"48W" UV resin curing light teardown (Patreon)

48W UV resin (nail varnish) curing light teardown with schematic

A look at a neat UV curing unit with automatic infrared trigger beam option. The unit claims to be 48W, but it's not. I'm not sure why they rate it at that power - other than for sales to non-technical people. There are 30 UV LEDs of the type used in these resin curing units, with a dusting of phosphor to give a comforting fluorescent style glow. Without the phosphor the unit would look visually dim. A 30 second burst does a good job of hardening standard UV active resin, and the scoop of LEDs provides good angular coverage. The circuitry is very minimalist as is common in mass produced beauty products. They've used some clever tricks to give good functionality, including intensity control, several timing options and an infrared beam for contactless operation. The listing description for this unit was:- LED UV Lamp 48W Manicure Phototherapy Lights Nail Polish Gel Quick Dryer Device No link to the seller because they've just blocked the Isle of Man as a shipping destination. Those keywords will also bring up a wide range of others. I've just ordered a "150W" one. I did some extra tests as follows. Infrared LED current 25mA IR photodiode divider open 0.19V IR photodiode divider blocked 3.7V (so viable as a simple logic input) UV LEDs start to glow at 2.8V and at full current (about 45mA each) are 3.7V If no time setting is selected the infrared beam will trigger the output for up to two minutes before cutting off. The PCB does seem to have locator holes for a missing LED light guide. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators