Here's another way to blow U1 - turn off the agc and tune across a very loud signal.
As I have said before, the audio amp should not be this fragile. It needs better protection. Dave Hachadorian, K6LL Yuma, AZ -------------------------------------------------- From: "eric manning" <[email protected]> Sent: Thursday, February 25, 2010 8:25 AM To: <[email protected]> Subject: [Elecraft] K3 Configuration - No mono plugs in the stereo spkr jack! > > DO NOT, repeat NOT, plug a mono plug into the stereo speaker > jack on the > back of your K3. > > The manual says that the microprocessor firmware will switch > the audio > to SPKRS 1, which it will. > > However, if there are other events queued up for the cpu to > process, it > may take some milliseconds, during which time > > the shorted output may blow the audio amp, which is chip U1 of > the DSP > board. {What is the audio output doing on the DSP board instead > of the I/O board? - but that's > another story} > > You then get to replace the DSP board - like I did - which is > good fun but a fair amount of effort. And it costs the company > $. > > eric > > VA7DZ > > > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > ______________________________________________________________ > 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
