That is even more humorous. I never realized that were multiple 'official' KSGER stores. And 3 no less. It only ever gets weirder the closer you look. At some point certain things click, but not others.
I mentioned the similarity of your PCB to the v2.1s r2 because it suggests that your v3 might be doable for the PTDreamer open firmwar (the LuckyTomas fork for v2.1s, this is now set to my master branch). Since they are so similar.
I expect the reason for this further revision will become aparrent after mapping out the differences. Perhaps KSGER realized the v2.1s rev2 had both bad opamp and bad 3v3 vrm switching converter on it. And decided to improve that aspect? Well IDK myself. But its not too hard to just look up those 2 ics part numbers and check them online.
I certainly have to replace those parts on mine.
BTW i'm sure youve noticed in my other folder there are 2 over so called 'v3x' pcbs. Neither of which is anything like yours. So that is really a big reason also why yours has been labelled as 'v2.1s r3'... just to try to avoid confusing it with the other v3 ones.
BEARING IN MIND that in this screwy world its actually the v2.x series which are more revered / trusted models. Being older and closer to the original v2.1s is a more desirable thing. Crazy i know. Oh well.
In regards to the research I collect 'any useful infos' from 'all places'. So long as it does not directly infringe on the original product (eg the actual JBC stations and their reversed schematics etc. is omitted). I do that for mostly the reason that it's not necessary. Since there are other possible schemes to power an original JBC cartridge. Its only the investigation of the cartridge itself which is really required to know and develop a product for. Something which many others have already done at this point.
I am still collecting. Not everything is up online. But I just wanted to point out (in the meantime) that there are versions of the original closed firmware that already support powering JBC C245 tips. And so your station being newer perhaps might already support that. Without requiring you to flash the open firmware first. BTW you could actually make your own handle here is an example
https://github.com/dreamcat4/t12-t245-controllers-docs/tree/master/tips-and-handles/t245-c245/diy-handleHowever that is not the one i was referring to earlier. I do not have a link. Maybe look in the comments section of the mysku.ru review pages instead. Not the review at the top... look in the comments thread underneath each review. Some words dont translate well from russian. So using ctrl+f for searching can be a bit difficult. e.g. 'tip' --> might appear as 'stringer'. And so on.
Otherwise I have not remembered where the original discussion about the better t12 handle was. However I have (for sure) found it now in my aliexpress bookmarks. It is the version in the listing below identified as 'handle 5'. From the product selector images.
https://www.aliexpress.com/item/33004762167.htmlTo be clear; it is the Silver (aluminium) handle. But also with the green foam soft grip over the fingertip area (aka looks like they tried to copy the jbc green soft grip). And to be clear; i myself have not aquired that accessory myself yet. It was just recommended by some other people I came across during my research. After some remarks like 'all the other handles are junk'. Or whatever they said about it. You get the picture.
Hope it helps. I know its probably not the cheapest T12 handle out there. But probably well worth the extra cost, given how important the feeling in the hand. And how much you expect to use it.
In regards to the 12v thing. I cannot remember right now but there are probably other better ways to limit power to a c210 cartridge. Rather than lower the psu voltage, just change the maximum pwm duty cycle when the t210 is detected. That should also work. Actually i believe the reason is probably more to do with the thermocouple being entirely different. Both the thermocouple wiring and the coeffecient for the formula. Better details about those tips in this thread:
https://www.eevblog.com/forum/projects/yet-another-controller-for-jbc-t210t245/