Okay.. the out put is 12volt. But if I try to regulate it down it refuses to decrease intend remain constant and then go straight by showing me 0.01volt, if I should try to increase, just with a little turn it will just go straight by showing me 12volt.. so it doesn't regulate accurately...The resistor connected to the adjustment pin of the regulator is how you change the output voltage.
There could be any number of reasons why your circuit is not working properly, and you are going to have to give a lot more information to get any reasonable help, you can start with putting the values of the components on your schematic.
Okay.. the out put is 12volt. But if I try to regulate it down it refuses to decrease intend remain constant and then go straight by showing me 0.01volt, if I should try to increase, just with a little turn it will just go straight by showing me 12volt.. so it doesn't regulate accurately...
Okay, that you. But Which resistor that would guarantee the regulator to function well. Or will you mind if I should ask of aView attachment 252360
A 220 ohm current set resistor isn't small enough to guarantee that the regulator will function. The datasheet specifies a minimum current of 10mA for correct operation.
The two electrolytic capacitors are drawn upside down. The 10uF cap is shown an non-polarized. It would be huge if they made 10uF.
If you use a 120 ohm resistor (the value recommended for an LM317), that will provide a minimum 10mA load current (1.25V / 120Ω) to maintain load regulation for any output voltage setting.Keep the 220 ohm resistor and place a 1k resistor as a load.
The 220 ohm resistor will draw about 5.7mA. If you add a 2k resistor on the output, that would give you more than the 10mA needed. If you use a 120 ohm resistor, that will satisfy the minimum load current requirement by itself.But Which resistor that would guarantee the regulator to function well.
Okay.. thank you, I will get a 2k pot then replace 220 ohm with 1k as the load..Do you have a 5k pot? A 10k pot may be using too small a range to give proper control.
A 2k pot would be even better.
Keep the 220 ohm resistor and place a 1k resistor as a load.
Be sure to place that output cap...I don't see it on you new schematic.
LM317 3-Terminal Adjustable Regulator datasheet (Rev. Y) (ti.com)
Okay thank you for your support and the knowledge, I really do appreciate..The 220 ohm resistor will draw about 5.7mA. If you add a 2k resistor on the output, that would give you more than the 10mA needed. If you use a 120 ohm resistor, that will satisfy the minimum load current requirement by itself.
Okay thank you for your support and the knowloThe 220 ohm resistor will draw about 5.7mA. If you add a 2k resistor on the output, that would give you more than the 10mA needed. If you use a 120 ohm resistor, that will satisfy the minimum load current requirement by itself.
Okay.. thank you. I'm going to change the 220 ohm to 120 ohm resistor..If you use a 120 ohm resistor (the value recommended for an LM317), that will provide a minimum 10mA load current (1.25V / 120Ω) to maintain load regulation for any output voltage setting.