WB O2 testing

Tue Jan 15 00:06:04 GMT 2002

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Hello,
   I pressed forward with the WB O2 although no one was able to assist =
me in the previous questions I had in my original email. I powered up =
the heater circuit for the first time today using a 12v stop lamp as the =
heater. When I connect the leads to power, the stop lamp will instantly =
illuminate and stay on. I timed it, and it seemed to stay on for around =
30sec and then turn off. I would continue to wait for a total of 1 =
minute and the LED would never light up.
  U1 and R4 get extremely hot, which I assume is normal. I'm wondering =
if I perhaps have the LED backwards or if I've assembled the unit =
incorrectly. Like in my previous email, I stated that U1 has the metal =
heat sink side facing upwards (which i believe is correct) and the flat =
side of the LED is facing closest to the R4 side of the PCB.
  Perhaps I'm not waiting long enough for the LED to light up? I figured =
that when the stop lamp shut off, the LED should light up correct?

  Any assistance would be greatly appreciated. Thanks.

Crescent Kao
Director of Marketing and Sales
www.c-speedracing.com

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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hello,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp; I pressed forward with the =
WB O2=20
although no one was able to assist me in the previous questions I had in =
my=20
original email. I powered up the heater circuit for the first time today =
using a=20
12v stop lamp as the heater. When I connect the leads to power, the stop =
lamp=20
will instantly illuminate and stay on. I timed it, and it seemed to stay =
on for=20
around 30sec and then turn off. I would continue to wait for a total of =
1 minute=20
and the LED would never light up.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp; U1 and R4 get extremely hot, =
which I assume=20
is normal. I'm wondering if I perhaps have the LED backwards or if I've=20
assembled the unit incorrectly. Like in my previous email, I stated that =
U1 has=20
the metal heat sink side facing upwards (which i believe is correct) and =
the=20
flat side of the LED is facing closest to the R4 side of the =
PCB.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp; Perhaps I'm not waiting long =
enough for the=20
LED to light up? I figured that when the stop lamp shut off, the LED =
should=20
light up correct?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp; Any assistance would be greatly =
appreciated.=20
Thanks.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Crescent Kao<BR>Director of Marketing =
and=20
Sales<BR><A=20
href=3D"http://www.c-speedracing.com">www.c-speedracing.com</A></FONT></D=
IV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV></BODY></HTML>

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