Uploaded November 2022 | Updated September 2026, 1 hour ago
Let's make a simple trip wire alarm using Copper wire.
Firecrackers or buzzers can be connected as needed.
0.1mm nichrome wire was used to ignite the fireworks.
Let's make a simple trip wire alarm using Copper wire.
Firecrackers or buzzers can be connected as needed.
0.1mm nichrome wire was used to ignite the fireworks.
![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)









