Convert 6 volts dc to 300 volts dc
Convert 6 volts dc to 300 volts dc. What is the most efficient way to do this.


1 minute on google found this: -



This will be about 70% efficient and probably a bit more efficient than using a 555. Read the data sheet on the LT3573 for detail on what transformer they recommend.

Then there is this beast: -



I used the term "5V to 300V converter" to search for images and note that I changed 6V to 5V because it is more likely to lead to a better search result. You'll also need to be able to generate 300V as the batteries droop a bit too.