LED Blinker

[wmmullaney]

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.

 

[HarveyH42]

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.

 

[Torben]

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.

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

 

[Voltboy]

Check on RadioShack, they have blinking LED's, whites, red and green.
I once bought some, they work fine.

 

[Diver300]

74HC132 schmitt trigger + 1 resistor & 1 capacitor. Maybe 1 more resistor to limit the LED current.

 

[Torben]

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.

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


Torben

 

[wmmullaney]

OK, thanks. I DON't want a micocontroller. How do i generate a 2 htz signal?

 

[Torben]

OK, thanks. I DON't want a micocontroller. How do i generate a 2 htz signal?

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

 

[blueroomelectronics]

Here you go, 2Hz with a CD4060 and a 32768Hz watch crystal
http://www.kpsec.freeuk.com/components/cmos.htm#4060
**broken link removed**

 

[wmmullaney]

Thanks, but I just found a 4 part flasher. (see Will This Schematic Work?)

 

[CynicalMan]

For future reference, see
http://www.cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html
1 Transistor, 1 Capacitor, 2 Resistors

 

[Torben]

For future reference, see
http://www.cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html
1 Transistor, 1 Capacitor, 2 Resistors

Covered in the OP's other thread: https://www.electro-tech-online.com/threads/will-this-schematic-work.33653/


Torben

 

[wmmullaney]

Ya, found it. Thanks all for all the help!

 

[amando96]

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

 

[Hero999]

Thanks, but I just found a 4 part flasher. (see Will This Schematic Work?)

What's wrong with an LED with a built in flash circuit?

Only two parts: the LED and resistor.