Original Circuit
http://www.zen22142.zen.co.uk/Circuits/Misc/wart_zap/wart_zapper.htm
https://www.instructables.com/Electronic-Wart-Removal-8211-No-Blood-Little-/
Perfect article:
Commercial Unit: https://wartabater.com/?msclkid=e942f6f6bbc41ecb4d5c977eb50c21f4