Uploaded November 2020 | Updated September 2026, 1 hour ago
I made a dog-repeller device using 30kV high voltage generator.
It does not work for some breeds.
I made a dog-repeller device using 30kV high voltage generator.
It does not work for some breeds.





![12V car bulb connect to 220V directly
This is series capacitor current limit circuit. Widely used in transformerless power supply.
However, it is dangerous because of the high potential difference with the ground.
In this kind of circuit, may damage the bulb by over current flows due to harmonics. (Current : 2 × π × f × C × V [A] ) 12V car bulb connect to 220V directly](https://i.ytimg.com/vi/4HI3JEzjyu8/mqdefault.jpg)




