wmmullaney New Member Nov 7, 2007 #1 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.
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.
H HarveyH42 Banned Nov 7, 2007 #2 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.
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 Well-Known Member Nov 7, 2007 #3 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
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
Voltboy New Member Nov 7, 2007 #4 Check on RadioShack, they have blinking LED's, whites, red and green. I once bought some, they work fine.
Check on RadioShack, they have blinking LED's, whites, red and green. I once bought some, they work fine.
D Diver300 Well-Known Member Most Helpful Member Nov 7, 2007 #5 74HC132 schmitt trigger + 1 resistor & 1 capacitor. Maybe 1 more resistor to limit the LED current.
Torben Well-Known Member Nov 7, 2007 #6 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
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 New Member Nov 7, 2007 #7 OK, thanks. I DON't want a micocontroller. How do i generate a 2 htz signal?
Torben Well-Known Member Nov 9, 2007 #8 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
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
blueroomelectronics Well-Known Member Nov 9, 2007 #9 Here you go, 2Hz with a CD4060 and a 32768Hz watch crystal http://www.kpsec.freeuk.com/components/cmos.htm#4060 **broken link removed**
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 New Member Nov 10, 2007 #10 Thanks, but I just found a 4 part flasher. (see Will This Schematic Work?)
CynicalMan New Member Nov 14, 2007 #11 For future reference, see http://www.cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html 1 Transistor, 1 Capacitor, 2 Resistors
For future reference, see http://www.cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html 1 Transistor, 1 Capacitor, 2 Resistors
Torben Well-Known Member Nov 15, 2007 #12 CynicalMan said: For future reference, see http://www.cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html 1 Transistor, 1 Capacitor, 2 Resistors Click to expand... Covered in the OP's other thread: https://www.electro-tech-online.com/threads/will-this-schematic-work.33653/ Torben
CynicalMan said: For future reference, see http://www.cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html 1 Transistor, 1 Capacitor, 2 Resistors Click to expand... Covered in the OP's other thread: https://www.electro-tech-online.com/threads/will-this-schematic-work.33653/ Torben
A amando96 Guest Jan 8, 2009 #14 i know how to make one with 1 transistor... PM me for more info(i'm going to upload the pic now xD)
Hero999 Banned Jan 8, 2009 #15 wmmullaney said: Thanks, but I just found a 4 part flasher. (see Will This Schematic Work?) Click to expand... What's wrong with an LED with a built in flash circuit? Only two parts: the LED and resistor.
wmmullaney said: Thanks, but I just found a 4 part flasher. (see Will This Schematic Work?) Click to expand... What's wrong with an LED with a built in flash circuit? Only two parts: the LED and resistor.