EI-14 Audio Transformer, 5 pcs/Pack, 10K:600 Ohm Impedance, Isolation Coupling XFMR

stands obelisco here with a little explanation of a topic covered in my book teach yourself electricity and electronics all editions cover this topic I'm looking at the fifth edition right now that's edition number five in which transformers and impedance matching are discussed in chapter 18 which begins on page 304 and I have created here a generic diagram of a transformer with a powdered iron core you can tell it's a powdered iron core because of these two dashed lines between the turns dashed lines means a powdered iron core if they were solid lines they would be laminated iron if there were no lines at all it would be an air core coil a powdered iron core is commonly used in an audio frequency or AF transformer for the purpose of matching impedances well I suppose they're not used as often these days now that everything can be put onto a single integrated circuit chip in your entire