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<DIV><FONT face=Arial size=2>Hi, Charlos and All !</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I used to add two components to my constructions to
avoid such troubles.</FONT></DIV>
<DIV><FONT face=Arial size=2>Just a fuse and a suppressor (something like
1,5KE15 will do the trick for 12V PS)</FONT></DIV>
<DIV><FONT face=Arial size=2>or high power zenner diode (with 15-25% higher
voltage then the nominal PS output).</FONT></DIV>
<DIV><FONT face=Arial size=2>This will also protect your equipment from
the applying power with reverse polarity...</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I often see this in the commercial equipment
too.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Good luck!</FONT></DIV>
<DIV><FONT face=Arial size=2>Oleg</FONT></DIV>
<DIV><FONT face=Arial size=2>73 de UR3IQO</FONT></DIV></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=pa3ckr@yahoo.com href="mailto:pa3ckr@yahoo.com">Charlos Potma</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=hpsdr@hpsdr.org
href="mailto:hpsdr@hpsdr.org">hpsdr@hpsdr.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, June 10, 2008 10:57
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [hpsdr] How to fry
Penny/Ozy</DIV>
<DIV><BR></DIV>***** High Performance Software Defined Radio Discussion List
*****<BR><BR>
<P>
<HR>
<P></P>Hi All,<BR><BR>Last night one of my old and trusted HP power supplies
failed in a spectacular way:<BR>the output voltage went from 12V to 40V. The
result was a sputtering and<BR>smoking Penny output stage, popped capacitors
on Atlas and<BR>some components damaged on the Ozy board.<BR>Lesson learned:
do NOT trust your power supply. I need to build<BR>a dedicated supply now with
overvoltage protection on all outputs...<BR><BR>73, Charlos Potma, PA3CKR<BR>
<P>
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