The idea of this scheme is to control a 1ohm nichrome resistor (heat it) to melt a wire. I have used BJT transistors and an NMOSFET. I carried out a series of tests… Could you tell me if there are errors in this scheme?
This forum is on using the Kicad software, not a general electronics site. Using the software for a project doesn’t mean it is a Kicad question.
1 Like
What @hermit said, but in the meantime: (looking at the right diagram on the 2nd page.
- Q1 needs to be an NPN
- Q1 needs a base resistor (when you change it to NPN)
- R6 is way too high unless you have a high PWN rate.
- Source of the NMOS needs to connect to GND.
- Not sure 6Volts is enough to drive the NMOS to a really low resistance. Look at its data sheet, in the curves you will see ON characteristics for different gate voltages.
I suggest you get out of the circuit analysis program and try it understand the elements. The circuit analysis program will give you a false sense of progress.
2 Likes
Don’t know how to delete the post.
Thank you for the explanation, it is very help full !
I’ve solved the circuit but yes, it was necessary to understand how really works this elements and after start to burn nichrome.
1 Like
Just leave the post, it goes away after some months.
I green lighted the subject as the system held it. I could have killed it then but we try to be helpful to a point. No need to walk away with a bad feeling. If you continue to use Kicad you will probably want some clarifications on it in the future. Good luck with your project. 
Basically, we have been discussing this recently as a community and I believe this is the majority opinion on how to proceed with posts like these. Give a little help but don’t allow it to go too far off topic.
1 Like