amateur_24
Member
Hi
I'm designing a variable Power supply capable of delivering up to 30v. The Power brick am using to power it is capable of 40Watts of power according to the label. I'm using an LM338 configured as a variable regulator.
I understand to measure volts I would use a voltage divider. In fact I worked it out to be 100K for R1 and 20K for R2. Do I just connect this voltage divider to the output pin of the lm338? I was planning on using an arduino to
measure the voltage but doesn't the arduino have a maximum current of 20ma per io pin? If I'm not mistaken the lm338 serves upto 5A current
I'm designing a variable Power supply capable of delivering up to 30v. The Power brick am using to power it is capable of 40Watts of power according to the label. I'm using an LM338 configured as a variable regulator.
I understand to measure volts I would use a voltage divider. In fact I worked it out to be 100K for R1 and 20K for R2. Do I just connect this voltage divider to the output pin of the lm338? I was planning on using an arduino to
measure the voltage but doesn't the arduino have a maximum current of 20ma per io pin? If I'm not mistaken the lm338 serves upto 5A current
Last edited: