Comments on: High power LED blinking circuit

By: sleepy

sleepy — Sat, 21 Jun 2008 23:43:51 +0000

wow hack-a-day has really gone downhill

By: James

James — Thu, 19 Jun 2008 17:42:09 +0000

I think the hackaday text should say 4 AAA batteries, not 3. Although the LED may work fine at 4.5V also.
The light bulb will act as a current limit resistor. If the value is appropriate then he should have no issue of burning the LED out.

By: killerpiggypie@gmail.com

killerpiggypie@gmail.com — Thu, 19 Jun 2008 02:54:51 +0000

Your going to burn out your led unless you get the driver for it…

By: Fool2cool

Fool2cool — Wed, 18 Jun 2008 23:35:22 +0000

I think this exact same thing is found in the indicator circuit in a cars indicators, i think its located on hte fuse box, it heats up and cools down on the exact same principal as the christmas light except no extra light. I have no idea how youd interface with the one out of a car though, i imagine it would require 12v to operate it.

By: andrew

andrew — Wed, 18 Jun 2008 23:19:49 +0000

Tiny hack of dubious utility, but ok… Why use a 5W LED though? I used to duty-cycle regular old LEDs and they’d take several Amperes at low duty cycles. Imagine what a heat-sinked 5W (back-of-napkin guess: 4×1.5 = 6V, 5/6 = 830mA) LED could do when I was putting 2A through a 20mA LED with no heat sink!

By: sackofcatfood

sackofcatfood — Wed, 18 Jun 2008 23:15:26 +0000

The light is clever, and saves you the need for a resister, but unfortunately your “immortal” diode circuit is now mortal. :p
(And of course the auxiliary light might be annoying… if it suited your purpose, you wouldn’t need the LED!)

Surely someone makes a reusable fuse that operates on the same principle as the light?