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How to Connect two or more transistors in parallel While making power electronic circuits, configuring the power output stage correctly becomes very crucial. These stages primarily may consist of power devices like the power transistors or MOSFETs. Using power transistors are more common due to the greater ease of  configuring them. However when higher outputs are desired, it becomes necessary to add more number of these devices together. And as per the rules, it becomes necessary to connect them in parallel. Though using transistors in electronic circuits is pretty easy, connecting them in parallel needs some attention due to the one significant drawback with transistor characteristics. As per transistor specs, the devices needs to be operated under reasonably cooler conditions and that's why we install heatsinks on them to maintain the above criterion. Moreover, transistors have the "bad habit" of conducting proportionately rising currents through them as they get heate...

Polygon can be used for various purposes, for example: We can draw large signal areas by using it in any shape. or we can use it to fill the empty pcb area with copper, to make it look more professional. For 1 st purpose make a board in eagle, give name to the signal (as -ve in below fig). Now draw the poly gon (as i mentioned in my previous article) and give it the same name i.e., -ve. The result is like this: You can see the –ve signal and polygon merges together. For 2 nd option, just change the name of polygon (say Vcc) without changing the signal name. After doing this you will find this: Both the signals are separate. So, you can easily find the difference between these two.