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Old 18th August 2008, 02:25 AM   #1
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Default Calibration mic (or parts for one)

I'd like to buy an inexpensive calibration microphone, or parts for one. I've had a great deal of trouble finding any WM-61A capsules, and I have a feeling I'd likely make a hash of removing the internal FET if I did.
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Old 18th August 2008, 03:09 AM   #2
bwaslo is offline bwaslo  United States
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why do you want to remove the FET?
I have some capsules if you need one.
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Old 18th August 2008, 05:15 AM   #3
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Quote:
Originally posted by bwaslo
why do you want to remove the FET?
I have some capsules if you need one.

The internal FET, according to Sigfried Linkwitz, severely limits the performance of the microphone element. I wouldn't know, but Linkwitz is probably as good a source of info as any.
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Old 18th August 2008, 08:52 AM   #4
Shaun is offline Shaun  South Africa
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The biggest performance gain of SL's mod is max SPL. It is not done by removing the FET, but by reconfiguring the connection (cutting a track). It is very delicate work, but do-able.
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Old 18th August 2008, 07:39 PM   #5
zlast is offline zlast  United States
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Default WM-61A

bwaslo - your email is not enabled. How much for a WM-61A ? Digikey has them but has a $25 minimum order.
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Old 18th August 2008, 09:55 PM   #6
bwaslo is offline bwaslo  United States
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The FET is the limiting element, but that doesn't mean it can work without one. (Like, a battery is the limiting element of a flashlight, but because it's not enough, not too much!)

The Linkwitz mod is good, but not easy to do. If you are only measuring frequency response at normal listening volume (and not right at a speaker cone) it isn't needed, though. The mod increases signal handling and lowers distortion (but raises noise level), the frequency response isn't affected.

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