| Electronics > Projects, Designs, and Technical Stuff |
| Fake J201 JFETs |
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| fireworks:
--- Quote from: Buriedcode on January 14, 2019, 03:40:57 pm --- --- Quote from: fireworks on January 14, 2019, 12:15:08 pm ---Short the gate to the source. Then measure the resistance between the source and drain in series with a 1kOhm resistor using a basic multimeter. You should read somewhat more than 1kOhm. --- End quote --- Reads ~2.05k with a 1k resistor (which itself read ~985ohm). With a 10k reads: 10.8k either polarity. --- End quote --- Looking at the datasheet from Fairchild, the value of about 1kOhm you get for the drain to source impedance when Vgs=0 is within the specs for the JFet. |
| Zero999:
--- Quote from: Buriedcode on January 14, 2019, 06:04:42 pm --- --- Quote from: Yansi on January 14, 2019, 05:04:35 pm ---Why do people often scream some component is fake, if they just don't understand how it is supposed to work? --- End quote --- Well I didn't "scream it" its why I posted, because I wasn't sure. And I've had plenty of fake (as in re-labeled) parts from fleabay - it's not completely unheard of. Perhaps I should have titled the topic "possible" fake J201's. --- End quote --- A question mark would have done the job and if this were in the beginners section people would've been more lenient too. Have you tried any real J-FET circuits with it yet? |
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