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LED Circuit for AC Powerline Indicator (LM1458)

2014-12-14 19:22  
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This article describes the LED Circuit for AC Powerline Indicator (LM1458). 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:LM1458.

Light Emitting Diode or LED is suitable for ON/OFF indicator since it has high durability, almost free of? maintenance. The most common usage is in low voltage application since the operating voltage is low DC. Taking the benefit of its high durability of LED? in? high AC voltage? from line voltage can be done using this circuit:

ac powered led circuit schematic diagram

The capacitor is used to limit the current, and the zener diode is used to limit the voltage. The zener diode also provide a path to dischage capacitor at the half cycle when the direction is backward to the LED.? Since the current amount is limited by the capacitor,? you can select the capacitor value to adjust the current to suit your need. It gives about 4 mA at 100nF, and about 20 mA at 470 nF. Please note that the lower the current, the longer the LED’s lifetime.


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