LED_FLASHER

Published:2009/6/19 2:52:00 Author:May | From:SeekIC

This circuit provides a low-cost way to flash an LED from a single 1.5-V source. Based on the ICL7660 dcto-dc voltage converter, the circuit makes use of an extemal capacitance (C1) on the os-cillator ratecontrol pin to decrease the charge/dump time to the desired flash rate. A dc resistance (R1) on the same pin can also be used to disable the oscillator and extend the power-cell's life. That optional dc resistance (in the form of a photoconductive cell) will shut off the oscillator in daylight.



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