Hello, I am currently doing a project which consists of an 3v3 and 5V output PSU inside an 3 plug power cord supplied by 240 VAC outlet. The 3 plugs are connected in series with a coil relay each and the relays are driven by a rf bluetooth module (AMS001/S). When the RF module is driven by the PSU (3v3) inside the extension cord it acts extremely random and sends out arbitrary data. I believe this is because the 3v3 power line is extremely noisy due to the 240VAC powerline right next to it. Other rf modules work perfectly when connected to another PSU isolated from the 240 VAC powerline. I recently read this article (https://www.eetimes.com/document.asp?doc_id=1272268&page_number=2 ) Should decouple the 3v3 line with a parallel elyt.capacitor and a inductor with a specific value to reduce this powerline noise? The 3v3 voltage is driven by a TLV1117-3v3 IC which works perfectly in other projects.