Modded one that had 2xR068 stock. With similar (combined) values as my other one, output was a bit different. So, maybe its wise for people do test these things on their own drivers.
ImA4wheelr, the way you connected it in post 52. Does it whine in any of the modes that way too? What PWM frequency are you using?
Anyone who is able to incorporate low voltage warning and cut off for 2 cells in series?
Glad to hear you got the right driver finely. Did you get the "B1" version?
I'm assuming you are meaning using a 105C driver board as opposed to just an unmounted Attiny chip. The PWM feed should only be wired one way as the first way I did it basically takes you into direct drive. I didn't notice any whining, but I have to tell you that I'm pretty deaf to high frequencies.
I think the whining was amplified by having the driver hanging in the air and not having the heavy brass ring on the driver (like I did with the Post 52 pictures). I think just mounting the MCU properly and also mounting the driver in a light would eliminate most of the whining. I bet my potting recipe would absorb the rest of whining as it is a clay like substance.
I want to solve the whining issue too. Hope to get back to the driver this week. I need it for a couple lights. I'll ask my wife to listen and report back.
EDIT: Opps, forgot about your frequency question. 9kHz. Here are the lines from DrJones' MiniMo FW:
Hooked PWM to the 30,000 ohm resistor on the MCU side of the resistor, got ground from the ground ring and power in to the ATiny13A from the pad at the lower right side of the board.
Once I figured out the wiring to the e-switches in the TK61 (&@#~!!) it pulls 7.15A to the de-domed XM-L2.
That would be cool if someone knew the answer to CC's question.
DBCstm wrote:
Hooked PWM to the 30,000 ohm resistor on the MCU side of the resistor, . . .
For some reason, I couldn't get the driver to work when I tied in down stream from the point I tied into in Post 52. I was tying VCC in at a different point though when I did that. I will have to try that again. Do you know if there is any benefit to feeding the PWM through the resistor? Where I tied, PWM of 1 works. How low can you go tying in through the resistor?
From the Qlite, the wires were connected here: (picture from my other HX1175B, looks extra dirty due to light)
Found my error when looking over this post. You can see it in the first picture. Two of the legs where the HX-1175B MCU stood were connected. Problem solved.
There is some high frequent whine on "medium" with the qlite too. Mode spacing with regular Qlite firmware is really strange.
Low - 0,4A
Medium - 0,87A
High - 7,9A
Im glad it works. Thanks a lot ImA4Wheelr! :)
When I learn to program and flash these drivers I should be able to get nice mode spacing.. Please let me know if someone is able to find a solution for the whining.
Here is a close up picture if you need it.
Edit after a little tweak:
0,05A
0,99A
8,12
Well regulated down to about 5,6V. High sinks down towards 8A.
AFAIK they have definitely not been ID’d. The 10-pin is almost certainly an MCU of some type though…
RaceR86’s “other” board shows an “A” on the 6-pin chip. The 10-pin MCU is really well ground, looks like they built a machine to do that.
Racer86’s 10-pin chip does show an important marking though. There’s the dimple for pin-1 but there’s also a little dot beside that. It seems that the dot must be part of the manufacturer’s marking or logo, it almost certainly does not indicate a pin or anything. I don’t know who. Maybe someone wants to pour over sites like this one.
Where is the whining coming from, can you tell? Consider potting the driver, as suggested by ImA4Wheelr. I assume that epoxy potting will be much better at quieting it down than his clay-like recipe, but also way less reversible ;-).
I can tell you that my analog meter on my power supply says about 7,8V and 5,6A input. Or 43,68W
Emitter current at about 8,1A (XM-L2) then voltage should be about 4,2 according to graphs. 34,02W at the emitter
None of those numbers are precise. But that gives me a bit below 80% efficiency and more than 9W of heat in the driver with the combo above.
Long before this thread was started I had some numbers that said about 85% efficiency, but those numbers were not super accurate either, and emitter amps were lower.
Either way. 9W is a lot of heat for a driver circuit, so better make sure its able to get rid of that heat.
Glad to hear you got it going. I guess I need take some pictures of a proper connection. I tried to explain in Post 52 that the pictures that the wire was not connected to the correct pin, but the "B" marking was where to connect.
Wight,
I have to disagree with you about epoxy being superior to clay in deadening sound. I use to build speakers and clay is an excellent material for helping preventing reflections that cause standing waves and such within a speaker enclosure. It absorbs sound waves (higher frequencies) and vibrations very well. I'm not claiming to be an expert, but epoxy is much harder and more likely to transmit vibration.
You could be right. I recommended epoxy based on it’s lower viscosity. My logic was that a lower viscosity would allow the epoxy to better conform to everything. Epoxy is normally used for potting electronics of all types. I assumed that if we could limit the movement of the stuff that whines then there wouldn’t be any noise to deaden in the way that you describe.
I’m quite sure about the lower viscosity being an asset for thermal potting, but I’m definitely not sure about the noise part.
And I should also say that you could be right. My recipe will press into almost all the small crevices with ease, but it probably won't get under a component (where as epoxy may get pulled under by capillary action). Your really need to play with the stuff to appreciate it. I should note that it is very difficult to remove it from those small crevices.
Yes, that particular duct seal that is specified in the thread. I wouldn't substitute oil based clays. In my experience, oil based clays liquify when they get too warm. I don't know what that duct seal is made of. It seems like an oil base clay, but it doesn't run when it get hot.
Note that djozz shows slightly different markings from what was on RaceR86’s driver. From what I can see it’s an open circle and a filled circle? (and of course also the big dimple, I’m not talking about that)
