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Audio line isolation transformer - Audio | Video | Circuits
https://www.epanorama.net/circuits/audio_isolator.html
The connection is easy: connect primary side of the transformer to one audio connector and secondary to other. I used EOP Z1612 transformers in my test circuit and got quite acceptable frequency response of +-1 dB from 40 Hz to 20 kHz as you can see in figure below. The bass frequency below 40 Hz is not good.
Audio Points & Coupling Discs - Soundstage Audio ...
https://soundstageaudio.com/audio-points-coupling-discs/
The Audio Points work in both directions. The sharp tips can face skyward or towards earth fitting into the APCD4-Inverted coupling discs. Tips pointing skyward provide one set of speed ratios for resonance flow and pointing them in the opposite direction delivers a slightly different speed.
Audio-Optical Isolation Amp - audioXpress
https://audioxpress.com/article/Audio-Optical-Isolation-Amp
This circuit enables the full galvanic isolation of sound frequency signals with optical transmission in excellent quality, eliminating interference. When you connect audio components, interference may occur from various power and signal grounds. For safety reasons, screenings are interconnected through the protection ground and the protection wire.
Audio Amplifier Circuit - UC Santa Barbara
https://web.ece.ucsb.edu/Faculty/rodwell/Classes/ece2c/labs/Lab%201a%20-%202C%202007.pdf
Choice of AC coupling capacitors ... Qty Description Circuit 1 Audio Speaker, 8-Ohm, 2 Watt, 0.3-9KHz 1 LM386N-3 Low-Voltage Audio Power Amplifer U2 ... isolation (the “free-air” response) will have a different impedance than one mounted in a wooden enclosure.
MT-071: Analog Isolation Amplifiers
https://www.analog.com/media/en/training-seminars/tutorials/MT-071.pdf
isolated isolation amplifiers: they almost invariably include an isolated power supply. The isolation amplifier has an input circuit that is galvanically isolated from the power supply and the output circuit. In addition, there is minimal capacitance between the …
Amazon.com: Audio Isolation Transformer
https://www.amazon.com/Audio-Isolation-Transformer/s?k=Audio+Isolation+Transformer
HiLetgo 5pcs EI14/EI-14 Audio Coupling Isolation Transformer Audio Transformer 600:600 1:1. 4.2 out of 5 stars 41. $5.99 $ 5. 99. Get it as soon as Thu, Feb 10. ... Install w/ RCA Jacks & Unique Noise Detection Circuit - Pyramid NS20. 3.7 out of 5 stars 376. $12.47 $ 12. 47 $19.99 $19.99. Get it as soon as Thu, Feb 10. FREE Shipping on orders ...
Isolation/coupling: basics? - Audiogon Marketplace
https://forum.audiogon.com/discussions/isolation-coupling-basics
Few inductors are used in today's audio circuits, but a defective one, with loose wire, could be microphonic. It is claimed that vibration degrades performance of digital equipment such as CD players. The mechanism for this degradation is supposedly errors in reading the digital data.
Chapter 13: Magnetic and Electrical Coupling and …
https://www.globalspec.com/reference/59939/203279/chapter-13-magnetic-and-electrical-coupling-and-isolation
Coupling of electric, magnetic, and electromagnetic fields from one part of a circuit to another is usually undesirable and can lead to many problems, such as noise injection, interference, instability through parasitic feedback, and transient ringing.
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).
Telephone interfacing circuits - Audio | Video | Circuits
https://www.epanorama.net/circuits/teleinterface.html
Modern hybrid circuits consists only of one audio isolation transformer, two operational amplifiers, resistors and some capacitors. and the most modern approaches try to avoid that transformer altogether by using active electronics circuits in telephone line side to do the job and optocouplers to do the isolation where needed.
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