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	Shure - Products
		Phantom power is a dc voltage (11 - 48 volts) which powers the preamplifier of a condenser microphone.
		Phantom power is normally supplied by the microphone mixer, but may also be supplied by a separate phantom power supply.
		Phantom requires a balanced circuit in which XLR pins 2 and 3 carry the same dc voltage relative to pin 1.
	www.shure.com /ProAudio/Products/us_pro_ea_phantom (568 words)

	Reference.com/Encyclopedia/Phantom circuit
		In telecommunication and electrical engineering, a phantom circuit is a circuit derived from suitably arranged wires with one or more conductive paths being a circuit in itself and at the same time acting as one conductor of another circuit.
		Here the phantom circuit is a third circuit derived from two suitably arranged pairs of wires, called side circuits, with each pair of wires being a circuit in itself and at the same time acting as one conductor of the third circuit.
		The "side circuits" within phantom circuits can be coupled to their respective voltage drops by center-tapped transformers, usually called "repeater coils" (or loading coils).
	reference.com /browse/wiki/Phantom_circuit (216 words)

	Phantom circuit
		In telecommunication, a phantom circuit is a third circuit derived from two suitably arranged pairs of wires, called side circuits, with each pair of wires being a circuit in itself and at the same time acting as one conductor of the third circuit.
		Note: The side circuits are coupled to their respective drops by center-tapped transformers, usually called "repeat coils." The center taps are on the line side[?] of the side circuits.
		Current from the phantom circuit is split evenly by the center taps.
	www.ebroadcast.com.au /lookup/encyclopedia/ph/Phantom_circuit.html (103 words)

	Transformers, Phantom Circuits and Repeat Coils
		This third circuit is known as the phantom and utilizes the two conductors of each of the two principal, or "side" circuits, as one conductor of the third circuit.
		With the side circuit conductors electrically equal, there can be no difference of potential between the mid-point of the repeating coil winding at one end and the mid-point of the repeating coil line winding at the other end because the drops of potential for the two parts of the side circuit are equal and opposite.
		The phantom is very sensitive to the slightest upset of this balance, and circuits that are sufficiently balanced to prevent objectionable crosstalk or noise in physical circuit operation, may not be sufficiently balanced for successful phantom operation.
	www.kadiak.org /tel/17-3.htm (1252 words)

	Chapter 18 - Characteristics of Circuit Facilities
		Phantoms are derived from wires 1-4, 7-10, 11-14, 17-20, and 5-6, 15-16.
		Similarly the characteristics of the "non-pole-pair" side circuits such as 1-2 or 9-10, with 12 inch spacing between wires, are slightly different from those of the pole-pair circuits like 15-16, where the distance between wires is 18 inches.
		Since the greatest crosstalk hazard is between the side and phantom circuits of a phantom group, it is desirable in many cases to dispense with the phantom circuit altogether.
	www.insulators.com /articles/openwire (1793 words)

	Phantom loop - Wikipedia, the free encyclopedia
		A phantom loop is a suitably arranged electrical network that includes within the number of conductive paths part of the natural environment (which can be at the same time acting as a conductor of another circuit) to complete a circuit.
		Phantom loops can occur in suspended circuits, in which the conductor has no ground and uses the ionosphere to complete the circuit at both ends.
		Phantom loops can also occur in grounded circuits, in which the conductor has a ground and uses the lower atmosphere to complete the circuit and both ends (with the waves traversing the magnetic poles of the Earth).
	en.wikipedia.org /wiki/Phantom_loop (222 words)

	Low Voltage Strip Lighting - Phantom Lighting System (Site not responding. Last check: 2007-10-08)
		The concept of Phantom is to eliminate wiring by using existing metal shelf standards to conduct a safe low voltage current.
		The Phantom Lighting system is an excellent choice for architectural coves which require continuous, dramatic lighting.
		Phantom also requires less space than traditional systems, allowing for a cleaner, tighter fit.
	www.phantomlighting.com /strip-lighting.htm (445 words)

	Powering microphones
		Phantom powering is now the most common microphone powering methid due to it being safe if a dynamic (moving coil or ribbon) microphone is accidently or purposefully plugged into a powered microphone channel.
		In practice this circuit seems at least to work on modern mixers, but I don't recommend this circuit for any real recording or PA application For any real use you are much happier with a better quality balanced circuit.
		This circuit gives out balanced signals and has around 2 kohms output impedance which enables it to be used successfully with mic cables of several meters or tens of meters.
	www.epanorama.net /circuits/microphone_powering.html (4005 words)

	[No title]
		The original "Phantom of the Opera" is a 1911 novel by Gaston Leroux, which is now in the public domain and therefore available for adaptation by anyone who chooses to make use of it.
		In this appeal, Phantom Touring contends that the district court's decision reflects the erroneous view that all of the disputed statements in the Globe articles were privileged under the First Amendment simply because they could be classified as opinion.
		Such, for example, is the language in "The phantom of the 'Phantom' " quoting a critic who described the Hill production as "a rip-off, a fraud, a scandal, a snake-oil job." Not only is this commentary figurative and hyperbolic, but we also can imagine no objective evidence to disprove it.
	www.kenhillsphantomoftheopera.co.uk /articles/article7.htm (3699 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		] Repeating coil used at a terminal of a phantom circuit, in the terminal circuit extending from the midpoints of the associated side-circuit repeating coils.
		Group of four open-wire conductors suitable for the derivation of a phantom circuit.
		Three circuits which are derived from simplexing two physical circuits to form a phantom circuit.
	www.accessscience.com /Dictionary/P/P17/DictP17.html (1536 words)

