Sorry, but the only solution to keep the two outputs isolated is to provide two audio output jacks, one for left and one for right. AND have a appropriate limiting coupling cap or series limiting regulator for the amp. IMHO.
Mel, K6KBE On Tuesday, January 14, 2014 6:13 PM, Dave Hachadorian <k6ll.d...@gmail.com> wrote: Putting a mono plug into the stereo jack is not the ONLY failure mechanism for the speaker amplifier chip. It was not the cause of failure of my two K3's. I'm not sure anyone fully understands the failure mechanisms in the speaker amplifier. The new $2.36 mod adds 1 ohm resistors in series with the audio output channels. Hopefully that will do some good. Dave Hachadorian, K6LL Yuma, AZ -----Original Message----- From: Don Wilhelm Sent: Tuesday, January 14, 2014 5:10 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 - No speaker output Dick, If you have an early K3 *and* you plugged a mono connector into the rear speaker jack, one channel was shorted by the mono connector. That will cause failure of the audio amp for the speaker. Later K3s (I don't know the serial number) have protection for that shorting condition. The best protection is not to put a mono plug into the speaker jack. If you want mono, cut off the mono plug and connect only the tip and shell to your speaker - the ring does not connect to anything. 73, Don W3FPR On 1/14/2014 6:55 PM, Richard Solomon wrote: > Can someone explain to me exactly why the chip failed, and what > the Audio > Protection Assembly is for ? > > Tnx, Dick, W1KSZ > ______________________________________________________________ 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 ______________________________________________________________ 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 ______________________________________________________________ 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
