98 Touchscreen edition Climate backlight
02-26-18, 03:05 AM
#16
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02-26-18, 04:45 AM
#17
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No, bulbs are not driven by a constant current source. The driver is a kind of variable voltage regulator which follows the rotating angle of the rheostat ***. When the *** is turned CW direction, the voltage is increased and the current is also increased. Thus the brightness is increased.
02-28-18, 02:08 AM
#18
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Ah, snap, that would have been too good to be true.
It looks like 8 V bulbs are practically unavailable in Europe. So we either have to settle with 12 V ones like in the evansweb post, or replace them with LEDs. Yamae, can you please tell a bit more about using LEDs to replace the bulbs? My primary concern is the mechanical fixing part, as a car is a relatively harsh environment in this regard.
It looks like 8 V bulbs are practically unavailable in Europe. So we either have to settle with 12 V ones like in the evansweb post, or replace them with LEDs. Yamae, can you please tell a bit more about using LEDs to replace the bulbs? My primary concern is the mechanical fixing part, as a car is a relatively harsh environment in this regard.
02-28-18, 03:36 AM
#19
Moderator
Ah, snap, that would have been too good to be true.
It looks like 8 V bulbs are practically unavailable in Europe. So we either have to settle with 12 V ones like in the evansweb post, or replace them with LEDs. Yamae, can you please tell a bit more about using LEDs to replace the bulbs? My primary concern is the mechanical fixing part, as a car is a relatively harsh environment in this regard.
It looks like 8 V bulbs are practically unavailable in Europe. So we either have to settle with 12 V ones like in the evansweb post, or replace them with LEDs. Yamae, can you please tell a bit more about using LEDs to replace the bulbs? My primary concern is the mechanical fixing part, as a car is a relatively harsh environment in this regard.
http://celsiorup.com/cgi/ita/itacel....ber=38932&no=0
LEDs have the polarity and you have to be careful to use them. Also you have to limit the current using a CRD for an each LED or a resistor. Due to the limitation of the space and the rheostat function, I haven't used any CRDs. Instead of using those, I simply added 3 resistors at X,Y and Z to the driver circuits after analysing the board. The purpose of the resistor at X is to set up the bright level of the top 3 LCD's back lights when tail lights are OFF, Y when ON and Z for buttons surrounding the navi's screen.
02-28-18, 09:43 AM
#20
Lexus Champion
Ah, snap, that would have been too good to be true.
It looks like 8 V bulbs are practically unavailable in Europe. So we either have to settle with 12 V ones like in the evansweb post, or replace them with LEDs. Yamae, can you please tell a bit more about using LEDs to replace the bulbs? My primary concern is the mechanical fixing part, as a car is a relatively harsh environment in this regard.
It looks like 8 V bulbs are practically unavailable in Europe. So we either have to settle with 12 V ones like in the evansweb post, or replace them with LEDs. Yamae, can you please tell a bit more about using LEDs to replace the bulbs? My primary concern is the mechanical fixing part, as a car is a relatively harsh environment in this regard.
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