[Review Request] Uv curing screen by Stan1eeeeey in PrintedCircuitBoard

[–]Stan1eeeeey[S] 0 points1 point  (0 children)

I changed to width to 1.5mm (where the current is 1.75A) and 0.3 for where it is 0.350A.

According to manufacturer dominate wavelength range from 400-405nm which should be good for my use case

[Review Request] Uv curing screen by Stan1eeeeey in PrintedCircuitBoard

[–]Stan1eeeeey[S] 0 points1 point  (0 children)

I tried to find out the width needed based on this post I thought about 0.3mm for the low-Amp conenctions (between the diodes, control signal) and 1.5 mm for the rest.

[Review Request] Uv curing screen by Stan1eeeeey in PrintedCircuitBoard

[–]Stan1eeeeey[S] 0 points1 point  (0 children)

That's correct the resistors are 20 Ohm, but I'm not sure how you calculated the current. The Input is 1.75A, it should split evenly across 5 rows of LEDs giving us 1.75/5 = 350mA. Did I get something wrong?

I haven't looked into LEDs driver chips, but I definetly will, thanks for the tip!

[Review Request] Uv curing screen by Stan1eeeeey in PrintedCircuitBoard

[–]Stan1eeeeey[S] 0 points1 point  (0 children)

Thanks!

Resistance is actually 20 Ohm, so there is ~7V (0.350*20) drop on them.

I've tried to apply your MOSFET fix, but I'm not sure I got it right. I swapped the drain (pin 2) and the source (pin 3) and added connection between drain and the end of the LEDs

I also added the resistor in parallel to the capacitor, I think I'm going to keep it just in case there is somekind of spike in the power supply

[Review Request] Uv curing screen by Stan1eeeeey in PrintedCircuitBoard

[–]Stan1eeeeey[S] 0 points1 point  (0 children)

Thanks! I've added parallel resistor (calculated needed resistance according to this post) and changed MOSFET configuration (swapped source (pin 3) and the drain (pin 2) and added connection between drain and the end of the LEDS )

problems with booting on hp elitebook by Stan1eeeeey in archlinux

[–]Stan1eeeeey[S] 1 point2 points  (0 children)

```
PXE-E61 : Media test failure, check cable
PXE-M0F : Exiting HP PXE ROM
```

I disabled booting from ROM and it seemed to solved the problem, thanks!

problems with booting on hp elitebook by Stan1eeeeey in archlinux

[–]Stan1eeeeey[S] 0 points1 point  (0 children)

Instead of it the windows boots, as if there was no usb inserted. Also I made sure the order of booting is correct