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Registered Member #4118
Joined: Mon Oct 03 2011, 04:50PM
Location: MD
Posts: 140
You can use uf4007s. They'll be more efficient than 1n4007s. For the transistor I'd use a MOSFET, but add some sort of protection so it doesn't get fried from overvoltage.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Without series resistance at the HV output the discharge/spark current may be too high for the diodes. With series resistance the spark will not be impressive.
This is why stun guns use a pulse transformer output.
I've built something similar. I made a simple 555 driver, one that would activate a speaker, attached it to a pot for one of the resistors, and crazily lowered the values of the pin 3 resistor and the pin 7-8 resistor. Instead of attaching the output to a speaker, I attached it to a small transformer with calculated increase of 30 times on the secondary. I was able to get 1.5V on the primary from 9V, and an output of around 23-60V AC at a pretty high frequency on the other. IDK if my meter read right, but it said 38kHz or something. The driver is pretty similar to your low voltage side of your driver.
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Mini HV generator
