Products > Test Equipment

Seriously, what is the value of a $30 thing that is unreliable?

<< < (3/6) > >>

madires:
Because the n-ch JFETs you buy via eBay or AliExpress often turn out to be jellybean NPNs. Or you wonder why the replacement MOSFETs for the SMPSU you're repairing blow up the second time (they are counterfeits).

axantas:

--- Quote from: temperance on August 28, 2024, 04:18:12 pm ---I wonder why you need to verify component with curve tracers and transistor testers?

--- End quote ---

Because we can and we have a collection of these "things", which is to be used  :bullshit: :popcorn:

AVGresponding:

--- Quote from: temperance on August 28, 2024, 04:18:12 pm ---I wonder why you need to verify component with curve tracers and transistor testers?

--- End quote ---


You don't always, it's entirely dependent on your use case.

If you want a couple of transistors to turn on some relays, all you need to know is if they can handle the voltage and current in general terms.
If you want a couple of transistors for matched input stages (for anything that might need such things) you're probably going to want to check very carefully that they match in a number of characteristics, in which case a curve trace becomes useful.

The point about caps being tested for leakage current at 400V is again, use case oriented. You only really need to do this if you're going to be using them at that voltage.

temperance:

--- Quote ---Because the n-ch JFETs you buy via eBay or AliExpress often turn out to be jellybean NPNs. Or you wonder why the replacement MOSFETs for the SMPSU you're repairing blow up the second time (they are counterfeits).
--- End quote ---

Interesting. So you spend $30 on some test equipment to verify to cheap junk you obtain from whichever place.

KungFuJosh:

--- Quote from: temperance on August 28, 2024, 05:57:19 pm ---Interesting. So you spend $30 on some test equipment to verify to cheap junk you obtain from whichever place.

--- End quote ---

As opposed to what? The exceptionally expensive test equipment we also use to very the expensive components we also purchase?

I use the transistor testers to make sure the parts I get from Mouser are functional, and sometimes I check to see if values are close for matching. If the test results are repeatable, that's usually useful.

If you know of a significantly better transistor tester that doesn't cost $50,000 and isn't the size of a 1980s computer, I'd love to check it out. 🤷

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