Lm3909 Led Flasher Oscillator Circuit Diagram Electronic Design - this is a very easy and simple led flasher with only three ponents a flasher ic lm3909 a led indicator and an electrolytic capacitor the supply voltage is 1 5v so it can be operated using a 1 5v battery which can be easily found on market this is a very easy and simple led flasher with only three ponents a flasher ic lm3909 a led indicator and an electrolytic capacitor below is the circuit diagram of an lm3909 led flasher taken from an out of print electronics magazine i built this circuit on a tiny pcb many years ago the circuit operated from a single 1 5v cell but could also operate from a single 1 2v rechargeable cell lm3909 led flasher oscillator the is a monolithic oscillator specifically designed to flash light emitting diodes by using the timing capacitor for voltage boost it delivers pulses 2 or more volts to the led while operating on a supply 5v or less the circuit is inherently.

this page features a replacement circuit for the lm3909 led flasher oscillator using discrete ponents the circuit is functionally the same as the integrated lm3909 but has a minor variations in values of the ponents used lm3909 frequency generator led flasher circuit ideas the oscillator or the frequency generator by most popular use ne555 or transistors or various gate the output frequency setting depend on the resistance or capacitance as well as use the crystal control or frequency to the circuit 1 5v led flasher oscillator mimics the now discontinued lm3909 ic can be adapted to a wide variety of applications design description the 8 lead plastic mini dip lm3909 ic was developed by national semiconductor in the mid seventies of the past century it was a monolithic oscillator specifically designed to flash light emitting diodes by using the timing capacitor for voltage boost.

it span class news dt 10 05 2007 span nbsp 0183 32 the easiest replacement for the lm3909 is a standard flashing led although you cannot set the flash rate the great thing about electronics is unlimited ways to do the job the only limit is one s imagination



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