Has anyone modded a H1-A boost driver?

So I got confirmation from Ben that the driver has 3 second on-time memory as khas has said. I think I might’ve done something to my driver where the on-time memory got disabled. I asked Ben if he could point out the resistor that affects driver memory, so I’ll report back when I get a response.

Kaidomain has a 12 volt version of this driver. It’s rated at 1.5 amp at the emitter. The H2-C.

RS. FREAK at TLF (in German) made a resistor mod and measured lumens (but not current) on an XHP50. Using measured XHP50 power curves and a stock current of 3A for the H1-A it can be calculated that adding 1xR100 gave him about 3.55A and 2xR100 about 4.2A. Driver gets pretty hot.

Determining the current sense resistor stack value for a given current is no rocket science. It can be clearly seen in the photographs the driver uses an onboard R025 sense resistor. Thus:

V = I × R = 3A × 25mΩ = 75mV sense voltage

It can now be clearly seen how each R100 set in parallel adds 0.75A to the total driving current. Of course, excluding losses.

In conductance terminology: 0.025Ω is 40Ʊ (siemens, A/V), so when 75mV drop on a 40Ʊ pathway (resistor), 3A of current flow through it. For the same reasons, when 75mV drop on a 10Ʊ pathway, 0.75A of current flow through it. A 10Ʊ pathway is 100mΩ.

This conductance stuff is interesting for certain applications, because:

G = G1 + G2 + … + Gn (R = 1/G)

1/R = 1/R1 + 1/R2 + … + 1/Rn (G = 1/R)

G is conductance, unit siemens, symbol S or Ʊ.

LoL!

^:)

So any idea how to fix the next mode memory?

It doesn’t have that. Never did.

Ah cool, read the other posts properly.
So it’s on time memory.

Mine doesn’t have next mode memory

Yes, Banl said so in a post about these drivers and I also got a email from Kaidomain stating it as well. User Khas has an H1-A and reported the same. Mine should be arriving soon.

It has on-time memory. Meaning you have to leave it on a level for 3 seconds and it will be memorized. If you turn the light off before 3 seconds it will register that as a half press and then turn back on in the next mode.

I believe this is a driver Kaidomain is making themselves. They created the firmware themselves and its kind of a basic design. Hopefully they will figure out how to put off time memory in it. They also said they can do custom levels if 25 or more are ordered.

Thanks I missed that earlier, definitely an option now.

Driver is nice, it is running an xhp50.2 on my convoy L2 and performs very well. I’m looking forward to seeing boost drivers on the market

Let’s hope they make a 17mm version

How is the memory working for you? Annoying or usable?

usable, it starts on last used mode (if you let that mode for 3s before turning it off)

hmm, 25 or more….
I know that so many people have so many preferences, so I’m pretty sure this is not going to work, but:

Say I ask Ban for 25 drivers with my favorite UI: 1–6–36–100, always start on lowest with no memory. Would it be possible to get 25 people wanting this enough to pay the extra $1.80 for the envelope and stamp to send it from me to them?

I will just start a list here in post #24, who knows how far we get…. :

1) djozz
2) djozz
3)…

Well, I prefer to have mode memory, even though I don’t actually use it much. :person_facepalming: Also, I definitely need direct access to the highest mode, especially if there are 3+ modes. If you can get direct access to both high and low from off, and a mode memory toggle, so the end user can choose, you probably won’t have any trouble getting 25 drivers sold.

I would be in for two with DavidEF’s variation, or just the mode memory at the very least.

Ehm, we are talking about a clicky driver David, how do you see direct access to high and low from off happening?? And I expect with this hardware and no ToyKeeper around at Kaidomain I fear that a requested custom UI can not be too complicated.

Perhaps my favorite UI will round up fewer people than some other UI, but of course my motivation to start this is based on me wanting my favorite UI, so someone else should start an interest list for a different UI. I will just keep my list going in post #24, see what happens…

Ehm, double click? :innocent:

EDIT: Oh, and ToyKeeper is looking for a job, so…

1% - 6% - 36% (- 100%) mode spacing, I like that . Would also like some other sort of variable exponential driving current discrete set like: 0.03% - 11% - 33% (- 100%).

Mode memory seems fine as it is to me, last mode memory or whatever is it called.

Custom UI requests for a small fee could be a killer feature, at least for a given minimum of features: spacing and mode memory.

Not joining the party for now, would be quite unwise given my current financial situation.

^:)

Originally posted on Fri, 04/21/2017 - 14:30; typo fixup.

Just got my H1-A and H2-C drivers 2 days ago. Looks like the MCU is a PIC 12F, same as the FX30 driver that the L6 uses. So custom UI programming should be possible if the drivers were reverse engineered to determine the pinouts. Just need the PIC programmer. I just happen to have a Microchip ICD3…