	Frequently Asked Questions - Phantom Lighting System (Site not responding. Last check: 2007-10-08)
		Yes, all Phantom Lighting installations require the use of a 12 or 24 volt magnetic transformer to conform to ETL standards.
		Phantom Lighting is fabricated to the exact length of the application, which provides for smooth continuous mood lighting.
		Phantom Lighting can be wired in a number of ways and we would be happy to answer any questions that you might have.
	www.phantomlighting.com /faq.htm (2406 words)

	Uneeda Audio - Phantom Powering for Condenser Microphones
		Technically speaking, phantom powering refers to a system where the audio signal is applied to the balanced line in differential-mode , and the DC power is applied common-mode .
		For phantom power purposes, what usually happens is that the FOH mixer gets a direct feed from the microphone and the monitor mixer gets a transformer-isolated split (in reality, a parallel feed) from the mic.
		When the mixer that isn't supplying phantom has it's inputs 'backwashed' with phantom power, the regulator doesn't quite know how to deal with this voltage coming at it from what it thought was its output.
	www.uneeda-audio.com /phantom (3042 words)

	Frequency-response curves
		circuit is limited by the reactive elements (capacitance and inductance) in the circuit.
		The phantom circuit elements representing the capacitance and inductance of the wiring are: L1, L2, C4, and C5.
		In view (A) a transistor is shown with phantom capacitors connected to represent the interelectrode capacitance.
	www.tpub.com /neets/book8/31b.htm (1015 words)

	FET Preamp Cable
		The Preamp Cable is "phantom powered", meaning that the power to drive the preamp circuitry shares the same wire (the same piece of copper) as the audio signal.
		The circuit is simliar to the left half of the circuit in my Discrete FET Preamp article.
		Phantom powered preamps have been around for a very long time so the basic technology is not new, and this application is pretty much exactly what phantom power was designed for in the first place, but this specific implementation has some innovative details.
	www.till.com /articles/PreampCable (2439 words)

	Teletypewriter
		A teletype circuit could be neutral, meaning off-on and independent of polarity (direction of current flow), or else polar, when the two states corresponded to opposite directions of current flow.
		Ground return circuits suffer from line leakage (to ground), wet-dry effects (because of insulation resistance and leakage), and induction from power lines, neighboring circuits, and earth currents due to ionospheric effects.
		Phantom circuits were common for telephones as long as pole lines existed.
	www.du.edu /~jcalvert/tel/teletype.htm (2866 words)

	Group DIY - Power Supplies
		The phantom may be a little low at 36 volts but you can add an extra 9 volt battery to bring it up to 45volts with dry cells and perhaps a little more with some of the NiHD batteries.
		This is the circuit diagram of a voltage tripler.
		The phantom power circuit I like is 52volts feeding a 0K5 to 1K0 ohm series resistor that dumps into a 47mF/63vdc cap that filters to ground.
	recording.org /users/kev/PS.htm (2762 words)

	Balanced Line Driver & Receiver
		The shield serves the same function in an unbalanced circuit, but is less effective due to the fact that it usually serves as the signal return path, and any signal that does get through becomes part of the signal.
		The circuit is designed to send the maximum level possible across the balanced cable, and most of the attenuation is performed at the receiver.
		We could use conventional phantom feed (using a 48V supply), but it is easier to use a differential feed, with the +ve and -ve supply voltages on the signal leads.
	www.sound.westhost.com /project51.htm (1870 words)

	The Phantom Circuit
		Hopefully this discussion will not only familiarize the reader with the phantom circuit but also vividly present a picture of just how much could be done with the "primitive" technology of the past.
		If the earth is used to complete the circuit, it is possible to add a second function, such as a Morse telegraph line, to the single telephone pair without affecting the operation of the telephone circuit.
		If a telephone company was not happy with a gain of one circuit from two pairs, they could always take two phantom circuits, additional repeat coils and "phantom the phantoms" to obtain seven circuits over four pairs of wire.
	www.telephonecollectors.org /singwire/phantom/phantom.htm (692 words)

	Peterson Tuners Forum 2006 - what's "gound lift" and "ground attached"
		Phantom power's current is way too low to power something like the StroboStomp.
		Standard Phantom Power circuit is usually between 7mA and 14mA.
		It does not harm the StroboStomp if there is Phantom switched on that channel, the Phantom Power is simply rejected.
	www.petersontuners.com /forum/topic.asp?TOPIC_ID=1562 (132 words)

