Tag Archives: avr countdown timer

Timer for Ultraviolet exposure with UV LEDs and PWM fine tuning

Timer for Ultraviolet exposure with UV LEDs and PWM fine tuning Timer operation video Timer measurement video Previous timer projects had only on/off possibilities for the UV leds. Some projects need a finer tuning of the UV value, and I am not talking just about PCBs. Stamps and other things need ultraviolet curing, with setups […]

PCB exposure with UV Leds and digital countdown timer DIY

  PCB exposure with UV Leds and digital countdown timer DIY   I have worked for years with a mercury-discharge bulb for exposing PCBs and it started lately to show symptoms of old age. I have decided to retire the old stuff and to replace it with a modern installation, using UV Leds and a […]