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okay so guys in my previous video I told you that the variable heat selector function of this SMD workstation has gone bad and I need to fix it so interest video Iamp;#39;m going to fix it and also going to show you how it works so the main component that makes it to work is the transistor or track that I am showing you on the screen itamp;#39;s bt a 1 to 600 track that is on a to-220 package itamp;#39;s maximum current carrying capability is 12 ampere at 600 volts ac it basically works like a simple case see light dimmer circuit where the output power is reduced by chopping off a part of the AC waveform much like a dimmer circuit the gate trigger signal for the track comes from a charging capacitor through a Dayak and then goes in the gate of the triac here a diode one n400 7 is also used in between the triac and Dayak so that only half of the AC wave gets in the triac for controlling which in turn reduces the power to half that is going in the heating element at the maximum heat s
