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little help with lm317 wireing

Started by whomeno, May 23, 2020, 11:55:28 AM

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whomeno

May 23, 2020, 11:55:28 AM



What would the 100R trimmer be for?
the 2k pot would be to raise or lower the voltage correct?
on the 2k pot pin  wiring.  lm317 pin 1 to pot lug 2 and ground to pot lug 1 Correct.
I'm working on making a desktop power supply
I want to mount this in a case so I could have 0 to 30 volt
Gear as of now
Gibson 2017 Les Paul Tribute T
Epiphone Les paul Special (upgraded)
Marshall DSL 20 Head
Peavy Valve king 20 W
2 X 12 Cabinet with celestion vintage 30 & celestion G12T-75
And a lot of pedals

antonis

#1
May 23, 2020, 04:38:37 PM
100R trimmer is for ultra perfectionists..
(it acts on the reverse mode of 2k one)

You mau safely ignore it and substitute it & 120R resistor with a 220-240 Ω as far as you are OK with 2K trimmer minimum turn accuracy..
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

whomeno

#2
May 23, 2020, 04:46:37 PM
ok Thanks
Gear as of now
Gibson 2017 Les Paul Tribute T
Epiphone Les paul Special (upgraded)
Marshall DSL 20 Head
Peavy Valve king 20 W
2 X 12 Cabinet with celestion vintage 30 & celestion G12T-75
And a lot of pedals

antonis

#3
May 23, 2020, 04:51:33 PM
OK.. Pas de puoi..
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

ElectricDruid

#4
May 23, 2020, 06:10:14 PM
+1 agree, never bothered with it myself.

My bench top pedal supply is based on the LM317 and never had any such niceties. It doesn't miss it.
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