David, It is not critical. Look at the reflector post by Jim Brown in the last couple days - I received it 01/15/2010 at 12:06 Eastern time. Jim is quite familiar with the microphone and explains it much better than I can.
73, Don W3FPR David Christ wrote: > I'm trying to understand the bias requirements for the CM-500 > specifically and electret/condenser (which is it) mikes in general. > > Yamaha's adaptor uses 3V (2 AAA batteries) in series with a 2.2K > resistor and a 1 microfarad DC blocking capacitor. I would rather > not depend on batteries. My reading of the KSB2 manual says to use > 10K fed from 5V while I have heard that it should be 10K for this > unit. I am not sure what my K3 is supplies. I would also like to use > the mike with a Kenwood TS-940. That rig has 8V available at the > mike connector. So if I build an adaptor to use with that rig what > is the proper value resistor to use? Or should I build a quickie 3V > regulator fed from the 8V and then use a 2.2K resistor? I presume I > would need some value of DC blocking capacitor for the Kenwood. > > How does one determine the proper voltages and resistance values? Is > it to get a specific voltage, current or what? How close do you have > to be or is it non-critical? What difference does it make? Where > can one find information? > > Thanks all from an old timer who is still trying to get up to date > from the dynamic and crystal mikes of the 60s and 70s. > > David K0LUM > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.725 / Virus Database: 270.14.145/2626 - Release Date: 01/16/10 > 02:35:00 > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
