hello guys, I am very new to electronics where I have designed the LM317 power regulator for my led power driver project and the output voltage has been set for 10volts of 500ma where I am getting around 2.4v as output and my input voltage is 13v my circuit diagram is pasted below and please someone tells me where I have made a mistake.

​

 

How did you get those values for LR1 and LR2?
Typically LR1 is set to 120 ohms (so that regulation is maintained even with no load).
Since the LM317 maintains a constant 1.25V between the output and the Adj pin, the current through LR1 would be 10.4mA.
To get 10V out, this current must generate 10V-1.25V = 8.75V across LR2 (the current through LR1 must also flow through LR2 since the Adj pin draws negligible current).
So LR2 then equals 8.75V / 10.4ma = 840 ohms.

Try those values and see what output you get.

 

if you Google LM317 resistor calculator. It can be a quick way to double check the maths. Also L3 is providing current limiting not constant current. So if your just powering some LEDs that's fine, if your powering a high current led. Look up constant current lm317. In which you will need a 2.5ohm 1watt resistor.

 

I have designed the LM317 power regulator

The datasheet specifies a minimum load current of 10mA for regulation. With Q4 off, you have about 1mA.

 

Haven't seen the TS since his original post on Wednesday.