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DIY ribbon microphone preamp question
DIY ribbon microphone preamp question
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Old 13th June 2012, 12:26 PM   #1
efabric is offline efabric  France
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Join Date: Oct 2007
Default DIY ribbon microphone preamp question


I'm currently building a ribbon microphone with scavenged parts from everywhere.
I have a question about this preamp project : N1NKM's V4 'Delta' Ribbon mic page

I've never seen this kind of transistor configuration before. Is there a mistake in the mic preamp schematics ?

Thank you

P.S. I share my schematics and diy curation here :
DIY Music & electronics | Scoop.it
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Old 13th June 2012, 03:08 PM   #2
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
The first transistor is common base, and the second common emiter. I see no problem/issue.
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
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Old 14th June 2012, 08:30 AM   #3
Nigel Goodwin is offline Nigel Goodwin  England
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Join Date: Jul 2005
Location: North Derbyshire
Yes, it's a perfectly normal common-base configuration - it looks a bit weird because the transistor is drawn sideways.
Nigel Goodwin
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