新手提问，闪字灯箱，关于加电阻的。

是不是灯的数量够多就可以不用电阻？

通常不建议采用，电压波动时影响稳定，红色不超过115个，蓝色不超过73个，绿色不超过80个；而且都需要加电阻的哦！

非常感谢2楼老师的回复。

:D 客气了！
3# tghksj

通常不建议采用，电压波动时影响稳定，红色不超过115个，蓝色不超过73个，绿色不超过80

学习，学习.........再学习！

学习了 那么白   黄  怎么加啊

[whitepad]***400;200;400,200;;** m37,57 l45,57,49,56,54,56,58,54,62,53,65,52,67,51,70,50,72,48,74,47,76,45,82,42,84,40,84,39 e|********* m16,112 l19,111,30,111,34,110,49,110,52,109,56,108,60,105,75,96,78,91,82,86,88,82,93,78,101,70,111,64,116,60,121,58,125,55,127,53,130,52,132,50 133,50,135,49,137,49,140,48,144,47,147,45,151,45,154,43,156,43,156,42,154,43,148,47 e|********* m63,73 l63,94,62,98,62,133,63,136,63,146,64,148,64,151,65,152,63,152,54,148,42,142,37,138,32,135,31,134,42,134,51,132,54,130,62,124,76,112,79,106 81,103,84,97,84,94,86,90,90,78,92,74,93,71,95,66,95,64,96,62,97,57,98,54,98,32,96,26,96,24,95,23,95,21,93,19,93,18,91,16 88,16,88,19,91,29,94,41,95,48,97,52,98,56,99,58,99,60,100,61,103,69,105,73,106,78,107,80,108,83,108,87,109,89,110,90,110,92,112,94 115,100,117,102,119,106,121,108,123,112,123,113,124,115,125,116,126,118,128,120,130,124,132,125,133,127,133,128,134,129,135,132,136,134,138,136,139,138,143,142 144,144,146,146,148,150,150,152,151,154,155,158,156,160,159,163,160,165,164,169,167,171,170,174,172,174,173,172,173,168,172,164,172,154,171,145,171,141,170,134 169,130,168,127,166,124,165,123,165,109,162,106,160,103,157,99,157,98,156,98,153,96,150,95,148,94,148,96,143,109,134,128,116,145,112,149,103,155,98,158 98,139 e|********* m119,5 l120,6,124,9,129,13,133,18,137,22,140,27,142,30,143,31 e|********* m245,17 l246,21,248,27,252,43,254,47,254,49 e|********* m248,26 l249,25,250,25,251,24,252,24,255,23,256,22,259,21,260,20,262,19,263,18,265,17,266,16,268,16,268,46,263,46,259,45,256,42,253,40,251,39,250,38 253,38,254,37,256,37,257,36,259,36,260,35,262,35,263,34,264,34,265,33,264,36,263,40,263,47,261,48,263,48,268,46,271,46,270,49,260,59,218,66 214,69,208,70,205,71,200,72,205,72,207,71,210,71,214,68,221,57,225,52,232,47,234,45,236,44,237,42,240,41,241,40,253,40,257,42,259,44,261,45 261,47,262,47,264,46,265,46,266,45,265,45,263,47,261,55,261,79,263,82,263,85,264,85,265,84,270,83,280,76,286,72,288,71,290,69,289,69,287,70 283,71,273,72,251,69,240,66,231,63,231,62,233,62,233,96,232,98,233,99,233,100,232,100,231,101,226,108,225,108,223,106,221,101,221,87 e|********* m224,67 l228,67,231,68,235,69,249,76,256,81,260,83,261,84,262,84,262,85,263,85,265,87,267,88,274,93,283,96,285,97,288,98,292,98,296,99,345,99,344,100 e|********* m205,127 l206,126,214,126,217,128,220,128,222,129,223,130,225,130,226,131,225,134 e|********* m204,146 l205,145,208,145,210,144,216,142,220,141,223,140,225,138,228,137,229,136,232,136,233,135,234,135,233,137,230,142,222,150,219,151,211,159,211,171,221,171,224,170 226,169,229,168,230,167,232,166,234,164,237,163,238,161,240,160,241,159,243,159,243,158,245,156,242,156,226,148,225,147,225,166,224,170,224,179,225,181,225,193 