Hello to everyone, i'm new to this forum so i hope i'm posting in the correct section. I've a problem on dimming LEDs with Arduino Uno PWM pins. I have connected 3 PWM to 3 TIP120 transistors to dim 3 different 12 Volts LED stripes, but when dimming the Stripes visibly flicker. Why do I have this behavior? And how i can overcome it? I've used as 12 V power supply three different sources: a 12V stabilized power supply, a 12 V DC adapter (12,8 V measured) and a 12 V DC adapter (18 V measured with a tester) all taken from old electronic stuff, and i saw flickering in the first two power supplies.
Thanks in advance.