true bypass with "blinking" LED possible?

[MarkDonMel]

Hey all,

I was going to order some LED to use as on indicators on a couple pedals I want to build.  Is there a way to have them blink when the pedal is on instead of just being all the way on constantly?  And, maybe be able to have a variable blinking rate via a pot or something? Say from a slow blink to a faster strobe-like blinking?

Thanks, Matt.

[MarkB]

Courtesy of Joe D..


Though, I think you can get blinking LEDs anyway..
"-)

[MarkDonMel]

Thanks MarkB.  

As a beginner I am going to have to have a second look at that circuit but it looks doable for me.

Thanks again, Matt.

[ExpAnonColin]

You also could use many waveforms, IE a 555's astable multivibrator, to power the LED.  YOu just replace the 9v on the switch with the waveform, given that the voltage and current are all right.

-Colin

[casey]

cant you buy l.e.d.'s that blink by themselves?  i think i have
even seen this at radio shack....

[Gilles C]

Hum... what is the link for the changing color LED?

I just had a rush to build one...

[casey]

here it is....

http://www.radioshack.com/category.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F011%5F006%5F002%5F000&Page=1&find=led(keyword)

its the bottom 2

you can get it in blue i think as well.

[gez]

You can do a 'flashing millennium' using CMOS inverters.  Layout is everything with those type of oscillators (simple square wave type) though as it's easy to accidentally introduce ticking.

[Gilles C]

That's what I had in mind, 3 colors with 1 LED

http://www.theledlight.com/img-LED/Blinking-ani.gif

[Paul Marossy]

I do believe that RS sells flashing LEDs, no external circuitry required.