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Potentiometers not working properly in circuit

PramodMunaweera

Feb 12, 2016
5
Joined
Feb 12, 2016
Messages
5
Hi friends,

I built a dual variable power supply using LM317 and LM 337 as shown in the tutorial in the link below,
http://www.circuitstoday.com/dual-adjustable-power-supply-using-lm-317-lm337
dual-supply.jpg

but the problem with my circuit is the potentiometers used to adjust voltage not working and not changing the output voltage, i have changed the potentiometers and the problem is still there, when i connect different resistors instead of pots the circuit works fine, so the problem is with the pots.

potentiometer_single_pin.jpg


Friends, please help me to solve this problem.Are there any typical problems with using pots in circuits.
 

Alec_t

Jul 7, 2015
3,587
Joined
Jul 7, 2015
Messages
3,587
Are you sure you are using the middle pin plus one end pin of the pot?
 

Arouse1973

Adam
Dec 18, 2013
5,178
Joined
Dec 18, 2013
Messages
5,178
I think you might have a wiring issue as alluded above.
Adam
 

BobK

Jan 5, 2010
7,682
Joined
Jan 5, 2010
Messages
7,682
I think your ground rail is missing some connections.

Bob
 
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