I needed a simple understanding of how this circuit works.



I understand everything about this circuit apart from the diode. I also know the function of the diode is to protect the transistor but from what exactly? Is it something to do with back EMF from the coil? I'm not too sure. Also I needed to confirm if the relay will function correctly with a 9V supply (regulated or unregulated). The datasheet of the relay is attached here and the part I'm going to use is '40.61' on page 20 of the datasheet.

Also any tips for making this circuit work more efficiently. Note I am going to use the relay for no more than 16A at 230VAC at 50Hz.

Thanks


Question: How svn checkout and checkin maven multimodule project
Answer: You must also mount the main project in eclipse, the parent of the module. Then, use this project to check in the new module as you are doing for any change set. This project is only used for SVN synchronization purpose. For your developments, use the module projects.

For your last question, this is a maven constraint to have its sub module below the parent project. You won't be able (at least not easily) to create a module somewhere, check it in below the parent and then checkout the whole project with the new module.

Try to keep it simple. 

Use the parent project when you want to synchronize new modules.

HIH
M.