There is indeed dc on the 5kA phones output. When I plug in a headphone I hear a loud pop (almost to the level it makes me think it'll be blown).
I asked once why on earth this is needed, and got the answer that blocking this DC (by transformers or capacitors) would also block the lowest audio frequencies. I simply don't use the headphones output. BTW: I never heard that high end audio required our equipment to run DC through our voice coils. Rob, PA3CNT 2014-11-23 5:06 GMT+01:00 Bill Guyger via FlexRadio < flexradio@flex-radio.biz>: > Forgot to add grab a voltmeter and check for DC > > Bill > > Sent from my iPhone > > > On Nov 22, 2014, at 10:04 PM, Bill Guyger via FlexRadio < > flexradio@flex-radio.biz> wrote: > > > > Heating in headphones and speakers is usually caused by D.C. coming out > of the amp. I underline usually maybe something I'm not considering > though..... > > > > Bill AD5OL > > > > Sent from my iPhone > > > >> On Nov 22, 2014, at 8:27 PM, Mike Sonn <fatfend...@sbcglobal.net> > wrote: > >> > >> Anyone else use earbuds? I've used a set for years with my Flex 3000. I > >> now have upgraded to a FLEX 5K and when I stuck my earbuds in for the > >> first time, they were very warm. I thought I had them leaning against > >> something warm in the shack, but after sitting on the desk for 10 > >> minutes, they are still warm. My ear canals won't get cold, but > >> clearly, there's something strange going on here. Any ideas? > >> _______________________________________________ > >> FlexRadio Systems Mailing List > >> FlexRadio@flex-radio.biz > >> To opt out of the Reflector: > >> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > > > _______________________________________________ > > FlexRadio Systems Mailing List > > FlexRadio@flex-radio.biz > > To opt out of the Reflector: > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > To opt out of the Reflector: > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > -- Rob Keijzer PA3CNT _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz To opt out of the Reflector: http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
