I made one for 445nm drivers too ..... seen that now we need something that hold more current, i thoughd it can be helpful .....
I took an old heatsink, 8 diodes BY225 and a 0,33 ohm 5W resistor (wanted a 0,2, but not found one of 5W, so i had to adapt that what i've found
) ..... glued the diodes side by side on the heatsink, placing them with 2mm of space between them, and aligned them ..... and glued the same way the ceramic resistor on the heatsink too ..... once it hardened, filled all the space between them and around with the same thermal silicone glue, and placed a strip of metal hooked with 2 screws over them for keep them better (i removed it in the pics, for show the diodes) ..... once completely hardened, i bent the leads and soldered them making "arcs", so for change the number of diodes in the load, i just need to hook the clip on the right "arc"
..... the two thin wires brown and green just goes to other 2 clips for hook the DMM leads .....
It born this way as "provvisory setup" for make a quick test, but seeing that is easy to use, robust enough and simple as it can be, it becomed the definitive version (also cause i'm too lazy for rebuild it with a PCB
)
The only "problem" that it have (if you really want to call it problem
), is that you need to divide the reading of the DMM for 0,33, or multiply it for 3,03 , for have the right value, and this is a bit boring ..... i was searching a 0,2 ohm so it was a bit more easy to do "at mind", cause with 0,2 ohm, you need to divide for 0,2, or multiply for 5, and multiplying a number for 5 is more "immediate" at mind ..... but, also this way, with an electronic calculator it's working good