Im kinda new to electronics and have some questions before i solder my projekt together. I want to make an Arduino controlled soldering iron and designed the circuit below. The optocoupler i used is a LTV-817 and by iron i mean the heating element at around 3Ω.
- My problem is that the transformer features an open circuit voltage of around 50V AC peak to peak and I am not sure how the optocouler IC1 is able to handle this. Do I have to choose a different resister value?
- The second Problem is the current limiting resistor at the gate of the triac. How is the value calculated?