I finalised the design of 3 different sizes of single cell boost driver :
BST15 : for 17+mm drivers, 60*0 inductor, 3333 RPP PFET, double sided, 1*AUX LED, also supports Mike C’s OTSM firmware.
BST18 : for 20+mm drivers, 60*0 inductor, 5060 RPP PFET, double sided, 3*AUX LED. With a BST18-FWxA version.
BST21 : for 23+mm drivers, 70*0/ 60*0 inductor, single sided with 3333 RPP PFET and an additional 5060 emplacement on the back. 4*AUX LED. With BST21-KRx version.
And I assembled two BST21s, one 6V and one 12V :
Then took some efficiency measurements, 12V3A, XAL7030 1.5uH, 3333 SISS61DN on the front for RPP :
With an additional 5060 DMP2003 on the back :
Lowering the inductor value to 1uH (5mΩ vs 8.4mΩ) :
Thanks.
BST18 and BST21 are E-switch only with Anduril 2. BST15 has additional support for MikeC’s firmware which supports clicky, E-switch and clicky+E-switch. His firmware isn’t finished though, he’ll probably resume development if I send him a bunch of BST15s.
It also has an off time capacitor emplacement, so it could work with an OTC firmware, that is if DAC and HDR support is added to the OTC firmware.
I installed one on them in a PL09 Quad with sliced 519A and AUX LEDs :
I transformed the MCPCB to 2S2P by cutting the trace between D2 and D3 (the line on the right is just some removed soldermask) and by creating another solder pad for the + wire :
I used a flex PCB I made for the FWAA before because I didn’t want to wait for a proper one made for the PL09, hence there are only 3 LEDs :
Though once the optic is on it’s not obvious where is the missing one :
Min level (70uA), could be lower with some tweaks but it’s low enough IMO :
Color measurements on level 7 (0.75A per LED) and turbo (3A per LED):
I’m very satisfied how it turned out, I really like this host and the beam is like pure neutral white for me.
It’s not dark magic like Tterev3 and his enamelled wire wizardry, but yeah I like using those wires, they take so little space that they can be comfortably long.
BTW Haukkeli Assembled two BST21-KRx , please check it out. He’s sort of my beta tester and I believe that was his first time assembling a PCB, demonstrating that it’s definitely doable to assemble them with just previous reflowing experience.
What’s delaying publication is more the shortage, I had to send a crucial component to Haukkeli so he could build them, there is an alternative but it’s not my preference (the ramp table would need to be changed and I don’t really want to have to manage a lot of firmware builds for everyone), digikey announces availability for early October, Mouser did too then pushed it back to December (and before that it was July)…
The Attiny1616 is also not available from the usual sellers, though LCSC has 6000 in stock, Digikey should get a good quantity in October.
Oh I also would like to find a name for them, but I’m quite uninspired :person_facepalming:
Not managing that many firmware builds makes perfect sense. And the chip shortage is what it is - I was supposed to get a Fireflies T1R from an OL contest not last year, but the year before. They still don’t have the drivers so I finally had them ship their newish 21700 Quad instead.
TheFreeman- this is such an exciting build for me to see, for many of us FireFlies I'm sure. I have the new PL09"Q" and I love the host size and battery compatibility, but mine has very Hi PD with the aux on high mode (orange), and they're imperceptible on low. Anyway, more importantly, a buck-boost driver we can make soon!
So I have been feeling stale in my current state of modifications (swapping drivers and LEDs and the usual intermediate-level shuffle of mods), and I'm no wizard and have never flashed a firmware on a light, but I am Very much anticipating building some of these drivers of yours, when that is available.
is there anything you could guide me to for a "parts list", I am sure you already mentioned it but it probably went right over my head lol.
Am I correct in understanding that OshPark will have thee available for printing soon? But not right now?thanks again!
this is excitement I haven't had since my first couple of months in the hobby.
I’m glad to see that you both are motivated to assemble some drivers
HI PD ?
I’ll share OSHpark and Aisler PCBs, the ones I used here are from Aisler (Germany), with part lists and instructions, a ramp table calculator and Anduril source code of course, with a few compiled builds (.hex), although I would encourage people to setup their machine for compiling Anduril and making their own tweaks.
, for 9V it just needs different sense resistors values for 4A and a different FB top resistor value.
If anyone has any of them for sale, I’ll be in.
