DIY-WB LED problem
Crescent Kao
crescent at c-speedracing.com
Sun Jan 20 05:35:57 GMT 2002
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Hello,
I recently ordered the LED Jaycar display for the WBO2 project.
http://www.techedge.com.au/vehicle/wbo2/wbfmd.htm
I just completed the assembly and tested the circuit following the =
testing procedures. With 12v applied, I get 5v at pin 4 and 14 on IC1.
I then soldered in the 1.8k resistor to pin 9 and REG1. The display =
shows "LO" and the center LED on the bar graph is lit. I then applied =
1.4v using a battery and connected it to the sensor input and ground. =
Regardless of how I adjust VR3, the display never changes and would =
always show "LO" and the center LED on the bar remains lit.
I then tried 3.2v at the sensor input and the same thing happens if I =
adjust VR2.. the display doesn't change.
I'm stuck and don't know what the problem may be.. any insight on this =
problem would be greatly appreciated. Thanks.
Crescent Kao
Director of Marketing and Sales
www.c-speedracing.com
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<DIV><FONT face=3DArial size=3D2>Hello,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> I recently ordered the LED =
Jaycar=20
display for the WBO2 project.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><A=20
href=3D"http://www.techedge.com.au/vehicle/wbo2/wbfmd.htm">http://www.tec=
hedge.com.au/vehicle/wbo2/wbfmd.htm</A></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2> I just completed the assembly =
and tested the=20
circuit following the testing procedures. With 12v applied, I get 5v at =
pin 4=20
and 14 on IC1.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> I then soldered in the 1.8k =
resistor to pin 9=20
and REG1. The display shows "LO" and the center LED on the bar graph is =
lit. I=20
then applied 1.4v using a battery and connected it to the sensor input =
and=20
ground. Regardless of how I adjust VR3, the display never changes and =
would=20
always show "LO" and the center LED on the bar remains lit.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> I then tried 3.2v at the sensor =
input and=20
the same thing happens if I adjust VR2.. the display doesn't=20
change.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I'm stuck and don't know what the =
problem may be..=20
any insight on this problem would be greatly appreciated. =
Thanks.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV> </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> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV></BODY></HTML>
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