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More  Flashers/Blinkers LED Circuits

AC LINE POWERED LED FLASHER NUMBER 3  --  August 9, 2011

Some of the latest LEDs are amazing.  They can produce a surprising amount of light with very little current.  In the light flasher application shown below I take advantage of a nice surface mounted LED from King Bright.  This flasher circuit draws only about 3ua of average current from the AC power line to flash this green LED.  This flasher might be used as a power indicator light.

The circuit taps a bit of power from the AC line using two 470pF capacitors.  A bridge rectifier, filter capacitor and a zener diode form a 8v DC supply.  That DC voltage feeds a pulse generator set for a 20ms pulse, running at a frequency of about 0.5Hz. It uses a very low power LMC7215 voltage comparator from National Semiconductor.  R3 sets the pulse rate.  R6 sets the peak LED current at about 200ua.

Click on Drawing Below to view PDF version of Schematic

AC Line Powered LED Flasher 3 circuit designed by David Johnson



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