A flyback circuit uses the flyback transformer from a TV or computer monitor to generate high voltage for ignition. It's one of the more complex ignitions to build, but the hot, continuous arc makes it very reliable.
The image on the right shows perhaps the most basic flyback driver that can be built. There are a few improvements that can be made though:
- Remove the 27Ω resistor, it gets very hot and also seems to limit the output voltage.
- Use a better transistor, the 2N3055 is not well suited for this.
The circuit can be powered by a 9V battery, but it will be weak and won't last long. It's better to use a RC battery pack or other rechargeable batteries. 12V is a good input voltage.
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