Source google image: https://img.alicdn.com/imgextra/i3/3159605094/TB2wZK2rZtnpuFjSZFKXXalFFXa_!!3159605094.jpg
1 kw isolation transformer
Source google image: https://img.alicdn.com/imgextra/i3/3159605094/TB2wZK2rZtnpuFjSZFKXXalFFXa_!!3159605094.jpg