Hi Alberto, The strange thing is that the system is working.... (your program is also running fine)
i tried several things without getting the temperature down.. - i have removed the bias circuit - is disable the chip by suppling +5V to the pin 1 en 15 (ENA and ENB) I found a difference in the QEX schemes : page 23 Mar/April and page 7 july/aug; The connections at the output side are different: 3-10; 4-11; 5-12; 6-13 (iam using this scheme) versus 3-13;4-12;5-11;6-10 Can that be a problem? Which connection is right? 73 johan PA3GSB --- In [email protected], Alberto I2PHD <[EMAIL PROTECTED]> wrote: > > johanmaas2001 wrote: > > > > The QSD uses a fst3253; the temperature of the chip is high (i can not > > measure the temp because i do not have a probe); i can not hold my > > finger on it.... is this normal behaviour? or is there something wrong? > > > There should be almost no power dissipation in the analog switches, > whatever model or brand they are. If yours get so hot that you can't > touch them, something is definitely not functioning as it should... > > 73 Alberto I2PHD > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
