EI28 Permalloy Audio Transformer 600:600 Ohm 1:1 Audio Isolation Transformer DIP Through-Hole Product Overview The EI28 Permalloy Audio Transformer is a 600:600Ω, 1:1 audio isolation transformer designed for professional and commercial audio applications. With a high-permeability Permalloy core and reliable DIP through-hole construction, it provides stable signal transmission, effective noise isolation, and good audio performance. Designed as a cost-effective alternative to