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Apr 1, 2019 at 9:25 comment added Transistor You do the PWM with the microcontroller and use that to switch a transistor or MOSFET or, if your frequency is very slow (>= 5 s duty cycle) you can use a relay.
Apr 1, 2019 at 8:10 comment added saurabh kumar i actually looked for pwm controller but they all have a mechanical potentiometer for voltage control but i have to control that electronically.How could i do that?
Mar 29, 2019 at 21:21 comment added Transistor Thanks, Spehro. I'm not sure we're ready for that.
Mar 29, 2019 at 21:08 comment added Spehro 'speff' Pefhany +1 Might be worth explicitly mentioning that controlling voltage gives a nonlinear heater power proportional to voltage squared for a fixed heater resistance, whereas PWM, as you say, gives linear power with duty cycle.
Mar 29, 2019 at 17:48 history answered Transistor CC BY-SA 4.0