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Telephone line audio interface circuits - Audio | Video
https://www.epanorama.net/circuits/teleinterface.html
The simple things are that the telephone line is a balanced transmission line which can have up to 120 ma of DC current from up to 56 VDC (actually in some cases up to 90 VDC) and up to 120 VAC RMS (ring voltage) in the way of various voltages and currents. ... In those cases the audio signal is passed from telephone line through the capacitor ...
Audio Signal Levels Explained: Mic, Instrument, Line, and ...
https://www.blackghostaudio.com/blog/audio-signal-levels-explained-mic-instrument-line-and-speaker
Figure 2:-10 dBV line level consumer gear vs. +4dBu line level pro audio gear. If you’re working solely with pro audio gear, most of it likely calls for a +4 dBu line level signal, but some pro audio gear might have a switch that allows you swap inputs between a …
Is an analogue audio signal DC or AC? - Factual …
https://boards.straightdope.com/t/is-an-analogue-audio-signal-dc-or-ac/474740
However, audio and radio signals carried on electrical wires are also examples of alternating current. ... “AC” to many folks means 120 volts AC 60 Hz. It’s more common to just refer to audio signals as “audio” instead of trying to call them AC or DC. ... All wave tables used 0 volts as the bottom line of the graph.
VAC Master Line Stage | Scott Walker Audio
https://scottwalkeraudio.com/brands/vac/vacpreamps/master-linestage/
As in the Statement Line Stage, the volume control is a massive custom-made, multisection, 2.2 kg brass volume control with internal brass shielding. Remote-control capability is implemented via a VAC-designed motor drive system, which allows continuous control of infinite resolution. All of the hand-wired Class A1 audio circuits are carried on ...
310-MV, 310X-MV and 310-MV-MNC - Federal Signal …
https://www.fedsig.com/resource-document/file/9316
Nominal operating voltages include 120/240VAC, 50/60 Hz and 24VDC. Voltage changes for the 120/240VAC are internally switch selectable and the AC line is fused with a 1/2 amp 250 volt type GMC fuse. The unit also offers internally selectable balanced or unbalanced line operation, transformer isolated audio inputs and internally
Virtual Audio Cable (VAC) - connect audio applications ...
https://vac.muzychenko.net/en/
Virtual Audio Cable (VAC) is an audio bridge between applications that transmits sounds (audio streams) from app to app, from device to device. VAC creates a set of virtual audio devices . Each device simulates an audio adapter (card) whose output is internally connected to the input, making a loopback.
Description - Virtual Audio Cable (VAC) - connect audio ...
https://vac.muzychenko.net/en/description.htm
On a computer with no audio adapter (card), you still can use VAC to record audio signals produced by applications (for example, on a remote server). Control panel application VAC Control Panel application allows you to change number of Virtual Cables , view/modify VAC driver and cable settings, watch for cable/stream activity.
VAC - Master PreAmp
http://www.vac-amps.com/productPages/masterPreAmp.html
All of the hand-wired Class A1 audio circuits are carried on machined, mass-loading plates, which are decoupled from the main chassis. This projects solidity in detail and imaging while reducing microphony to infinitesimal levels. You’ll find the “naked” z-foil resistors and premium transformers from the Statement Line Stage.
Alternating current - Wikipedia
https://en.wikipedia.org/wiki/Alternating_current
Audio and radio signals carried on electrical wires are also examples of alternating current. These types of alternating current carry information such as sound (audio) or images (video) sometimes carried by modulation of an AC carrier signal. These currents typically alternate at higher frequencies than those used in power transmission.
capacitor - Why put a resistor in series with signal line ...
https://electronics.stackexchange.com/questions/7709/why-put-a-resistor-in-series-with-signal-line
Consider the case where a field switch at the end of a long run of shielded cable, has a hot and a return conductor. the other end of the cable pair has a 120 vac Line and the return side goes to the input of a PLC, DCS, or other digital device.
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