Carbon Microphone Mounting
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- Angus McCarthy
- Posts: 760
- Joined: Mon Aug 23, 2010 6:22 pm
- Location: Bloomsburg, PA, USA
Carbon Microphone Mounting
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.
- Angus McCarthy
- Posts: 760
- Joined: Mon Aug 23, 2010 6:22 pm
- Location: Bloomsburg, PA, USA
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
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
- Angus McCarthy
- Posts: 760
- Joined: Mon Aug 23, 2010 6:22 pm
- Location: Bloomsburg, PA, USA