The There Are No Stupid Questions Thread

I have several accidental cuts on both hands and arms after keeping knives razor sharp. Just carelessly closing one almost reached bone. Nothing like knowing its sharp if needed for protection. It took some experience to learn how to better handle the razor sharp ones. Now my every day carry ones are a little less than razor edge but still very sharp.

I have got a question about a 26mm FET+7135 driver (MTNElectronics). I soldered it myself and put it in a zooming light with XHP70.2. Recently I noticed that soon after turning the flashlight on the led starts to flicker slightly. I am not sure what the reason is and how I can solve it. Is the led or the driver components responsible? Any suggestions are welcome!

I would suggest you start ruling out parts to narrow the problem.

Try some different batteries. Does this fix it? If not, then the batteries are fine and we move on.

Try no tail cap and use a jumper wire instead. Does this fix it? If not, then the tail cap is fine and we move on.

Make sure the driver retaining ring is tight.

Since it’s a 70.2 and can handle direct drive, try shorting the negative side wire of the mcpcb to ground. It will go full power. Does it still flicker? If so, it’s the led. If not, then the led is fine and we move on.

If you narrow it down to the driver then you might need to ask a driver expert what component could cause it. You could go over the whole driver with hot air to make sure all your solder joints are good.

Jason, thanks for your explanation. I got the everything wired up correctly now. I just need to figure out how to fit everything in the host now… Hardest thing is going to be to get the switch parts to fit.

How do I get the reflector in optimal height to focus the LED perfectly? What do I look for in a beam or on a white wall to see if the reflector needs to be raised or lowered?

There’s no such thing. If your looking for the highest measurements, you can adjust it for that and possibly end up with an ugly beam. It’s better to just set the height to what looks best.

There’s a lot of technical stuff you can do to adjust it, but I don’t see the point in it.

Thanks JasonWW! I will follow your problem solving guide step by step. Unfortunately the flashlight has no retaining ring.

Can I short a driver throught the AMC 7135 (lexel´s bistro FET driver)? (If there will be a contact of AMC with brass retaining ring = ground?) I don ´t completely understand functionality, in this case more like polarity of driver components.

Anyone know off the top of their head what firmwares will work and fit on a BLF A6 FET+1 Driver with an ATtiny13?

I really need something different, but id be happy with a pretty basic clicky firmware with battcheck and no strobes.

Yes, I’m pretty sure that is possible. If one 7135 is shorted by accident then there should be a minimum of 0.350 amp going through the driver and the light will not go dimmer than this.

I took a quick look at MTN E to see what he offers on that driver with ATtiny13. Besides Bistro, you can use Guppydrv Dual if you have access to it. That’s all I know, sorry.

Hmm, I was just wondering, is there no such thing as a stupid question?

There are no literally no stupid question, especially in this forum.

Asking a question means you are interesting in learning more, which we should cherish.

Discussion and research should be promoted to cultivate critical thinking, and encouraging being curious and asking questions is one way to do it.

Hmm, that didn’t land…

What is “the” best way to dispose of lion bats? (18650)

Just trying to imagine a hybrid of lion and bat.
So scared …

:smiley:

Include them as a “free gift” with a Cometa?

Can’t seem to find any disposal sites that will take it.

Still waiting for my cometa :smiley:

The correct answers are to take them to either a battery bin at your local hardware store or Best Buy, or to take them to your local household hazardous waste center

I used to do a lot of laptop cell pulls, so at one point I had a 10 lb bag of dead cells. The hazardous waste center wouldn’t take it, as they said they only took household waste. I said, “This is from a household, but I know what you mean.”
I ended up taking them to a Batteries + Bulbs, and they took the cells no questions asked.