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Audio, Coupling, Telephony Transformers | Prem Magnetics
https://www.premmagnetics.com/audio-coupling-telephony/
Audio Transformers - Transformers - Power Products ...
https://www.alliedelec.com/transformers/audio-transformers/?keyword=audio%20transformers
Stancor - TTPC-2 - Transformer Audio Telephone …
https://www.alliedelec.com/product/stancor-ttpc-2/70213325/
Audio Transformers
https://www.jensen-transformers.com/wp-content/uploads/2014/09/Audio-Transformers-Chapter.pdf
Transformers always reflect impedances from one winding to another by the square of the their turns ratio or, expressed as a formula: Zp/Zs = (Np/Ns)2 where Zp is primary impedance, Zs is secondary impedance, and Np/Ns is turns ratio (which is the same as the voltage ratio).
Pulse Audio Transformers / Signal Transformers – Mouser
https://www.mouser.com/c/passive-components/audio-transformers-signal-transformers/?m=Pulse
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