You don’t add it, but the capacitor exists naturally there. T: my hand made transformer I showed in the video.Q: 2N2222, or 2N5550 or similar regular NPN with >50V VCE and >60 hfe.The way the transformer needs to be connected, by showing those transformer dots.Also in case of a Tesla coil the toroid on the top helps with creating this capacitance. With primary of 10 turns (could be fewer depending on where you connect the wires) and secondary of around 750 turns. You might want to watch the video which inspired me here to see how Ludic Science made his own. You can add more transistors and reduce R to make the circuit drive stronger. Q turns on and drives current into the primary of the transformer.Turning the circuit on, R drives the base of the transistor Q. The secondary voltage wants to grows large.The created magnetic field drives the secondary of the transformer.The current is limited by the limited available base current. Diode D prevents the base voltage to fall more than 0.7V below ground, which in return pushes the output end of the secondary high.īut the tiny stray capacitance on the output resists the change, although very small, against the rise of the output end and so in return the voltage on the other end of the transformer goes down, pulling the base of the transistor low.The transistor turns off and so the magnetic field starts to reduce.The base voltage rises again and Q turns on and the cycle repeats.Slayer Exciter simulation done by LTSPICE I was able to simulate this in LTSPICE as shown in the figure below, of course the simulation result is a very rough estimation of the truth as I didn’t exactly know the transformer properties or the output capacitance value. There are a few things I learned in the process, such as the fact that it is very important for the oscillation frequency to be exactly at the output tank circuit (L-C) frequency for maximum power output. The greatness of the Slayer Exciter is that it makes the circuit oscillate exactly at that frequency.īut I tried to use a function generator instead to excite the circuit which is another option.

Slayer exciter with mosfet