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
