Comments on: Use an old Nokia charger to power 1W LED https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/ All about electronics and circuit design Wed, 29 Apr 2026 21:35:38 +0000 hourly 1 http://wordpress.org/?v=3.9.14 By: Best drones with camera https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/comment-page-1/#comment-1574538 Fri, 15 Dec 2017 16:27:20 +0000 http://www.epanorama.net/blog/?p=43#comment-1574538 Thank you very much for your nice article. It is very helpful for everybody.

]]> By: LED Kerze https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/comment-page-1/#comment-1538292 Fri, 24 Feb 2017 12:01:01 +0000 http://www.epanorama.net/blog/?p=43#comment-1538292 Hi admin
I read your blog, its really awesome, I love it.
I have additionally this related website.
An LED flameless candle looks like a real candle but does not burn. Instead, it becomes luminous due to a fitted bulb shaped like a flame, while the exterior is similar to a candle.
LED Kerze
Best Regards
Marlene Lorie

]]> By: Nokia 8210 https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/comment-page-1/#comment-1475624 Thu, 25 Feb 2016 19:32:13 +0000 http://www.epanorama.net/blog/?p=43#comment-1475624 That’s a great little idea. I’m going to try something similar. I can’t see any pictures on this post that show your invention? It would be nice to see what you made.. I’ve just followed you on Twitter so I can catch any new posts here. I’m number 34. Cheers.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/comment-page-1/#comment-663726 Wed, 09 Jul 2014 07:08:33 +0000 http://www.epanorama.net/blog/?p=43#comment-663726 You can find this blog in twitter at
https://twitter.com/epanoramanet

]]> By: top https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/comment-page-1/#comment-662955 Wed, 09 Jul 2014 02:32:44 +0000 http://www.epanorama.net/blog/?p=43#comment-662955 Hi there! Do you use Twitter? I’d like to follow you if that would be okay.
I’m definitely enjoying your blog and look forward to new posts.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/comment-page-1/#comment-355797 Sun, 27 Apr 2014 05:31:16 +0000 http://www.epanorama.net/blog/?p=43#comment-355797 Another somewhat related project:

How to convert charger into night led lamp
http://www.youtube.com/watch?v=o-qscjkYP5M

]]> By: tomi https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/comment-page-1/#comment-603 Sat, 07 Sep 2013 10:14:07 +0000 http://www.epanorama.net/blog/?p=43#comment-603 The idea is to do with the current limiting and voltage drop on the system.
When the power source output current limited to some sensible current range at needed charge voltage, the charge circuitry inside the mobile phone becomes simpler to design.

That 3.7V is typical battery voltage that is in lithium battery packs used in cell phones.
And that around 300 mA current is pretty suitable charge current level…
You needed to ass some electronics to start and top charging depending on battery voltage levels etc..

]]> By: waste https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/comment-page-1/#comment-602 Fri, 06 Sep 2013 11:18:19 +0000 http://www.epanorama.net/blog/?p=43#comment-602 Thanks for the tutorial, I came across a couple of old nokia chargers and opened them to toy around.

Actually the charger is quite simple. A transformer The only added electronic apart from the transformer and 4 1n4001 is a 1.4Ohm resistance between the transformer and the bridge rectifier.

So I was wandering why did they put a resistance there. Has this to do anything with high drop from 8V (rectified) to 3,7 when loaded?

thanks for the inspiration

]]> By: Parker Kology https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/comment-page-1/#comment-595 Thu, 19 Jul 2012 05:13:53 +0000 http://www.epanorama.net/blog/?p=43#comment-595 I am glad to be a visitor of this thoroughgoing web blog ! , thanks for this rare information! .

]]> By: Russell Leffelman https://www.epanorama.net/blog/2009/04/17/use-an-old-nokia-charger-to-power-1w-led/comment-page-1/#comment-544 Fri, 30 Jul 2010 19:04:17 +0000 http://www.epanorama.net/blog/?p=43#comment-544 Thank you very much for this great blog post; this is the kind of post that keeps me going through the day. I’ve been searching around for your site after I heard about them from a friend and was thrilled when I was able to find it after searching for some time. Being an avid blogger, I’m pleased to see others taking initiative and contributing to the community. I just wanted to comment to show my appreciation for your work as it’s very encouraging, and many writers do not get the credit they deserve. I’m sure I’ll be back and will send some of my friends.

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