Source google image: https://ae01.alicdn.com/kf/HTB1Qu3xKpXXXXbbXpXXq6xXFXXXm/Frequency-transformers-audio-coupling-isolation-transformer-1-1-600-600-hard-foot.jpg_640x640.jpg
Isolation transformer 1 to 1
Source google image: https://ae01.alicdn.com/kf/HTB1Qu3xKpXXXXbbXpXXq6xXFXXXm/Frequency-transformers-audio-coupling-isolation-transformer-1-1-600-600-hard-foot.jpg_640x640.jpg