I am developing my own PLC that is powered off a 24VAC transformer that is shared with a thermostat and some other controller devices. I wanted to isolate the 24VAC going into my PLC to protect it and I’ve been trying to find some small isolation transformers to attach to my PCB. I found a link off aliexpress for a cheap audio isolation transformer:


Can I use this to isolate the 24VAC? How can I derive the max amps and power loss from the values given by the seller?

Images attached:

  1. I am currently using a half wave rectifier
  2. I was going to configure the isolation transformer
  3. Here is what the audio isolation transformer on my PLC will look

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