Potentiometer with LM317

I am trying to make an adjustable power supply with an LM 371 and a potentiometer. The only problem was that there were some conflicting schematic online about how to connect everything. Attached is a schematic. Can some please verify that it is correct or identify what I need to change? Thanks so much.

Screen Shot 2013-07-30 at 1.38.21 PM.png

Your resistor & pot are wired incorrectly. Look at Figure 7 on the [u]datasheet[/u].

The resistor and the pot should both be directly connected to the 317. The pot connects directly to ground, but the 317 has no direct ground connection.

So like this?

Screen Shot 2013-07-30 at 2.29.11 PM copy 2.jpg

So like this?

Almost... The middle "slider" on the pot should connect to the 317 and the the resistor. It's OK (actually preferable) to leave the connection you now have between the pot and the 317.

(As it is , you don't show a connection to the movable part of the pot so you don't have a variable regulator.)

To clarify, DVDdoug is saying to keep pin 2 connected to the bottom of R1, but bring up a connection from the slider to that junction.

last try…
Thanks for your help.

Screen Shot 2013-07-30 at 7.26.56 PM copy.jpg

You would not have any issues like this building one lol :astonished:

10k is a bit large for the pot. With a 240 ohm for R1, that is about 5.208mA. But that means at full swing, 10k x 5.208mA = 52.08V, plus 1.25V = 53.33V.

Are you planning on running the LM317 at full input voltage? If not, you might consider a lower value for the adjustment pot. 5k will get you up to about 27V and make it easier to adjust.