Hi everyone,
since its dirt cheap and i wanted to upcycle some very old crappy linear fixed voltage power supply a little bit i recently bought this kit from an ebay seller:
https://www.ebay.de/itm/172830484802i thought, for this price i cant do anything wrong really. but still i was expecting at least "some grade" of an professional trader or supplier, offering some proper schematics, a bill of material incl. all names, specs etc. to download. but no.
all they provide are crappy low resolution screenshots/web graphics some poor chinese guy just googled and downloaded from somewhere and the low rez product photos they have on the ebay site.
no building , calibration or ANY instructions or manual at all.
The PCB and the cheap arse schematics they googled for me mentioned a "design by 3ag1" , xiaolon and two date codes: 20170510 on the pcb top side, 20150520 on the pcb bottom side.
for later documentation purposes i scanned the two sided pcb with a flatbed scanner in high res color. files are very large (50+ MB a side), so i cant upload them here in the original form. therefor here are two heavily downsized versions of the pcb + the schematics they provided. im not sure if this schematic does match the pcb. didnt checked it yet.
i hoped to find some good documentations / hight res schematics , manuals , bom or further material on this kit, but yet failed to find anything.
Does anyone here knows this kit too and does have additional documentation or "heads up" to it ?