Transcription of Electret microphone replacement for a carbon insert
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Electret microphone replacement for a carbon insert
The VMARS Newsletter Issue 2914 June 2003 Electret microphone replacement for a carbon insertColin Guy G4 DDIWhen I found that I had a dud carbon insert in an H33F/PT handset, and I couldn t find another insert that fitted (theoriginal is about 1 diameter) I looked around for an alternative. Trevor Sanderson s excellent article The RAFM icrophone (Radio Bygones issue 79/80) makes reference to the use of Electret inserts with an IC preamplifier intelephones and aircraft headsets, but the information given was too scant to make construction of one of these possiblewithout reference to the IC data sheet, and the IC s are expensive and difficult to obtain.
The VMARS Newsletter Issue 29
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