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# Can anyone design me a circuit? Answered

Hey Guys, I'm back asking questions (yay). I was wondering if anyone could design me a circuit for 6 Blue Leds in parrelel running from a 9v battery with a 555 ic to blink them.

-Prickly Potato

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## Discussions

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This will use less power then 6 parallel !

Sorry I accidentally deleted all the comments. I was saying that "Yes please make the decision for me", oh and another thing the six LED's will be arranged in the shape of a smiley face.

It is best to change C1 (o..47 to 100 uF ) if you want to alter the timing currently set to about 1.1 sec.

If you are more adventuresome the Bowden calculator lets you change resistors and see the timing.

http://www.bowdenshobbycircuits.info/555.htm

The o.01 uF is for stability and does not affect the blink rate.

Where the LEDs, capacitors and the 555 IC all meet :)

Can you give me the values of the potentiometers i would need to control the blinking of LED's?

How long is a Blink ?

How often do you want it to Blink ?

I have tried to read your mind but it is closed to me..

The values of fixed resistor for a normal blink rate?

You must tell me what you want this normal blink rate to be then I can calculate the resistors to make that 4 U.

Some people make the blink 3.33 ms and the duration 4 hours other people blink for one second repeating every thirteen seconds as a normal blink rate....

Are you unable to make such a decision and want me to do that for you ??

BTW the six leds will be arranged in the shape of a smiley face

This circuit by Michael Ringe uses a simply flip flop to charge two capacitors to the level required to flash a white or blue LED.
It can flash for several weeks on a single battery.
You can check if two of your LED's still flash sufficient when in parallel but it would be best to have once circuit per LED.

Did you consider a cheap heap or bicycle lamp?
They come with 3 or more white LED's and run on 3-4.5V, should be no problem to add a few more LED's to them and the battery pack uses little more space than a 9V block battery.

Two transistors, some resistors and capacitors, no need for a 555 to blink some LED's ;)

Forward voltage

Current