The 40V angle grinder PCB
Added 2022-12-01 05:26:54 +0000 UTCKinda complex and interesting. Getting the PCB out of the housing was not fun at all, as it must be soldered in position due to side indents that stop it being slid out after the contact retaining bar is removed. I hacked the indent ridges out so I could slide the whole assembly out and then desoldered them individually.
The dovetail contact retaining bar was also glued in and required heat and force to get it slid out.
Most of the circuitry is for deriving power supply voltages and controlling the MOSFET. I've just done a quick test on the battery and the NTC pin seems to be pulled to 0V, so maybe the processor tries to pull it high and the pack pulls it low to enable operation.
The battery pack will be getting its own video.
https://www.youtube.com/watch?v=hlUrQWefEjg
Comments
Alas, no. It had to be pulled sideways to slide the contacts out.
Big Clive
2022-12-04 06:14:57 +0000 UTCYes. It's weird with unidentifiable chips and tons of mini MOSFETs.
Big Clive
2022-12-04 06:14:11 +0000 UTCIf you took out the dovetail strip first, couldn't you just have taken the pcb, with contacts attached, out straight up?
Jonas Otter
2022-12-04 05:42:18 +0000 UTCPlease can we see inside the battery pack?
Simon Hopkins
2022-12-03 08:28:50 +0000 UTC
