Has anyone modded a H1-A boost driver?

You may want to try asking BanL, he's Kaidomain's representative (and flashaholic) around here.

Don't forget to ask how the @#$% do they dare to implement such a PoS in an expensive product geared for aware people who clearly dislike that sheesh. It's an awful joke.

I just PM’ed him. Hopefully, he has some insights into the driver that he can share with us.

You could try the pencil trick on each one.

But if I do the wrong one will it change anything else on the driver?

I guess I am lucky the H1-A driver I got also does have the pre-flash when you switch to low mode, but it has on-time memory with a ~3 seconds set time. I would rather have off-time memory but on-time is better than next mode memory

@ doubleone44 : I will test the driver with a XHP35 when I get home it didn’t even cross my mind that it could work.

EDIT :

Just tried a XHP35 didn’t work I measured 7,22 V @ the emitter.

Or it could be that the driver I got that has an issue. I have more on the way that I can test once I get them in a month or so.

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)…