The board is from Mountain electronics.
Maybe the Y5V cap isn't cutting it? Those are the crappiest ones out there...but besides that, everything looks great. What you're experiencing sounds like what happens when the capacitor isn't there or is too low of a value. The DC bias derating on those caps is horrific.
Try a better capacitor (maybe from one of my pre-built boards?) and see if that changes how it works.
Vob try bypassing (i.e. shorting) the D1 protection diode and see if that clears it up, then get back to us.
EDIT: Upon further inspection MTN Elec board has the C1 cap placed correctly for 1S DD operation, my bad eyes, sorry.
For what it’s worth, I had similar issues with the single sided boards using components robbed from 105 nanjg’s.
I’ve had to go back to the original dual-sided fet boards until my order from RMM gets here with the better quality caps.
I use Samsung caps( they are cheap arround here, 1.3 euros for 100pcs) and i dont have a single issue so far
For those of us, that do have shipping issues with Digikey and Mouser( actualy shipping costs issues)
those A13 controllers are good
- they seem original, the price is only 40 cents - i already bought 30 of those and i dont have issues with them: several i reprogramed many times ( one of them over 30 times, my test board)
I got several or those from Nitro, they are branded V030, with two of them have an offtime memory issue, was thinking its caused by capasitors, but after changing them the problem still stays
Yes, someone answered that above. Technically, this is in the wrong thread because this thread is on wight's boards, not RMM's, but really doesn't matter - VOB is having problems and getting some good help so all is good here. I might have missed VOB's note in the post about being from MtnE.
The MCU link is good - cheap source. I got burned before though by ordering MCU's off of eBay from China where every single MCU could not be programmed. The date code was like from 2011. The seller refused to admit to any wrong doing but didn't understand anything about the MCU's. The batch he was selling were probably pre-programmed in a way to make them not programmable via the normal USB dongle method. Think it was $15 for qty 20.
thanks for the links, looks like a good offer on both, bought some 
Yeah Tom, you are right, but the Digikey US shipping is quite allright, for me its 60$….same with Mouser, Farnell got those at 2.5 euros per piece here( like 3$ )….and sometimes Farnell has hella wierd shipping policy, 2 years ago i ordered 25 cob emitters from farnell, and since they dont have them( in spire they claim they do) in the Uk warehouse they tried sending them from the US- 45$ shipping charge plus 190$ tax for handling and packaging( chips alone costed like 90$ i)…. :bigsmile: …i denied the order ofc
I found this chart on NXP’s website im just confused to say the least. I know 3R0’s are recommended and i have been using those, while there is a debate that 2R4-30YLDX (RMM’s choice) are better , there are even lower resistance ones out there, but they have higher capacitance? not sure if lower is better for our application.
Mosfet Selection Guide: At Page 83
http://www.nxp.com/documents/selection_guide/75017631.pdf
We don't care that much about the slightly higher capacitance at our relatively pedestrian 19kHz switching speed.
I don't think that the 2R4 is really better or worse than the 3R0--it just happened to be available in bulk at a time that the 3R0 was not. The 0R9 is the best out of NXP's line, and the SIR800DP I think is even better than that. But really, you're just splitting hairs at this point.
Are we there yet? Almost?
Build one of these yesterday for a DD red Convoy S2+ I was building and some how managed to get LED + and - connected which shorted out and melted my switch and soldered the switch spring to the bottom of my 25r. To say I panicked is an understatement. Good news is I’ve fixed it and it’s a BEAST! Just need to tweak the firmware to make it perfect.
can the LFPAK FETs be bought anywhere without 20 $ shipping (mouser/digikey) and be payad with paypal (no aliexpress) ?
i am interested in 5 for playing around…
Seen those on Ebay, but havent realy tested them, the ones that i boguth from Ali are originals, at least 100% same as my first Farnell order( that costed me 4 times more)
M4D M4X , if you cant find those i will visit the PO thuesday MSG me if you like some, you are doing great BLF community job( and all those nice codes too), i will be happy to help you
”
This is a polish company , they can be trusted too, i work with them from time to time and their shipping isnt that high
Can be a good option for EU buyers too
I just get mine from RMM.
There may be cheaper fleabay options, but I’d rather not waste time ordering unknown’s.
Any idea on the mosfet heat dissipation at 3A output?
Non really the MOSFET in this kind of direct drive controlled by PWM levels makes no notiseble heat.
But in a linear MOSFET driven driver, like led4power’s LD-1 driver, they can get very hot in the middle levels.
I will try and order in Poland 