The jumper blocks reminded me of what I did to get the bias voltage out for the mic. I took a jumper block carefully cut with my Demel Tool through the short at the top and sweated soldered a SMD 1K resistor across the terminals. It prevents an accident short of the 5V from the mic and if it is shorted it only draws 5ma with a 25mW draw on the resistor. A better choice might be a 10K and that would only draw .5ma and 2.5mW. However, I have had no problem with the 1K SMD. This was done an experiment to try a cheap computer mic (which worked fine) I went back to my Heil Mic which I prefer and does not need bias.
73, Steve K4JPN Elecraft K2 S/N 1809 ______________________________________________________________ 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 Message delivered to [email protected]
