Answering some above unanswered questions:



1a. Electron1979 "What is the pad inside the 2 circles on the PCB

for?": I think the question is for the mounting/soldering hole under the

big (secondary) coil? That hole is absent in the newer board --- and

unused in the instructable here.



1b. Electron 1979 "What did you do

with the wire in the centre of the coil?" That's the un-soldered,

un-stripped end of the secondary: At the very first photo and also the

last "Add the Standoffs" photo, you can see a short end of it hanging in

the centre of the secondary coil.



2. DiamondD11 "you don't mention what the MOSFETS or the CAPACITORS are":

--Capacitors: That you can read from the board (e.g. last picture step3) -- the black one is 10µF [on the body it says "HDF 105*C 25V 10µF"], the fat flat one is 105(µF) [on the body it only says "105"].

--Mosfets: In my kit, one says B18 BD243C (It also says F which looks like a logo, and an E-inside-a-circle); the other says P75NF75 GKNRP V3 CHN ?05 (where ? can be a B or 8, hard to make out). It also has a logo and an e3-inside-a-circle. BUT! Notice that the board in the photo (last photo of step3, again) clearly says "BD243" for one and "80NF07" --- my board says "BD243" and "P75NF75".



3. Mondo1 "This has 2 different numbered mosfet. What happens if you reverse": I do not know enough to know if it matters, but again if you look on the board you see it clearly marked "BD243" for one of them, so put that one there?



Background: I have a newer (2018) board, there are some slightly different components (3white LEDs of which only 2get used, and 3x 10K resistors not 2x, and one differently-named Mosfet). There is NO thermal paste with my kit.



