-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Paul Christensen Sent: Monday, July 06, 2009 12:13 PM To: [email protected] Subject: Re: [Elecraft] K3 Audio Low Pass Filter
>And that jumps to ~ 200 Hz if you use 8-ohm cans. If you stay cognizant of >the headphone Z, you're in good shape. If you want to pull a set of Koss >Pro4 AA phones off the shelf, you may want to revisit that. It's all about >the series C and knowing the headphone Z as a function of frequency. It's >doubtful your 27 ohms headphones remain 27 ohms across their frequency >range. Actually its 100Hz for 8 ohm cans because of the 8.2ohms inside the K3. >Speaking of robust, when I started discussing the matter with Lyle many >months ago, I was concerned that increasing the C value above 10 uF at >C9/C13 would begin to introduce switching thumps that would become apparent >especially in CW. Stated another way, I was hopeful that the small C size >was not masking keying artifacts that were there all along, only to be >discovered by increasing the cap size! But at 330 uF, I hear no artifacts >as a result of the change. Good to know!!! ______________________________________________________________ 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 ______________________________________________________________ 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
