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? asked in Science & MathematicsEngineering · 3 months ago

Why the diode across the transistor at 0:55?

It can't by a flyback for the primary cause when transistor is off there is no path for primary to close.

https://www.youtube.com/watch?v=0jWpQ8HEYgk

Update:

Also to add there is a version of the same circuit without a diode.

https://www.electro-tech-online.com/threads/flybac...

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