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Thank you for this simple circuit. But I'm not sure what you mean about the Zener needing to shunt all the power and burning up. My plan was to use a resisitor (probably 10Ohm) to limit current. And since the Milwaukee charger has cell monitoring, it won't let any cell charge over 4.2V...
Interesting, all the documentation and experimentation I have seen shows that they have balancing hardware (through a 1k resistor), but that they are not programmed for balancing. There's some great videos like this one from Tool Scientist. I would LOVE a drop-in replacement but I don't have...
I was wondering if that would work, thanks. I can't seem to find the specific BZT52C4V1 or a 4.1V in the MMSZ series. I did find some axial diodes that are 4.1V and have a relatively tight tolerance, listed as 4.0-4.2V. But it seems like 3.9 is the highest under 4 that comes in tight...
Hi there. Some lithium tool batteries have a tendency to go out of balance over long periods, such as Milwaukee's notorious HD 9.0 and 12.0 batteries (the ones I have). They don't have built in cell balancing (even though they have hardware for it), so I'm trying to think about ways to add it...
It's 1s3p, and it was at 2.85 but I charged it up to 4V with my power supply (I'm familiar with lithium batteries). The pack was listed at 3.6 volts nominal
Yeah that makes sense. The thing is the IC seems to be getting power somehow because when I push the power button there is an inrush of current for about 1 to 2 seconds which peaks around 1A.
Thanks I can start working on that. Still going to cross my fingers that someone knows how to deal with this board in particular or has some specific troubleshooting steps that they know of that might help with this board. Since power seems to begin to flow when I initially push the power on...
Thanks, but I have a different board revision, and I'm not sure I understand that service manual well enough for it to help me unless you're suggesting I just physically, manually check every single component on the board? I'm going someone has experience with this board or a similar one and...
I have a JBL charge 4 Bluetooth speaker. Motherboard appears to be having some kind of issue. When I power it with my lab bench supply it peaks a little less than 1A for a second or two then won't do anything. I've tried using the battery pack, which seems to be good, but also no dice. It also...
I suspect you don't really understand what I've been saying this whole time. The LED array is rated at 24W. I'm running it through an effective 73.3ohm resistor. The voltage across the resistor is 4.41V at the moment. Ohm's law tells us that's about 60mA. I have 12 parallel sets, makes 5mA...
One is a calculated usage, one is a rating from the manufacturer. A rheostat could also easily handle numbers like those, not sure why you think there's a problem.
At the moment yes, one resistor (3 in parallel, but effectively one), and then the 12 strands of 6 series are in parallel. I brought the resistance down to 8.8ohms for a test and it's WAY brighter but it burns through the 10ohm, 1/4W resistor (running about 10x the rated current through it)...
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