
Larger diodes have more junction capacitance which can affect the accuracy of the rectified signal.
 
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