Cheapest way to make a pulsing LED

[gonadgranny]

Hi there folks. Was just wondering what might be the cheapest way to make an LED pulse. SO far the only way i know to do it anyway is by using an arduino with PMW which is great as there is a lot of control over the phase length etc. So i would go for an attiny85 which is about a quid. Still seems like a bit of an overkill so was wondering if anyone knew of a better way. There is also the factor of ease too. I don't want to have to spend too much time making a circuit as this would end up being more costly in the long run. thanks in advance. Dan.

 

[xenos]

a) There are flashing leds (IC for pulsing inside LED structure) with specific frequence
b) NE555 (user selectable frequency of pulses)
...

 

[KlausST]

Hi,

two bjt, some resistors and some capacitors. Astable multivibrator.

Klaus

 

[Audioguru]

I use two different kind of multi-color LEDs with the flashing and/or fading circuit inside. One of them slowly fades from one color to the next color and the other kind flashes the colors a few times quickly then fades them a few times slowly over and over.