All of these boards use PWM. Yihi uses a pulse to control their TC system. Which is why you get that smooth pulsing sound in TC mode. In power mode on the SX boards its a PWM signal that is filtered thru capacitors so the user end signal is flat. All dna's are PWM, the signal is filtered with capacitors so at the user end its a flat signal. Evolve boards in TC just dump the power off when you hit temp. You do not hear a pulsing sound with the Evolve boards in either mode.
I dont think the signal on the SX boards in TC is offending at all. I kinda try to tune my vape by the sound, if you can get it to a nice smooth pulsing sound it usually vapes pretty well.
Last edited: