In the below video is shown a very simple pancake coil circuit. Its biggest problem is the huge 5 watt power resister Is there a way or another NPN transistor I can use and get away from using the 5 watt resistor?
https://www.youtube.com/watch?v=4UmVLfFNx7U
https://www.youtube.com/watch?v=4UmVLfFNx7U
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