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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.

Thanks in advance.
-Prickly Potato



Best Answer 3 years ago

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.

Here are your circuit values.

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.


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


3 years ago

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


3 years ago



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.

1.5V white blinker.jpg

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

Google is your friend!

Need more information:

Forward voltage


Blink rate.

You 9 volt battery is very current limited and won't run them for long, perhaps not at all.



The 555 astable (no stable state so it just keeps flip flopping back from on to off - in fact in my day was called a flip flop) is very common circuit above. You need to work out the R and C values for the blink rate you want.