IEC 61938 PDF


IEC Standard | Audio, video and audiovisual systems – Interconnections and matching values – Preferred matching values of. However it might be better to be aware of such defects rather than oblivious of them. Parallel powering is covered by section of the. IEC standards. IEC Multimedia systems – Guide to the recommended characteristics of analogue interfaces to achieve interoperability.

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This article is provided by Behind The Mixer. A eic variation of the usual XLR connectoriwc XLD connectormay be used to prevent accidental interchange of analog and digital devices. This Indian Standard which is identical with lEC This arrangement was later standardized in DIN It is often used for powering electret microphoneswhich will not function without power.

These are readily available commercially, or alternatively are one of the easier projects for the amateur electronics constructor. Also, be aware of Bias power, also known as plug-in power. The International Electrotechnical Commission Standards Committee’s “Multimedia systems – Guide to the recommended characteristics of analogue interfaces to achieve interoperability” IEC Many mixers and recorders intended for that market have a T-power option.

Baggs ParaDI, for exampleand these may not work with lower voltages. In addition to powering the circuitry of a microphone, traditional condenser microphones also use phantom power for polarizing the microphone’s transducer element.

Phantom Power | Radio Design Labs

Mids and later condenser microphones designed for volt phantom powering often require much more current e. Many mixer boards have a switch for turning phantom power on 661938 off; in most high-end equipment this can be done individually by channel, or on smaller mixers all mic channels can be either on or off, also this can be done in groups in most mid-range boards and some smaller ones.

Ribbon mics usually used only in studios can 6198 damaged by phantom power if a cable is mis-wired. The first known commercially available phantom-powered microphone was the Schoeps model CMT 20, which came out inbuilt to the specifications of French radio with 9—12 volt DC phantom power; the positive pole of this powering was grounded. There are three possibilities for this damage to occur. This standard is also available to be included in Standards Subscriptions. Phantom power should be assigned to only the channels that need it.


The two cannot be interchanged. Lifting the ground, which is normally pin 1, breaks this path and disables the phantom power supply. When in doubt, consult your instruction manual or get in touch with the manufacturer. Other microphones are specifically designed to switch over to the internal batteries if an external supply fails, which may be useful.

IEC – Standards Australia

Since NRK already had 48 V 6193 in their studios for lec emergency lighting systems, this voltage was used for powering the new microphones model KM 84and is the origin of V phantom power. For other uses, see Phantom Power disambiguation. T-power, also known as A-B powering [14] or T12, described in DINis an alternative to phantom powering that is still widely used in the world of production film sound.

Digital interface handbook third edition. Most ground lift switches have the unwanted effect of disconnecting phantom power. However, in some mixers, phantom power is assigned to a group of channels, such as, etc.

Eic is in contrast to microphones with vacuum-tube circuitry, most of which require special, multi-conductor cables.

P12, P24 and P The volt version of phantom powering, proposed quite a few years after the 12 and 48 V versions, was also included in the DIN standard and is in the IEC standard, but it was never widely adopted by equipment manufacturers. By using this site, you agree to the Terms of Use and Privacy Policy.

Everything You Need to Know About Microphone Phantom Power

There is a common belief that connecting a dynamic or ribbon microphone to a phantom-powered input will damage it. Connecting a conventional microphone to an input that had parallel powering enabled could very well damage the microphone.


It is not a standard for defining performance characteristics. Some circuits also have significant additional resistance in series with the standard pair of supply resistors for each microphone input; this may not affect low-current microphones much, but it can disable microphones that need more current.

In fact, phantom power supplies have current limiting which prevents damage to a dynamic microphone even ifc it is shorted or miswired. It is also defined in IEC You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. Some DIs or preamps can be powered by phantom power the popular L.

The Sound Reinforcement Handbook. Phantom isc is sometimes used by workers in avionics to describe the DC bias voltage used to power aviation microphones, which use a lower voltage than professional audio microphones.

These same cables will also be used to pass the audio back from the microphone. When sound hits the capsule, the variation between the space produces an electrical signal which represents the sound detected. Rolling your own dual source pickup system can be daunting, and requires planning out your entire system. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.

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Need more than one copy? Bias power can be used by internal guitar mics and wireless systems. A frequent source of confusion for guitarists is that some microphones use oec powering schemes. One such approach is known as bias power—also called plug-in-power.

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