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Guys, in this video we are going to see how to wind the toroid to assemble a blocking oscillator, which is better known as a joule thief. In the video we will only see how to wind it, we will not see the number of turns. In the next video we will see the circuit and do the tests. 0:00 Introduction. 2:12 Toroid measurements. 6:12 Winding model 1. 18:05 Winding model 2. 22:49 Deflector coil toroid. 26:09 Closing.