	F/VESCO Microphone Specials (Site not responding. Last check: 2007-10-08)
		The ATM-10A operates on battery or phantom power and has super low sensitivity to popping and overload making it the ideal microphone for group vocals, strings, cymbal overheads, acoustic guitar, piano and interviews.
		Phantom (12 48V) or battery powered (1 x 1.5 V AA size).
		The unit will pass the phantom voltage from the main source to the microphone on the direct out.
	www.fvesco.com /microphones.htm (761 words)

	Phantom Power Supply Circuit
		Here is a simple phantom power supply that uses a voltage doubler circuit so that a commonly available low voltage transformer (such as a Radio Shack 273-1366A) can be used to produce 48 to 52 Volts DC.
		Please Note: It is a good idea to add a series current-limiting resistor between the voltage-doubler circuit and the input of the LM317T regulator as is now shown in the modified circuit diagram below.
		Simply replicate the circuit for each mic input and bus the +48VDC (+) and common (-) connections together (and connect these to the 48-52 VDC power supply).
	members.nuvox.net /~zt.robgrow/circuits/powersupply/phantompower.html (255 words)

	Video amplifiers
		As you have seen, the capacitance of an amplifier circuit and the interelectrode capacitance of the transistor (or electronic tube) cause the higher Frequency response to be limited.
		Peaking coils can be added to a circuit so they are in series with the output signal path or in parallel to the output signal path.
		With the exceptions of the "phantom" capacitor and the inductor, the components in this circuit are the same as those in figure 2-6.
	www.tpub.com /neets/book8/31c.htm (877 words)

	Uneeda Audio - Uneeda Audio? We do Audio!
		Phantom powering is a system for remotely powering condenser microphones via the same lines used by non-powered microphones.
		Phantom powering is provided for condenser microphones, and everything is DC blocked to prevent loud pops if the a/b switch gets operated with the mixer input live.
		There may be a way to do this using the phantom supply from the mixer, but I had an idea for an instant solution (instant from my perspective), and if someone wants to pay me to research the other solution, then that's what will have to be done.
	www.uneeda-audio.com /#phantom (2462 words)

	New Line: Phantom Supply
		The official Phantom supply is as follows: 48V, fed through 2 resistors, each 6k81 in value.
		Now since the question was for a simple phantom supply, fed by batteries, the choice was made to use 2 9V batteries (since a lot of microphones can be run from phantom voltages as low as 10V).
		R2 and R3 couple the phantom voltage to both the positive and negative leg of the balanced connection.
	www.new-line.nl /default.asp?i=61 (1312 words)

	ACEE Lesson Page
		However, such circuits exist in abundance and in various disguises such as DC motors, relays, and electromagnets--any circuit that has a DC current passing through a coil of wire.
		Series RL circuits are most often equivalent circuits, or circuits that present a simplified and more manageable view of an actual circuit.
		When DC power is removed from a series RL circuit, the magnetic field that had been built up around the inductor begins to collapse.
	www.free-ed.net /sweethaven/ModElec/acee/lessonMain.asp?iNum=0401 (549 words)

	PSW Recording Forums: Klaus Heyne's Mic Lab => Any detriment to 48v phantom on dynamics?
		In general, properly implemented phantom powering can't damage (or restrict the audible performance of) a dynamic microphone that has a balanced output when correctly wired, balanced cables are used.
		Tube condenser microphones generally have output transformers and their powering is carried on separate wires from the audio signal, so phantom powering applied to their modulation leads should have no effect, as long as the output transformer isn't having the type of problem that Oliver Archut talks about (insulation breakdown).
		Yes indeed, normally it is OK to use phantom with ribbons, but there are some cases, when you can make the ribbon element work as a fuse; or if there were no grill, with amusement (until you actually understand what just has happened) watch it flying over your head.
	recforums.prosoundweb.com /index.php/m/41489/0 (903 words)

	Bleau.info : Areas : Rocher Canon : sub 7 outside the circuits
		n°7 Bis of the Phantom Circuit ED- "Idées Noires".
		n°26 of the Phantom Circuit ED- "Idées Noires", in the overhang of the bivouac.
		n°16 of the topo of Phantom Circuit ED- "Idées Noires".
	bleau.info /canon/sub7.html (429 words)

	[No title]
		Current through that circuit energized a solenoid that held the coins as they were deposited.
		A technician at a given location would be instructed over the broker's phone to short the leased lines together and to earth-ground (a water-pipe, say).
		At the computer site, a simple ohmmeter was used to measure the "loop resistance" wire-to-wire and then the "phantom ground" resistance referenced to electrical "neutral" in the building basement.
	www.niquette.com /puzzles/ohmsqp.htm (585 words)

	48V Phantom Feed Supply for Microphones
		Another version of phantom supply (reasonably common) uses an oscillator and voltage multiplier to provide the 48V (or thereabouts) supply, but these are not suitable (IMO) due to very poor regulation and an inherent inability to provide enough current.
		The circuit is shown in Figure 1, and as described avove, uses a voltage doubler rectifier.
		The standard value of 6.81k (0.1% tolerance) for phantom feed circuits can be reduced to 6.8k (a standard E12 series resistor value), and I suggest that using a multimeter to match the resistors to at least 0.1% is the easiest and cheapest alternative.
	sound.westhost.com /project96.htm (2315 words)

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