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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

17 Replies

user
icengBest Answer (author)2015-04-30

This will use less power then 6 parallel !

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user
shahryar.adil.3 (author)iceng2015-05-06

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.

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user
iceng (author)shahryar.adil.32015-05-07

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.

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

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

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user
iceng (author)2015-05-03

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

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user
shahryar.adil.3 (author)iceng2015-05-04

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

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user
iceng (author)shahryar.adil.32015-05-04

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..

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user
shahryar.adil.3 (author)iceng2015-05-05

The values of fixed resistor for a normal blink rate?

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iceng (author)shahryar.adil.32015-05-05

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 ??

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user

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

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user
Downunder35m (author)2015-05-01

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.

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Downunder35m (author)2015-04-30

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

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iceng (author)Downunder35m2015-04-30

OK .... You should draw it up, as I have not seen it in any of your ibles.

But first, I noticed you have ammonia experience, maybe you could help answer my question. https://www.instructables.com/answers/Can-someone-h...

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FarmerKJS (author)2015-04-30
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rickharris (author)2015-04-30

Need more information:

Forward voltage

Current

Blink rate.

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

http://led.linear1.org/led.wiz

https://www.google.co.uk/search?q=555+astable+circ...

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.

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