Audio isolation transformer, Coupled Inductors, power transformer - tatanh1983/conchodom GitHub Wiki TGM Series 198 uH 100 mOhm 3 Watt SMD DC/DC Converter Isolation Module https://www.futureelectronics.com/p/passives--transformers--signal-magnetic-transformers--lan/tgm-h281nfrl-halo-electronics-2958718