I've built slayer exciter without LED. I was wondering if there is a way how to lighten a bulb without touching the secondary coil first. Also I was interested in how could I "upgrade" this slayer exciter to make it bigger and "stronger" so maybe I could see small lightning,now I see only sparkling.
Why did you build it without the LED (or any other diode)? That seems to be something a lot of people do for some reason.
It has a purpose in the circuit other than "lighting up" -- it provides the path for the secondary current when the lower terminal tries to go negative. Without it, that current is forced to flow through the resistor and the transistor BE junction (in reverse).