Hi, I'm new to the list. Most friends suggestion I put my question on it for answering. A]Why we don't use flyback transformer other than Tesla coil to produce HV ? It seems to has more efficienct as the front is made of ferric coild. B] What is the newer development to wounding a flyback? C] What shall I pay attention to wounding a more power flyback? Look forward to your helping. Zhao