| Products > Test Equipment |
| Seriously, what is the value of a $30 thing that is unreliable? |
| << < (5/6) > >> |
| KungFuJosh:
--- Quote from: temperance on August 28, 2024, 11:02:42 pm --- --- Quote ---You're joking? I build some complex enough products and I don't want to guess if there's an issue. Every single component gets tested before install. --- End quote --- I find it hard to believe you will be using a $30 transistor tester powered with two AA batteries to verify component performance. Because that's what this topic is about. --- End quote --- Believe whatever you like, but I only check transistors with the devices this thread is about. I don't go through 90k parts a month, so it's not a big deal for me. What I do is on a smaller scale, so failures are a larger problem. |
| thm_w:
--- Quote from: KungFuJosh on August 28, 2024, 10:42:21 pm ---You're joking? I build some complex enough products and I don't want to guess if there's an issue. Every single component gets tested before install. Every single time. And yes, I have found failures that saved me a lot of frustration. Sometimes thanks to a DMM or LCR, and sometimes thanks to these cheap transistor testers. --- End quote --- So you've had multiple failed transistors from a major distributor? Not something I've ever heard of before. |
| KungFuJosh:
--- Quote from: thm_w on August 29, 2024, 12:24:50 am ---So you've had multiple failed transistors from a major distributor? Not something I've ever heard of before. --- End quote --- I've been in business for 30 years. Yes, I've had multiple failed transistors over the years. I'm surprised anybody is surprised by this. I'm in the guitar business, even the bigger distributors aren't always that big, and who knows where they get their inventory from. Probably more relevant is that some devices call for vintage transistors, and that should speak for itself when it comes to testing before using. |
| porter:
Markus Frejek, the inventor (I think) of these types of devices introduced the tester this way: --- Quote ---Every hobbyist knows well the problem: one builds a transistor made from a single device, or extracting one from the junk box. If the type designation can be seen (and known one is), everything is fine. Often, however, this is not so, and then the usual times goes off again: type and pinout of the transistor from the Internet or a book out looking. It's annoying in the long run of course pretty. Also transistors in the same housing do not always have the same pin assignment. For example a 2N5551 has a different assignment as a BC547, although both have a TO92 housing. If in a transistor, the term is no longer visible (or not even Google knows what to do so), it is with conventional methods really complicated to figure out the types of transistors: it could be to NPN, PNP, N or PĀchannel Mosfet acting etc.. Possibly the component also has a protection diode internally. This makes the identification more difficult. By trial and error by hand is thus a rather timeĀ consuming task. Why not let do it by microcontroller that? So this automatic transistor tester has arisen. --- End quote --- Is this an entirely new type of instrument? |
| Fungus:
Their original purpose of these was a component identifier. The fact that they have to do a few basic tests on a component to figure out what it is was secondary. Now people expect a $30 gadget to do the job of an LCR meter and curve tracer? :-// |
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