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Thread: Condenser Mic Innards?

  1. #11
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    It's my understanding that more than a few condensors require nothing like 48V to operate. Of course, buying the mic, they'll require phantom power, but that's standardized, so they're built for it.

    Besides, you're only really looking for a little bit of biasing voltage with nearly-trivial current with that tiny of a job, if you're dealing in solid state and not tubes. (a moment of silence <LOL>)

    So sure, it could be the elements you've found are rated for 5V (minimum) but will easily handle 48V because that's what the designer/manufacturer knows that they'll see. Drawing next to no current, it's easy to live in a higher voltage environment.

    Well.. unless they're specifically for USB mics, i guess.

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    Quote Originally Posted by arcaxis View Post
    Wasn't suggesting to use specific components, simply that the design would be similar to get from unbalanced to balanced and function off phantom without getting into a transformer on the output to couple and balance.
    Ah, right. Well yes the circuit is fine for balanced drive. Use an LM4562 and a couple of suitable transistors and it could be fine. Capacitor mic amplifiers are of course optimized for a very high source impedance and an input 10-20dB or more above a dynamic capsule.

    Dave.

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    Would the assembled board of a MXL990 work? I’ve replaced all the innards of these mics, the original boards are all intact.

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    Quote Originally Posted by ashcat_lt View Post
    Is that an offer?
    Yes, they’re free, you pay for shipping.

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    Well I sure do appreciate it. I still haven't gotten around to trying with the one I already have. If that one works, I'd imagine about any one would. I'm kind of looking to make more that a couple, though, and was hoping for a more reliable source than just donations and scavanged components. That's not saying I might not hit you up in a while.

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