怎樣做到LED閃爍

你到鴨寮街買兩粒自閃的LED，一個在左，一個在右。那一個接電就會自閃。
簡單非常。
不過，每邊唔可以多過一粒，因為會不同步閃。閃幾快係冇得控制。
若果想控制，可以用世界通行的555。八隻腳。好易買。加幾粒電阻就得。要閃幾快可以自己計。再唔係用vr隨意擰。
輸出腳可推200mA，夠晒用。唔夠再加晶體管推。
跟據spec供電係4.5v至15v左右。不過好多人試過再低電壓都work，你有3.7v應該冇問題。
呢個係電路圖。

圖片參考：https://s.yimg.com/lo/api/res/1.2/K0NcBktqCr9qwqC2bRTOnw--/YXBwaWQ9dHdhbnN3ZXJzO3E9ODU-/http://cdn.instructables.com/FQB/IYN8/H8TTO2KJ/FQBIYN8H8TTO2KJ.LARGE.jpg

3腳輸出可以source也可以sink，即係指出指入都得。若想a/b燈對著閃也可以。
實物圖

圖片參考：https://s.yimg.com/lo/api/res/1.2/nyj_.7H7.R55i467p3Q06A--/YXBwaWQ9dHdhbnN3ZXJzO3E9ODU-/http://cdn.instructables.com/FLF/9KJ2/H8CVG9R8/FLF9KJ2H8CVG9R8.MEDIUM.jpg


其實你在搜尋器輸入555 led FLASH你會搵到好多好多好多示範。

Besides of what Lee's has said, you may also have to buy some CAPACITORS to Steady the current output if you are going to drive a HIGH CURRENT.

Also, if you wish to design a LED indication board with MANY LED, you may have to use MOSFET to amplify the output current of Timer 555.

The CONFIGURATION of Timer 555 and its PERIPHERALS(eg. MOSFET, Capacitors) can always be EASILY FOUND on YOUTUBE or GOOGLE.


Here is one of the YOUTUBE LINK about Timer 555:

https://www.youtube.com/watch?v=aJAZHPqEUKU

And of course, there are many RESOURCES or Internet about this topic.

唔使搞，買自閃LED，可閃三色。