Re: WIP Complete Laser Creation Tutorial
2 in parallel two times... and those to sets in
series to get you 1.0 Ohms @ 1 Watt...
Hi, sorry for the correction, but this make it 1 ohm 2W ..... power is based on dissipation, so, regardless the fact you use them in serie or parallel, the powers are always summed (or multiplied, where they are equals, like in this case, so 4 x 0,5W = 2W)
Also, if someone really need a bigger one (more than the 2W), can use 9 of them for make an 1 ohm 4,5W resistor, placing them in parallel in groups of 3, then the 3 groups of 3 in serie .....
Just as suggestion
@toaster (about the resistors): Yes, being all equals, you can place them in serie 2 by 2, then the 2 series in parallel, or place them in parallel 2 by 2, then the 2 parallels in serie (same for the 3 x 3 example) ..... the result don't change, you still have 1 ohm at the end (basic ohm law).
Anyway ..... the other important thing to take in consideration, building a test load, is the diode
dissipation power (also the diodes dissipate power as heat, after all), not just their currents ..... 1N400x serie is rated for 1A MAXIMUM current, and also have a typical power dissipation of
1W ..... but, as all small axial diodes, have also a
small heat dissipation surface ..... they can survive to 1A, but in some cases they can become so hot to melt the solder alloy on their own terminals
..... if you are planning to make a test load for test 1A or more drivers, i suggest you to use at least 3A diodes, better if 5A ones, and to place some heatsink on them, too ..... i made one for a burn-in test using these diodes
and a big heatsink, and after some hours at 1,2A, it was too hot for keep it in hand
