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wmmullaney · 7th November 2007, 11:34 PM

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 · 7th November 2007, 11:38 PM

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 · 7th November 2007, 11:39 PM

Quote:

Originally Posted by 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.

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 · 7th November 2007, 11:53 PM

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

Diver300 · 8th November 2007, 12:10 AM

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

Torben · 8th November 2007, 12:39 AM

Quote:

Originally Posted by 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.

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

Torben

wmmullaney · 8th November 2007, 01:33 AM

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

Torben · 10th November 2007, 03:54 AM

Quote:

Originally Posted by wmmullaney

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 · 10th November 2007, 04:48 AM

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

wmmullaney · 10th November 2007, 12:28 PM

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

CynicalMan · 14th November 2007, 11:27 PM

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

Torben · 15th November 2007, 11:04 AM

Quote:

Originally Posted by CynicalMan

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

Covered in the OP's other thread: http://www.electro-tech-online.com/g...atic-work.html

Torben

wmmullaney · 15th November 2007, 11:50 AM

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

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7th November 2007, 11:34 PM	(permalink)
wmmullaney	LED Blinker 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.

7th November 2007, 11:38 PM	(permalink)
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.

7th November 2007, 11:53 PM	(permalink)
Voltboy	Check on RadioShack, they have blinking LED's, whites, red and green. I once bought some, they work fine. __________________ The best e-book AAC

8th November 2007, 12:10 AM	(permalink)
Diver300	74HC132 schmitt trigger + 1 resistor & 1 capacitor. Maybe 1 more resistor to limit the LED current.

8th November 2007, 01:33 AM	(permalink)
wmmullaney	OK, thanks. I DON't want a micocontroller. How do i generate a 2 htz signal?

10th November 2007, 04:48 AM	(permalink)
blueroomelectronics	Here you go, 2Hz with a CD4060 and a 32768Hz watch crystal http://www.kpsec.freeuk.com/components/cmos.htm#4060 __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

10th November 2007, 12:28 PM	(permalink)
wmmullaney	Thanks, but I just found a 4 part flasher. (see Will This Schematic Work?)

14th November 2007, 11:27 PM	(permalink)
CynicalMan	For future reference, see http://www.cappels.org/dproj/simples...r_Circuit.html 1 Transistor, 1 Capacitor, 2 Resistors

15th November 2007, 11:50 AM	(permalink)
wmmullaney	Ya, found it. Thanks all for all the help!