So I “tore down” this dirt cheap thingy, this is a twistie with a 3-mode driver (mode order is : high, low, strobe :person_facepalming: ) and advertised as XP-G R5 (so I guess a fake of some sort). I intend to use 1xAA NiMH batteries with it.
Is it possible to mod it to only have 1 mode (high) without changing the driver? (ie, shorting or removing a component off it?)
That would be a good mod if you could take out the strobe mode, but unfortunately I’m not sure which chip you would need to disconnect to accomplish that.
You could try removing all components off the driver, and find a positive and negative trace to direct drive the LED. Not sure if it would be able to handle being DD…
The post title states it’s a “1xAA twistie”. So I don’t think direct drive of 1.5 volts would be enough to power the LED. Somehow AgentSteel needs to maintain the boost part of the driver.
That’s the old SuperLight that was available a while back. Yes, it’s a LB emitter, but for the price, it was still a surprisingly good little light. I did a XM-L mod on one and it gets hot in a hurry.
Not sure how to disable the modes to make a single-mode operation.
Do you want to keep the AA functionality or are you going to be using a 14500 lithium? These cheap single mode drivers from FT are a good fit for these little lights off you are able to use lithiums… https://m.fasttech.com/p/1127404
Just barely? On mine, shelf is actually an integral part that the PCB sits flat on. In fact, I actually sanded mine down to remove the dimple in the center, then lapped it to a mirror shine for my XM-L mod and ended up with a great thermal path…
Apparently, that boost converter chip (component with 6 legs) also has built in modes. I tried searched to find its identity, but my Google fu is weak tonight. If you can find it's data sheet, it will say if the modes can be disabled. Since there is no apparent zero ohm resistor or solder blob to ground, Jerommel's suggestion about removing a capacitor seems to be the last hope. The capacitor would be the smallest one on the PCB and only connect to one pin on the boost converter. I can't clearly see the traces, but neither of the 2 caps appear to be for that purpose. Hopefully, I'm wrong. Best wishes.
Lapping machine? That’s sandpaper (fine-grit) on a flat surface. When smooth like you want it, a plain sheet of paper with rubbing compound. That’s how I polished mine out.
For the flat side of the star, sandpaper on a flat surface is fine, but on the shelf, I’m concerned about taking off more from the middle than around the edges, making it more of a saucer.
The modes are in the led driver SOT23-3 (3-legged) marked GY02 . Try bypass pin 1 and 3. This should bypass the “internal” switch and make it 1-mode, assuming I read the schematic correct…