[simpits-tech] Resistor for LEDs?
Rick Centeno
simpits-tech@simpits.org
Fri, 27 Dec 2002 17:51:26 +0100
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I have been calculating roughly the required current for my F16 cockpit, =
and am kind of bewildered.
If you use only the indicator lights, you can easily count about 30 to =
35 leds you will have to mount. Each of which requires 20mA, i.e. which =
leads to some 0.6 to 0.7 A flowing through your EPIC card (32point) and =
simulator. Assume you are using a 12V supply this means you need at =
least a 9W capable supply.
If you also would include all backlighting, the additional amount of =
leds would become about 50 to 80 (ICP buttons alone is 20 leds). This =
means you would need an additional 10W supply for your backlighting to =
work (at 12 V).=20
So in total I guess I would need about 20W of power to supply to the sim =
to make all leds and backlighting work.=20
NOw my questions is this: how to divide this power over the system? =
Should I buy two separate 10W power supplies each running either the =
notification lights and the backlighting, or would it be better to buy =
one big supply, stabilised, to provide enough output to both systems?
Finally, would any of you have recommendations on how to wire the 20 =
leds in the ICP? SHould they go in serial (i..e one fails, all goes =
black, but we would need at least a 24V supply, running 20 mA) or in =
parallel (a 5 V supply would do fine, just one resistor, but needs 400 =
mA to supply to the system).
Thanks for all feedback.
Kind regards,
Rick "Drummer" Centeno
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<DIV><FONT face=3DArial size=3D2>I have been calculating roughly the =
required=20
current for my F16 cockpit, and am kind of bewildered.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>If you use only the indicator lights, =
you can=20
easily count about 30 to 35 leds you will have to mount. Each of which =
requires=20
20mA, i.e. which leads to some 0.6 to 0.7 A flowing through your EPIC =
card=20
(32point) and simulator. Assume you are using a 12V supply this means =
you need=20
at least a 9W capable supply.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>If you also would include all =
backlighting, the=20
additional amount of leds would become about 50 to 80 (ICP buttons alone =
is 20=20
leds). This means you would need an additional 10W supply for your =
backlighting=20
to work (at 12 V). </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>So in total I guess I would need about =
20W of power=20
to supply to the sim to make all leds and backlighting work. =
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>NOw my questions is this: how to divide =
this power=20
over the system? Should I buy two separate 10W power supplies each =
running=20
either the notification lights and the backlighting, or would it be =
better to=20
buy one big supply, stabilised, to provide enough output to both=20
systems?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Finally, would any of you have =
recommendations on=20
how to wire the 20 leds in the ICP? SHould they go in serial (i..e one =
fails,=20
all goes black, but we would need at least a 24V supply, running 20 mA) =
or in=20
parallel (a 5 V supply would do fine, just one resistor, but needs 400 =
mA to=20
supply to the system).</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Thanks for all feedback.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Kind regards,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Rick "Drummer" =
Centeno</FONT></DIV></BODY></HTML>
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