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Your own audio isolator - Electronics Design
https://www.epanorama.net/documents/groundloop/audio_isolator_building.html
Building yourself an audio isolation transformers If you want to build one yourself, you have to get two audio transformers which have 1:1 transformation ratio and greater than 1 kohm impedance. There are high quality audio transformers in …
Audio Transformer, its Types and Impedance Ratio
https://circuitdigest.com/tutorial/audio-transformer
Audio Transformer uses this isolation property and creates isolation between the output speakers or audio circuitry with the transformer’s input side amplifier system. In such case, the primary and secondary winding turns ratio fixed to 1:1. Due to this, the transformer does not alter the voltage or current level.
Audio Transformers
https://www.jensen-transformers.com/wp-content/uploads/2014/09/Audio-Transformers-Chapter.pdf
The design of an audio transformer operating over a 20 Hz to 20 kHz frequency range is much more difficult because these elements often interact in complex ways. For example, materials and techniques which improve low-frequency performance are often detrimental to high-frequency performance and vice-versa.
Amazon.com: Audio Isolation Transformer
https://www.amazon.com/Audio-Isolation-Transformer/s?k=Audio+Isolation+Transformer
Audio Transformers - Learn About Electronics
https://www.learnabout-electronics.org/ac_theory/transformers04.php
Audio Frequency (AF) Transformers work at frequencies between about 20Hz to 20kHz and are used in audio amplifier circuits, they were essential in valve (tube) designs for matching the high impedance outputs of theses amplifiers to low impedance loudspeakers, but transistor amplifiers have much less need for output transformers.
Chapter 5: Understanding Impedance In Audio Transformers
http://www.lundahl.se/wp-content/uploads/datasheets/PSW_WhitePaper_Download_Chapter_5.pdf
ImpedanceIn Audio Transformers transformers provide galvanic isolation. It helps to think of a transformer as a lever. If the fulcrum is in the middle, like in a see-saw, than neither the voltage nor the current will alter from the primary to the secondary. Figure 1 depicts a 1:1 transformer.
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