Carbon Microphone Mounting

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Angus McCarthy
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Location: Bloomsburg, PA, USA

Carbon Microphone Mounting

Post: # 22223Unread post Angus McCarthy
Mon Dec 17, 2012 6:46 pm

Thought this'd be useful to some of us. I recently got ahold of an NOS double-button carbon microphone and needed to build a spring mount for it. I decided that instead of the traditional metal frame a slice of PVC sewer pipe would actually work much better - since this way the mic is completely insulated instead of dealing with a "hot chassis" frame and stand.

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Angus McCarthy
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Location: Bloomsburg, PA, USA

Post: # 22235Unread post Angus McCarthy
Wed Dec 19, 2012 6:46 pm

Trying to track down the proper pieces to build a power supply for this thing is giving me a headache. :x

If anybody knows where I can find a 400ohm/40Kohm transformer with a split-tapped primary (200+200) I'd be eternally grateful.

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markrob
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Post: # 22236Unread post markrob
Wed Dec 19, 2012 8:48 pm

Hi,

Given that the turns ratio is the square root of the impedance ratio, you would need a 10:1 transfomer. Since we are not talking Hi-Fi, I'd suggest using a small 2VA power transformer from Signal. The ST series parts are nice because they have dual secondary windings. So, you can get the center tap you need with the proper wiring.

The ST-2-12 has a primary of 120 Vac and a secondary of 12 Vac center tap if wired in series. Its available from Digikey for about $10

http://www.digikey.com/product-detail/en/ST-2-12/595-1159-ND/953029

I think this should work well for you.

Mark

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Angus McCarthy
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Location: Bloomsburg, PA, USA

Post: # 22239Unread post Angus McCarthy
Thu Dec 20, 2012 1:47 pm

Thanks Mark, I'll see how it works!

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