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Question about LM317
IMPORTANT!   I made a huge mistake in the drawing of post #23. Please forgive me and disregard that drawing.   The correct one is this one, below. Grateful.  
Monday, 17 January 2022 - 00:43
Question about LM317
avrcandies wrote: With 1k on the base & 5V & vbe drop, you are Ok for the source spec of 4ma (you are not using sinking at all).   Your post reassured me,...
Sunday, 16 January 2022 - 23:28
Question about LM317
Who-me wrote: rmlazzari wrote: I'd like to add the 5mm LDR at the top of that box.   Keep in mind LDRs are inverse log response, so a smooth linear action will be hard to...
Sunday, 16 January 2022 - 21:23
Question about LM317
They say that a picture is worth a thousand words. Well... sorry for the slightly blurry images, a new cell phone is about to arrive.   Here's the lamp. The LED that shines...
Saturday, 15 January 2022 - 01:34
Question about LM317
avrcandies wrote: Use a photodiode instead  (more sensed light---> more photodiode diode current)   I didn't know that device. I'd like to use what I have here, in...
Friday, 14 January 2022 - 23:59
Question about LM317
avrcandies wrote: Are you talking about a 500ma or 1 amp led?   Or a 4 ma led?   We are talking about a red led, 20mA, 2.2v dropout, very common, and that, if the...
Friday, 14 January 2022 - 23:49
Question about LM317
grohote wrote: rmlazzari wrote: wish to set 317 using variable resistors (like LDR ou thermistor).   You can use Thermistor as R2 in #4 picture. As for LDR, you can try with...
Friday, 14 January 2022 - 17:29
Question about LM317
The datasheet recommends to use a variable resistor as R2. It means as greater is that resistance R2, greater is Vout. I'd like the opposite: greater resistance, less output...
Friday, 14 January 2022 - 17:07
Question about LM317
Thank you, everybody!
Friday, 14 January 2022 - 16:34