** บทความและโครงงานนี้เป็นความคิดเห็นของผู้เขียนเอง ซึ่งผู้อ่านไม่จำเป็นต้องเห็นด้วยเสมอไปครับ
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กลับหน้าหลัก บทความ
 

??????? ??? ????????????? LED


LED (light-emitting diode) ??????????????????????? ???????????? ???????????????????????????? LED ????????????????????? LED ?????????????????????? ???????????????????? ??????????????????????????????????????? ????????????????????????????????????? ????LED??????????????????????????????????????????????????????????? ?????????????????????????????????????

LED???????????????????? ??????????????????????????????? ??????????????? ????? ??????? ???????? ????? ??????? ?????????? LED ??????????????? 3?????????, 5?????????,8?????????,10????????? ???????

LED ??????????????????? ??????????????????????? LED??????????????? ????????????????????????????????????????????????? ??????????????????????????????????? ??????? LED ??????????????????? ??????????? ???????????????????????? ??????? ????????? ???????? ????? ????? ???????

LED ?????????????? ???????????????????????????????????

LED ?????????????????????????? ???? 4 ?? ???????????????????????????? ????? ????????? ??????? ????? ????? ???????


???????????? LED


???????????? LED
LED ??????????????????? P ??? N ??????? 2 ????????????? (??????????????? ???? LED ?????????????????????????????????? 3 ?????) ???????? LED ???????????????????

?? A ??????????????????????? ????? ??????????????????????? (+) ???????????
?? K ????????????????????? ?? ????? ??????????????????????(-) ???????????
?????? LED ????????????????????????????????????????? ???????????????????????????????????????? K ??? ??????????????????????????????????????????????????????????????? ???????????????????????????????
????????????????????LED?????????????????????????? 1.5 ? 3????? ????????????????????????????????????????????? ????????????????? 2.5 - 3 ????? ??? LED ????????????????(?????????????)????????? 20 mA(?????????)

??????????????? LED
????????????????????? LED ????????? ???????????????????????????????????????????????????????????? ??????????????????????????????? ?????????? LED ?????????????????

?????????? LED


??????????????????????? ???????????????? LED ??????????????? 2V ??? ??????????????????????? 20 mA ???????????????????????????????? ???????? ?????????????? = (??????????????? ? ?????????????LED) / 0.002 (0.002 ??? 20mA)
????????
?????????????? 5 V ???????? R = (5 ? 2) / 0.02 = 150 ?????? ?????????? 150 ?????
?????????????? 9 V ???????? R = (9 ? 2) / 0.02 = 350 ?????? ?????????? 350 ?????
?????????????? 12 V ???????? R = (12 ? 2) / 0.02 = 500 ?????? ?????????? 500 ?????
?????????
?????????????? (?????)
3V
100 - 200
5V
150 - 250
9V
350 - 450
12V
500 - 1K


???????????????

??????????????? LED ???????????????? ??????????????????????????????? ????
???????????? 2 ??? ????????????????????????????? 4V
???????????? 3 ??? ????????????????????????????? 6V
??????????????????? 2 ?????????
?????????????? 5 V ???????? R = (5 ? 4) / 0.02 = 50 ?????? ?????????? 50 ?????
?????????????? 9 V ???????? R = (9 ? 4) / 0.02 = 250 ?????? ?????????? 250 ?????
?????????????? 12 V ???????? R = (12 ? 4) / 0.02 = 400 ?????? ?????????? 500 ?????
** ??????????? ??????????????????????????????????????????????????????????????? LED ???????????????????????????????????????????????? ** ????????????????????????????? ??????????????????????????????? ??????????????? 2.5 ? 3V

?????????? LED ?????????????????????????????????
??????????????????????
??????? ???????????????????????? LED ??????????????????????? LED ??????????????????????? ???????????????????????????? A K ??????????

??????????????????????????

???????????????????? ??? ??? ???????? ???????????????? 1 ????????????????? ??????LED ???????????????????? 2 ????????????????
????? 1 ???????? ??? 1 ????? ??????? LED ???? ??? ??????????? LED ????????????????????(+) ?????????? A ?????????????????(-) ?????????? K
????????????? 2 ????????? LED ???????? ???????????????


???????????????????????????? ????????????????????????????????????????????????LED ?????????????
?????????????????????????????

?????? ???????????????????????????????????????????? X1 ?????????????????????????? LED ??????????????????? ????????? LED ????? 1 ??????????? 1 ???????????? LED ???? ?????????????? ????? LED ????? ??????????????????(??????) ???????? A ?????????????????????? K ????????????????????? ???? ???????????? 2 ????? ??????? LED ???????????
** ?????????????????????????????????????????? ??? ??????????????????????????????????? ????????????????????????????????????????????

???????????????????????? ????????? 7 ????????????????????????????????????


เขียนเมื่อ 2 ??.?. 2554