LED Blinker

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wmmullaney

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Hello, I want to build a 1 led flasher NOT using a 555 or 556. I need it to flash about every half second or so. I want the least components possable.
 
They make LEDs with the flash circuit built in, and its usually about 2 Hz... half a second per flash, can't get less parts then that.
 
wmmullaney said:
Hello, I want to build a 1 led flasher NOT using a 555 or 556. I need it to flash about every half second or so. I want the least components possable.
Click to expand...

I'm presuming you also don't want to use a small microcontroller.

Google for "2 transistor flasher". You should find lots of examples.


Torben
 
Check on RadioShack, they have blinking LED's, whites, red and green.
I once bought some, they work fine.
 
74HC132 schmitt trigger + 1 resistor & 1 capacitor. Maybe 1 more resistor to limit the LED current.
 
HarveyH42 said:
They make LEDs with the flash circuit built in, and its usually about 2 Hz... half a second per flash, can't get less parts then that.
Click to expand...

Hehe. Yep, that would win the part count race for sure.


Torben
 
wmmullaney said:
OK, thanks. I DON't want a micocontroller. How do i generate a 2 htz signal?
Click to expand...

Do you need this thing to flash briefly every half second, or do you need it to go on for half a second, off for half a second, etc?


Torben
 
i know how to make one with 1 transistor... PM me for more info(i'm going to upload the pic now xD)
 
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