r/diyelectronics

Im a noob.

I have a 30w solder iron and an “85W” solder iron I just bought on Amazon for $20(although watt meter never goes past 30w).

For the life of me, I can’t get either to sufficiently melt the solder from a relay on a PCB board even using a broad tip.

Do they just not have the power or is holding the tip on the solder for 10 seconds the wrong way to do it?

If it’s the iron, what should I buy?

I want to know can i use the same arduino code to program cheap unipolar stepper motors 28byj48 and bipolar stepper motors. I am making writing machine with cnc shield v3 and the conections are the same for the motors. I am asking becouse i want to use the code for bipolar motors to program unipolar motors. Thanks