LM3909 - National Semiconductor

LM3909 LM3909 LED Flasher/Oscillator

The LM3909 is a monolithic oscillator specifically designed to flash Light Emitting Diodes By using the timing capacitor for voltage boost it delivers pulses of 2 or more volts to the LED while operating on a supply of 1 5V or less The circuit is inherently self-starting and requires addition of only a battery and capacitor to function as an LED flasher Pack.

Features

Y Y Y Y Y Y Y Y Operation over one year from one C size flashlight cell Bright high current LED pulse Minimum external parts Low cost Low voltage operation from just over 1V to 5V Low current drain averages under 0 5 mA during battery life Powerful as an oscillator directly drives an 8X speaker Wide temperature range Applications Y Y Y Y Y Y Y Finding flashlights in the dark or locating boat mooring floats Sales and advertising gimmicks Emergency locators for instance on fire extinguishers Toys and novelties Electronic applications such as trigger and sawtooth generators Siren for toy fi.