224,193,217,192,209,190,207,188,205,187,203,185,207,185,209,184,214,183,217,182,219,181,223,178,228,173,230,172,230,171,231,170,232,168,233,167,235,166,235,165 245,155,246,153,248,150,251,146,255,144,260,141,262,140,263,139,265,139,266,138,267,138,264,136,252,121,249,114,247,112,247,111,246,109,247,114,247,117,248,123 248,142,247,147,247,153,246,157,246,176,250,176,256,174,260,173,266,172,280,172,281,173,281,184,278,188,275,191,271,193,265,195,260,196,253,199,251,199 e|********* m290,126 l299,126,308,123,311,121,313,119,315,118,315,117,317,115,316,115,315,117,306,130,303,133,302,135,300,137,308,137,313,136,314,135,317,135,317,137,316,139,315,142 311,146,305,148,301,148,299,149,297,151,295,151,293,152,291,152,289,153,287,153,284,154,286,154,289,153,291,153,295,152,297,152,298,151,300,150,303,150,304,149 308,149,309,148,311,148,312,147,314,147,318,145,320,145,323,144,324,143,326,143,327,142,330,141,332,141,332,140,328,139,314,132,312,130,311,130,311,150,313,156 313,167,314,169,314,176,315,178,315,181,316,182,316,186,313,186,309,185,306,185,302,183,300,183,300,182,299,182,296,181,295,181,293,179,291,178,289,176,289,173 288,172,288,170 e|********* m340,38 l344,38,345,37,347,37,348,36,350,36,352,34,355,34,356,33,358,33,358,32,361,32,362,31,364,31,366,29,368,28,368,27,370,25,373,25,374,24,377,24 377,23,373,23,372,25 e|********* m368,30 l367,31,367,35,365,42,358,58,357,62,356,65,354,67,352,71,351,74,351,76,350,77,350,79,347,82,345,77,343,63 e|********* m362,39 l362,71,363,80,363,82,365,86,364,85,358,76,353,65,353,60,354,59,354,58 e|********* m356,58 l370,58,375,60,378,61,380,63,381,63,382,64,383,64,383,65,385,65,386,66,387,66,389,68,393,70,395,70,395,71,396,71,393,72,391,73 e|********* m332,122 l339,122,341,123,342,125,346,129,347,131,348,132,350,132,350,133,353,133,354,134,363,134,364,133,365,133,369,129,371,128,372,127,373,125,374,125,374,124,372,122 367,119,365,118,358,116,356,116,356,115,355,115,355,166,356,168,356,172,355,168,354,165 e|********* m371,101 l376,101,382,98,384,98,388,96,394,94,388,94,382,91,379,90,376,90,376,92,380,104,378,96 e|********* m384,87 l384,107,383,108 e|********* m378,109 l385,109,389,108,392,108,392,107,391,107,389,109,377,117,368,122,362,123,368,123,376,121,383,119,391,118,393,117,395,117,398,116,396,118,380,122,377,123,376,124 375,124,375,144,376,150,376,152,377,152,378,153,375,151,372,146 e|********* m372,139 l373,138,375,138,376,137,378,137,379,136,391,130,392,130,392,142,391,144,391,146,390,147,390,148,389,151,389,152,385,152,383,150,380,148,379,147,378,147,378,146 382,145,384,145,387,144,390,142,389,142,388,144,383,147,382,148,392,148,390,147,384,143,382,141,381,139,381,138,380,137,380,149,381,150,381,170,379,170,376,167 373,165,370,164,368,162,368,161,369,160,374,159,376,158,378,158,383,156,384,156,385,155,386,155,386,156,384,162,380,170,379,171,377,174,372,177,371,178,365,180 364,180,366,179,372,179,374,178,378,178,380,177,383,177,385,176,386,176,385,177,399,177 e[/whitepad]

加电阻可保证电路的稳定性，给灯珠增加一道保险