Quote:
Originally Posted by smoky
Hi Amigo, I think the diode is there to protect the transistor from blowing on the negative swing from the feedback coil's back emf. ie when the transistor is not conducting. They usually can only withstand about 6 volts or so of reverse bias (BVbeO)
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Thanks for the post. I did try adding the diode in the Joule Thief circuit mod but then it was not working or not working as intended (don't recall exactly).