# looking for Small 3 way LED flasher circuit design

#### george0039

Joined Oct 15, 2008
167
Hello
I need the memberships help.
I would like to have a Small circuit, not a PIC, because I dont know programming and this is a couple circuits only needed.
My voltage is 6v to 12v. The LED is a three color flasher, three leeds in the LED. I would like the circuit to be triggered by me so that it flashes ALL three led colors in a rate that each color can be seen and ONLY be stopped by powering the circuit off. I have experience with the old 555 I.C. I know, ancient, but I can solder directly to its pins with components and it is physically small.

Any help would be appreciated.
Thanks
George

#### Dodgydave

Joined Jun 22, 2012
9,920

Does each led have its own flasher circuit, if so three 555 timers.? Or leds chasing in a row with a cd4017?

Do you want variable speed.?
Is it separate leds or one tri colour led.?
What power led are they.?

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#### george0039

Joined Oct 15, 2008
167
Hello Dodgydave

No variable speed, would like the LED to flash between ALL three of its colors with enough time to see each color.
The LED is one Tri color LED with 3 pins coming from it.
Sorry I dont know the exact power of the LED. Has not been bought yet, is there a range you can work from?

I hope you are able to come up with a working circuit for me with this info.

George

#### Bernard

Joined Aug 7, 2008
5,775
Most likely a R-G LED, third color, Y, is combination of R & G.. If it were a flasher, probably would have 2 leads.
How about a 4022 or 4017 & a 555; can use diodes & resistors to direct stages to correct LED pin..
Is LED common A or K ?

#### george0039

Joined Oct 15, 2008
167
Anyone have a circuit that would do what I need?

George

#### MrCarlos

Joined Jan 2, 2010
400
Hello george0039

How does your small device (LED) is connected?
You say it has 3 colors and 3 terminals.

Can I see a picture of your 3 colors LED ?.
Compared to something known as a match or a coin.

If the configuration of the PINs of Your three-color LED is as I suppose, you could use the attached circuit in the PDF document.
Note that lacks the current limiting resistors for each of the three LED.
As I do not know the electrical characteristics of your device I can’t calculate the value of these resistors.

I can not ensure that the IC 4017 can turn ON the LED's because I do not know the
As you can see, lack information to develop a circuit that really serve you.

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#### Bernard

Joined Aug 7, 2008
5,775
Circuit in post #6 is clever. I have not seen a LED like that, OP has not listed the colors but I have a R-G 5 mm LED that if R & G are on they give a poor amber.

#### Colin55

Joined Aug 27, 2015
519
Your requirement is VERY complex. You can buy a flashing RGB LED for 20 cents on eBay.

#### george0039

Joined Oct 15, 2008
167

#### Bernard

Joined Aug 7, 2008
5,775
Do you have a sample LED in hand? eBay picture shows two leads. Is it something like Electronic Goldmine # G13897, Rainbow Flashing LED ? If so flashing is fixed, current 16mA to 20 mA @ about 3 V. No control of individual colors.

#### george0039

Joined Oct 15, 2008
167
Do you have a sample LED in hand? eBay picture shows two leads. Is it something like Electronic Goldmine # G13897, Rainbow Flashing LED ? If so flashing is fixed, current 16mA to 20 mA @ about 3 V. No control of individual colors.
Hi Bernard

No I dont have one in hand and I dont know about the Electronic Goldmine version BUT Yes it is two leads. The specs I posted is all I know about it. It says it is a fast flasher. So what circuit can control it? I do have it ordered and it`s on the way from China to Canada.

George

#### Bernard

Joined Aug 7, 2008
5,775
You can turn it on or off & control brightness with current limiting resistor of 150 ohms up to about 1K @ 6 V.