DETEX 3000

[Emersonpaz]

Hello everyone, has anyone on the forum built this DETEX-3000? It works at a frequency of 80khz and has ground balance. apparently to be good for small nuggets.
I found this video on youtube here in Brazil Valdeni's channel details the construction and makes the files available for download.

https://www.youtube.com/watch?v=PwUqW6U1W6Q

operation

https://www.youtube.com/watch?v=rALqdVWZO9I