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Old 9th Sep 2019, 6:36 pm   #47
ajgriff
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Join Date: May 2004
Location: Halifax, West Yorkshire, UK.
Posts: 2,587
Default Re: Defective/ fake LM317T

Quote:
Originally Posted by Jolly 7 View Post
The aim of mounting the pot the way I did was to make it panel mountable and make the entire unit fit in a case. I would not have been able to do that with the supplied blue pot with a tiny screw for voltage adjustment. In relation to the wiring of the pot, the PCB already came with a tracing linking the wiper to one end of the track.
I selected a 22K panel mountable pot because I have no more 10K ones, at least for now. I also suspect my 10K pot may have been burnt by the IC, because it was reading in the megaohm range when I tested it after desoldering.
I fully appreciate why you ultimately wish to use a different pot rather than the original trimmer. However, I was trying to understand the odd behaviour described in your post #20 (third quote in my earlier post). It still appears to me that your flying pots were incorrectly wired and I can see no reason to change that view. I may be completely mistaken of course.

Alan
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