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I need a simple low power LED flasher circuit

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alanzhao

New Member
Hi,

I need a simple low power LED flahser circuit to fake car alarm. Ideally, it should consume 1.5v-3v for 12 months. I prefer using 555 timer or few transistors, because it's easier for me to build.

I've found lots of LED flasher circuit on the web, but couldn't find the right one. Any links or comments would be appreciated.
 

nettron1000

New Member
Use a CMOS 555 such as a 7555 or TLC555, very low current.
 

k7elp60

Active Member
LED flasher

Why not use a standard flashing LED with a 1K resistor in series for a 12V auto system.
 

bogdanfirst

New Member
are you sure that you don't mean that your led should draw 1.5-4mA
anyway, for 1.5 volts you could use a LM3909 chip. do a search for 'LM3909 led flasher' and you will find lots of things.
i suggest powering the led from the car battery.
 

Screech

New Member
I bought a very bright 12v flashing led.
as had no space to mount the led or hunt around for wiring , I put it in a little black box with a 9 volt battery.
and connected a 12k Resistor to it.
yes, 12,000 ohms.

Power Consumption: 0.25 - 0.5 Milliamps with a 12k Resistor.


then I putt the box in front of dash ,behind and above the center of the steering wheel.

I installed the battery on 22 october 2003, and it's still goint strong with the same battery.
 

electroyas

New Member
why use ic for such a simple task. As i can remember there was a circuit only with one transistor and small amount of coils which could blink led at about 1Hz or any by 1.5V battery for very long time. Just search for joule thief circuit and change capacitor values large. I did this long time a ago. Quite easy and compact.....
 

dr pepper

Well-Known Member
Most Helpful Member
I tried a flashing joule thief circuit, one with a ldr to turn it off during the day, I scrapped it in favour of a pic micro circuit, if you want I'll see if I can find the schematic.
 

dr pepper

Well-Known Member
Most Helpful Member
Maybe its a 10 year anniversary.
 
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