Hi guys,
I built one of the versions of the Wart zapper designed by Thomas Scarborough. I was very skeptical it will work, but the diagram is simple and I had all the components. The MOSFET did not work properly, the oscilloscope showed poor response at the drain. I improved it a bit by connecting a resistor (10k...20k?) between the drain and node R4-VR1. Changing the MOSFET had a significant effect in the amplitude of the pulses, but it was still not high enough, so I replaced the mosfet with a bipolar transistor (2N2222) with a resistor in the base. The pulses were approx 24V, with a sharp rising edge and not very good falling edge. Because I didn't think this voltage was likely to cause much harm, I had VR1 set at low value. I applied the voltage on my index finger (back of my hand) using the blunt end of a needle. I had a very small wart, approx 0.5mm in diameter for approx 10 years. Soon I felt some stinging sensation on the skin and I kept the electrode touching the skin, waiting for the pain to dissapear. I must admit it felt pretty bad, but I ignored the pain. After about one minute (?), I removed the needle from the skin. Unfortunately I realised too late that the needle head moved approx 2mm away from the wart. The skin got a red tint, approx 3 mm in the next minutes. For a whole month after the experiment I had a pretty severe burn on the back of my finger. At some stage it was swollen and painful and it got infected. I squeezed out the infection and in about two weeks the sore healed.
It is now about two months later and I still have a visible spot on the skin. I will probably have a 2-3 mm tiny mark there for the rest of my life. Checking with a magnifier I can see the tissue regenerating like after a burn. The wart is still present, but it seems to have been affected as well. I might give it a try in a few months, but this time I will be a lot more cautios. So, I can't tell you if the device removes warts, but I can advise you to be very cautious and not overdo it. It is very easy to get severe burns if the 24V pulses are applied on a small area of skin. By the way, I used a frequency counter to set the frequency to 21.27kHz. The ceramic capacitors can have high dispersion and I used a ceramic trimmer in parallel with C2 to finely adjust the frequency. Good luck, if you dare
PS - I just posted this comment on Thomas Scarborough blog, I am curious if he will publish it, since it is clearly not positive.