Electronics > Projects, Designs, and Technical Stuff
How to test 2N6027 (SILICON PROGRAMMABLE UNIJUNCTION)
sdancer75:
GM328 recognized this as a thyristor. I will give it some tests to verify this.
EDITED: Yep, it works like a normal thyristor.
I connected the Anode to meter red lead, Cathode to black lead, and set meter to diode test. Then I shorted the gate to Anode instantly, and the meter showed 0.7V just like a thyristor.
Ian.M:
That explains why the PUJT test circuit wont work. A small SCR (thyristor) can act as an 'inverted' PUJT: Turn the whole test circuit upside down, keeping the positive supply at the top, (and also keep the LED with the correct polarity), and hook up the fake '2N6027' using the pinout from your tester, cathode to where the test circuit anode was and visa versa.
sdancer75:
--- Quote from: Ian.M on June 16, 2020, 03:50:44 pm ---That explains why the PUJT test circuit wont work. A small SCR (thyristor) can act as an 'inverted' PUJT: Turn the whole test circuit upside down, keeping the positive supply at the top, (and also keep the LED with the correct polarity), and hook up the fake '2N6027' using the pinout from your tester, cathode to where the test circuit anode was and vis versa.
--- End quote ---
Thanks, Ian for your time.
I lost my time with this....
I bought them, just to play, nothing important or a repair job, but I couldn't leave it before I get a serious explanation of what's wrong with this thing.
Best Regards,
madires:
The GM328's firmware (most likely a k-firmware) doesn't seem to have the PUT check enabled, but the OSHW firmwares (k and m-firmware) both support PUTs. For the k-firmware uncomment WITH_PUT in the Makefile.
sdancer75:
--- Quote from: madires on June 16, 2020, 03:58:49 pm ---The GM328's firmware (most likely a k-firmware) doesn't seem to have the PUT check enabled, but the OSHW firmwares (k and m-firmware) both support PUTs. For the k-firmware uncomment WITH_PUT in the Makefile.
--- End quote ---
Thanks,
Yes, I have the k-firmware (all other firmwares I uploaded, were not compatible with this PCB) but in this specific case, it seems that GM328 was correct. The PUT was actually a thyristor.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version