---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 03/29/20: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:49 AM - Re: Headset repair (Richard Gent) ________________________________ Message 1 _____________________________________ Time: 10:49:25 AM PST US From: Richard Gent Subject: Re: AeroElectric-List: Headset repair Don't mean to but in but I was given this web site when I was looking for a mike replacememt. Got the mike real fast.Give them a shout=C2- www.kchea dsets.comDick -----Original Message----- From: Robert L. Nuckolls, III Sent: Tue, Mar 24, 2020 11:49 am Subject: Re: AeroElectric-List: Headset repair At 07:12 PM 3/23/2020, you wrote: Busting open the mic cartridgereveals this. The tiny mic component has 55DK 02 stamped on theside.=C2- With o-scope leads across the terminal, I'm no t able to getany response by speaking into it. =C2-=C2- I'd bet that 99.999% of all microphone elements =C2-=C2- in common service are of the 'electret' variety. =C2-=C2- Easy to make, rugged, can be very small . . . but =C2-=C2- this comes with a price. =C2-=C2- Special attention needs to be paid to smooth =C2-=C2- frequency response and minimize distortion. Qualities =C2-=C2- of concern for 'high end' mic manufacturers (studio =C2-=C2- quality recordings). Many high-end microphones =C2-=C2- still exploit legacy technologies to achieve =C2-=C2- the desired performance. =C2-=C2- But the great unwashed, 'communications =C2-=C2- grade' microphones will use this technology. https://tinyurl.com/k59r249 =C2-=C2- These critters need to be biased at something =C2-=C2- on the order of 2-4 volts. In aircraft microphones, =C2-=C2- getting this bias is no big deal . . . aircraft =C2-=C2- audio systems EXPECT a carbon microphone analog, =C2-=C2- their design includes a bias network to supply =C2-=C2- voltage to the microphone. =C2-=C2- So your experiment to exercise the microphone =C2-=C2- while observing output on a 'scope would =C2-=C2- not yield useful information unless you =C2-=C2- implement the necessary external bias =C2-=C2- supply. =C2- Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.