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LED Flasher (NE555)

2014-12-04 23:15  
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This article describes the LED Flasher (NE555). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:NE555.

This LED flasher give similar circuit with the previous transistor LED flasher, but this circuit use a 555? integrated circuit chip as the active component. Here is the schematic diagram of the LED flasher circuit:

led flasher 555 circuit schematic

This circuit gives alternating LED flashing, but with different flashing period between LED 1 and LED 2. The ON period of the LED 1 is proportional to the R2 value, and the ON period of the LED 2 is proportional to R1 R2 value. If you use a 1M variable resitor in series with a 22k resitor to replace R1, then you get a variable period flasher. The power consumption will be much lower if you use only LED 1 (remove the LED 2 and R4), and choose R2 value to be much lower than R1. This would give you a strobe effect since the ON period will be much shorter than the OFF period.

 


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