Photocoupler
This is a simple low-level noise maker that is ideal for some alarm circuits. When the sounder is built in another part of the building, the sound will be loud enough to be heard, but it is not loud enough to warn the intruder to leave.
Transformer For Renewable Energy
Transformer For Renewable Energy, Solar Transformer,Wind Mill Transformer, Energy Station
Hangzhou Qiantang River Electric Group Co., Ltd.(QRE) , https://www.qretransformer.com