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Thank you very much everyone ! Everything makes sense now

Yes multiples quick ON OFF in a few seconds, looking for bad contacts in the switch. It was shielded in a tube so probably not ESD. Thanks. Will do better next time

My 488nm diode fryied, went very dim. I increased the power to 200mA as diode heatsink wasn't hot ( saw a graph here where that diode was pushed double higher ) It seems to happened when switching ON-OFF-ON but it was also lukewarm ON for 3 minutes before. So the 'driver' was just the voltage...

It's 5,7V so 0,6W that should be fine for a such large resistor. That R is hot but not boiling :) What is looks like now

Thanks !! 7,62v x 0,110mA 0,83 W Old 3mm thick resistor seems 1W Can laser stays ON 100% duty cycle as long as brass heatsink doesn't go higher than 50°C ? ( datasheet says 60°C max )

I received my components and 488nm 90mA diode. And did a quick try : adjusted the boost circuit to get 90mA in a 50 Ohm R. Then I added heatsinked laser diode + Ampmeter to that loop. Now there's 90mA going in the diode and it increase by only 2 or 3mA as the diode warms. It seems very stable...

Thanks ! Now I understand and I know what to do :) I'll use fixed resistors with lm 317

Thanks ! I'll add a cap and use 125mA for low power cyan/green 6v diodes. Now if I want to drive a red 3v diode at 700mA R = 1.25/I -> 1.78=1.25/0,7 Then I use 1.8 ohm, and the boost at 8v ? Big 5w resistor is needed ? 3v / 1.8 ohm =1.66A -> x 3v = 5W I think I fryied a small pot...

One of my green dpss laser was doing the same dimming thing after one second. Luckily there was a pot on the driver, after lowering it a little, it doesn't dim anymore. It stays as bright all the time. (Even brighter than before) Without pot may-be try lower input voltage

Is this simple design okay ? Won't there be too much current inside the 0.15W potentiometer ? Because a 4w-pot is very large Thanks! (I'm waiting for my components)

Now I understand. Thanks ! I will use them with LM-317 as constant current driver. You saved me from frying precious diodes :)

Current will spike when switching On-Off ? In my actual understanding, constant voltage would make constant current. Like cranking up the voltage until desired current flows.

Hello, I just discovered these dc step up boards rated : 3-5 v in 3-15 v out 1.2 a max I'd like to use them to drive 6~8v diodes at 100~200mA from a single 4.2v li-on cell. Do you think that tiny pot can be precise enough to set 100ma ? Or is there major risk to fry the diode because of the...

Thanks :)

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Hi LPF, new member here. Laser enthousiast from Belgium. I own a few uv, blue, and green pointers. I plan modifying and building my own. Greetings