Re: Electrets, Hey Scott
- From: kludge@xxxxxxxxx (Scott Dorsey)
- Date: 31 Aug 2005 08:30:05 -0400
Patrick Covert <cover@xxxxxxxxxxx> wrote:
>In article <df2rsl$l6m$1@xxxxxxxxxxxxxxxx>,
> kludge@xxxxxxxxx (Scott Dorsey) wrote:
>
>> >Failing that, would it be possible to
>> >convert them to externally polarized?
>>
>> Maybe. I tried to do this on some Japanese microphones from the early
>> seventies and I never had any luck with it, but in theory you might be
>> able to make something like this work. It won't sound the same, though,
>> because you won't necessarily have the same polarization that the original
>> electret had.
>
>So, what is it I'm not seeing when I look at the capsule? Looks pretty
>much like a standard brass capsule. Would the electret be the membrane,
>or the body?
The electret is the backplate, which is why strictly-speaking those
capsules are called "back-electrets."
Some early electret types used a thin ceramic electret as the diaphragm
itself. It was pretty high-mass, which meant the frequency response was
poor. This is much of why electrets got a bad reputation.
Some of these microphones are constructed with the diaphragm prestretched
and cemented onto a brass ring, so you can pop the diaphragm and ring
out (or unscrew it) to get inside the capsule. The SM-81 is a great
example of this sort of thing... the SM-81 capsule is designed to be repaired.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
.
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