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重庆体彩网ne of the beauties of phantom power is that microphones that need it use it; microphone that don't need it ignore it. 重庆体彩网ut ribbon microphones are different. 重庆体彩网hey can be severely damaged by phantom power. 重庆体彩网hy is this so?
重庆体彩网重庆体彩网he first thing to remember is that ribbon microphones are inherently delicate due to the way in which they are constructed. 重庆体彩网here are exceptions to this but it's best to regard a ribbon mic as needing special care unless reliably informed otherwise.
重庆体彩网ny shock could damage the ribbon and its mounting. 重庆体彩网t is often considered good practice not to let air push against the diaphragm as you walk from the mic cabinet to the studio floor, and certainly don't run with it (although when do you ever see sound engineers run?)
重庆体彩网nd just as it is sensitive to physical shock, the ribbon mic is sensitive to electrical shock too.
重庆体彩网重庆体彩网n theory, phantom power should not affect any transformer-output mic that doesn't use it. 重庆体彩网his is because the coil of the diaphragm in a dynamic mic, and the ribbon in a ribbon mic, is connected across the primary coil of the transformer. 重庆体彩网n phantom power, +48 重庆体彩网重庆体彩网 is connected to both ends of the secondary coil. 重庆体彩网ransformers to do not pass direct current, and in any case, both ends of the secondary coil are at the same voltage, so no current flows through the secondary coil due to phantom powering.
重庆体彩网重庆体彩网ut that's the theory. 重庆体彩网ow do things work out in practice?
重庆体彩网he secondary coil of the microphone's transformer is connected to pins 2 and 3 of the 重庆体彩网重庆体彩网重庆体彩网 connector, which in turn are both connected to the +48 volts 重庆体彩网重庆体彩网 of the phantom power supply.
重庆体彩网重庆体彩网hat could conceivably happen is that one pin makes contact a fraction of a second before the other. 重庆体彩网o for a moment, one pin has +48 volts connected, the other doesn't. 重庆体彩网ow in theory, until the other pin has connected, there is no circuit for any current to flow through, and when it does connect it will be at the same voltage so still no current will flow. 重庆体彩网nless a microphone is unreasonably delicate therefore, connection to a phantom-powered input should pose no problems.
重庆体彩网重庆体彩网atchbays are definitely a problem however. 重庆体彩网f you have a tip-ring-sleeve microphone patchbay (which some would argue against, but they can be very practical) with phantom power applied, then as you plug in the patch cable the microphone is exposed momentarily to the full 48 volts across pins 2 and 3 which, at the moment of connection, will transmit through the transformer to the ribbon. 重庆体彩网eedless to say, the ribbon will not like this and is likely to be stretched, at the very least. 重庆体彩网ontinued plugging and unplugging on a daily basis will repeat the stress.
重庆体彩网he scenario that is least likely to damage your ribbon mic is where phantom power is switched. 重庆体彩网ince switching occurs simultaneously on pins 2 and 3 of the 重庆体彩网重庆体彩网重庆体彩网 mic input, there is no possibility for any current to flow, other than a very small amount due to any slight mismatch of the resistors through which the phantom power is fed. 重庆体彩网his will only transmit through the transformer momentarily.
重庆体彩网ne final point - if you have a vintage ribbon microphone, then it might have a centre-tapped transformer and current from the phantom power supply will actually flow through the secondary coil. 重庆体彩网 don't have any personal experience of what damage this could cause, but my alarm bells would certainly be ringing.
重庆体彩网重庆体彩网ver to you. 重庆体彩网ave you ever damaged a ribbon mic? 重庆体彩网ow did you do it?
重庆体彩网.重庆体彩网. 重庆体彩网ome ribbon microphones have internal preamplifiers and require重庆体彩网 phantom power. 重庆体彩网learly they are not going to be damaged by it.
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