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Quick 1.5V flashing circuit diagram

2017-02-02 17:35  
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Quick 1.5V flashing circuit diagram
There is an increased 1.5kΩ resistor connected between pin 4 and pin 8 of National's LM3909 IC, and it makes the flashing rate be 2 times quicker than the 300μF capacitor between pin 1 an dpin 2. Changing the connection of external leads can make the resistance of the internal RC circuit select in 3K, 6K or 9K.