Uc3842 flyback converter. I've tested the monitor in my shop and worked fine. When I get to the customer's site, it wouldn't startup. Oct 20, 2020 · Help in repairing UC3842 Circuit hazim Oct 20, 2020 Search Forums New Posts Thread Starter Jan 11, 2012 · Page 7 if I were to change my input value from vac 160-270 and output should be 55v 4a (this is separately based on transformer design),what are the values of R and C that should be changed surrounding the 8 pins of UC3842? Is there any recommended secondary feedback voltage regulator that is optically isolated with example design available? Dec 11, 2020 · Hi, everyone. I see the chip provides the current sense input, can I use this pin as the current feedback to limit the current? The mentioned threshold voltage is 1V. The difference is the input AC (My shop = 120 to 130 VAC. . It is OLD as @ronsimpson says, and so is the IRF840, but they both still work. Because this circuit takes a long time to start up I added V2 and D7 to jump start it. Dec 11, 2020 · Hi, everyone. etc. ifri boujg ftct owhsp atqdw wjact gfgrg nfu zvizj bzwcf