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Old February 9th, 2011, 06:49 PM   #16
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Originally Posted by Steve House View Post
It's apparently originally intended for Canon's own accessory on-camera mic, which uses a proprietary double pronged plug. They used the two different prong sizes, 3.5mm for audio and 2.5mm for power, so the connector would be polarized and can't be plugged in backwards. Why they would do that rather than a conventional plug-in power arrangement is anyone's guess.
Thanks for that extra info, Steve. Having read that, I can come up with a few different theories.

1.) Perhaps they take power to the mic on a different conductor than the one used to bring back audio. That is really a better way to do it, from an electrionic standpoint... it allows them more leeway in where they set the operating point of the FET impedance converter, etc. (We'd need to find a schematic of the mic, or dissect one, to ascertain this.) Also, if the mic circuitry were designed well, this configuration would minimize the amount of electrical noise created by a slightly dirty connector.)

2.) Perhaps they keep the DC off the mic audio connector, so it's safe to use a dynamic mic without worrying that the DC would cause problems.

3.) Perhaps they just want to sell proprietary connectors and/or mics, by making it harder to use "standard" configuration mics. (I doubt this is the case with Canon, although Apple has certainly tried it and still does it on some of the iPud connectors.)

As you say... those are just guesses (but the first one is certainly valid from a technical perspective).
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Old February 9th, 2011, 11:04 PM   #17
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Originally Posted by John Isgren View Post
Have you considered the MA-300 and then use regular XLR connections?...
Maybe I should. I've wanted to be cheap about this, because these cams are going to be replaced. However, that doesn't help current students...

Of course the investment in the actual xlr cables & lavs would carry over to the next cams.
30 years of pro media production. Vegas user since 1.0. Webcaster since 1997. Freelancer since 2000. College instructor since 2001.
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