Thank you everyone for your kind comments!
Thank you! Can you not purchase that particular battery in Canada? I'd imagine you will be able to buy it from say Digikey, Mouser or Arrow Electronics. There is room on the GFS16 for the charge pump IC, but I don't think it's very practical due to the high operating current on the order of 10 to ~100ish uA IIRC. Though with a 1mAhr battery, it just might be enough. Regardless, this is a big reason why I chose an e-Switch host for this project. The Emisar D4 is the logical choice.
Yes I noticed the 3V XHP50s at the start of this year, but I didn't really want to go to the expense of ordering my own MCPCBs that fit the D4, for four XHP50s, and I'll have to figure out an optic that fit. Otherwise, yes that would make an even more ridiculous flashlight. I'll be happy to design such a board if people are interested though, some kind of mass order? Though I believe Clemence on the forums here is the guru for high performance MCPCBS. :)
Thank you Agro, yes all will be up. This board is really simple, much less complicated than the switching drivers. The maximum regulated current is dependent on how you set up the current sense, but for now I have it set at 10A with 10bit resolution. I'll take a look at the Luxeon MZ. Good tip on the 20S. I thought the VTC5A was very good already compared to the pink 30Q, but the 20S seems even better! :THUMBS-UP:
Thanks for your feedback and concerns Lexel! For sure there can be improvements to the LED board, but it works and fits the MCPCB just fine, so no need to worry. The resistors can be placed better, but I could have also gone for 0201 resistors, at the cost of higher modding difficulty.
The wires do have significant resistance, though I used AWG18 wire I think, with about 1mR resistance.. As mentioned, I don't use the spring for conduction, only for mechancial retention. Why is why a steel spring is better. Copper foil is used for bypassing. Regardless, as mentioned, I think a CC FET driver doesn't make sense from an engineering point of view in terms of reliability, consistency, or safety. Practically speaking, with the right safety features and physical construction, it can make a good flashlight with a fun 'turbo' feature. The main functionality of this driver is a no-nonsense CC linear drive. The DD FET is more just for fun. :) Since we're going for ridiculous here, thought I could go a little further. Having a lower R_ds_on for the FET also reduces junction heating, which keeps R_ds_on low as current flows.
The main practical features of this driver is not the DD FET though. I really like the other features, and I think having a CC regulated driver for the Emisar D4 is not a bad option. Music reaction, is a fun gimmick too.
I'm sure Lexel just wanted to show some concerns with his experience building drivers. :)
Thanks everyone for the feedback!