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Old 11th January 2007, 05:30 PM   #1
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Default electret impedance converter

Dear All,

I'm not really sure if this is the right place to ask, but here goes. I am building a microphone based on an electret capsule which does not have a built in fet impedance converter. I have looked for a supplier of a suitable part in the UK, but have as yet found no one who stocks one. I have been basing my search on the NEC 2SK1109 which is designed for this application, but any JFET suitable for this purpose would be acceptable.

can anyone help?

Thanks

James
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Old 11th January 2007, 11:12 PM   #2
moamps is offline moamps  Croatia
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Join Date: Oct 2002
Location: Croatia
Hi James,

First, welcome to the forums.

I think 2sk30 from Toshiba is a good candidate for an impedance converter. I think I saw them being used in some condenser microphone designs like this one
http://www.akg.com/mediadatabase/psf...89ac4d79f7.pdf

Regards,
Milan
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