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Adjustable speed LED flasher circuit diagram

2017-02-05 17:23  
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Adjustable speed LED flasher circuit diagram
National's LM3909 flashing IC flash can light the light-emitting diode in different rates, and the flashing LED is used as indicator in the battery-powered portable devices. Flashing speed depends on the chip pin connection. If it increases an external resistor, the flashing rate can be further improved. If the connection of pin 1 and pin 8 is appropriately, you can make the chip internal controlling resistor take 3K, 6K, or 9K. The flashing device can work normally with the power supply voltage higher than 2V, but the lead time is very short, which ensures long battery life.