Re: [Elecraft] Electret microphone for K3
Alan, With the K3, you do not need a bias resistor at all. Just go to the MENU MIC SEL and set it to aply bias - that is what the 'b' means. 73, Don W3FPR On 3/10/2017 5:49 PM, Alan. G4GNX wrote: Sometime back I bought a W2ENY electret conversion kit for my Astatic mic but I seem to have lost the bias resistor/jumper that came with it and there’s no value specified in the instructions. I see that the bias resistor used with the Elecraft MH2 microphone is specified as 5K6. As I want to use the (converted) Astatic with my K3, I wonder if this value seems sensible to maintain the correct bias and prevent max bias current going over 10mA? 73, Alan. G4GNX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to donw...@embarqmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Electret microphone for K3
It isn't a problem, because the FET preamplifier normally operates in the saturated region where it approximates a constant-current load, in effect drawing only the current that it "needs". Typically Idss will be only a few hundred microamps. With typical resistor values and supply voltages, neither value is critical. 73 from Ian GM3SEK >-Original Message- >From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of >Alan. G4GNX >Sent: 10 March 2017 22:49 >To: Elecraft Reflector >Subject: [Elecraft] Electret microphone for K3 > >Sometime back I bought a W2ENY electret conversion kit for my Astatic mic >but I seem to have lost the bias resistor/jumper that came with it and >there’s no value specified in the instructions. > >I see that the bias resistor used with the Elecraft MH2 microphone is >specified as 5K6. As I want to use the (converted) Astatic with my K3, I >wonder if this value seems sensible to maintain the correct bias and prevent >max bias current going over 10mA? > >73, > >Alan. G4GNX > >__ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:Elecraft@mailman.qth.net > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html >Message delivered to gm3...@ifwtech.co.uk __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Electret microphone for K3
Sometime back I bought a W2ENY electret conversion kit for my Astatic mic but I seem to have lost the bias resistor/jumper that came with it and there’s no value specified in the instructions. I see that the bias resistor used with the Elecraft MH2 microphone is specified as 5K6. As I want to use the (converted) Astatic with my K3, I wonder if this value seems sensible to maintain the correct bias and prevent max bias current going over 10mA? 73, Alan. G4GNX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
