UltraFire SK-98 XM-L2 U2 (FT's SKU4521200)

That driver looks to be from the same family as this one. (my emitter was a Lattice Bright :confounded:
How can such a simple driver do so much?

I pulled this driver out of an UltraFire C8.
It has 5 modes, High, Med, Low, Strobe, SOS.
It does this with 1 three legged IC, 1cap and 5 resistors.
I was just wondering if somebody could explain how this very simple driver does so much.

I did a few searches on the HG5K1 IC but only found somebody selling parts for a long range cordless phone :person_facepalming: