18th 2006f April, 2006

How to build a versatile and compact 9v LED lamp

by @ 12:47. Filed under LED and IR, Projects
9v LED lamp
P.O. got so excited by all the responses from the TicTac flashlight project that he sent us another of his creations.
This time it’s a LED lamp created from the scraps of an old 9v battery and three LED’s. No need to use a resistor here as he’s used three 3.5v LED’s which adds up to a required voltage of 10.5v… which the battery can’t supply.
The benefit of this is that you don’t have any losses in a resistor and the battery will end up lasting longer – but the LED’s will not operate on 100%.

Take it or leave it, this is a great project that involves few components and has a compact and robust design.

Link: Versatile compact 9v LED lamp

3 Responses to “How to build a versatile and compact 9v LED lamp”

  1. joseph Says:

    cost me £2 to make=0

  2. manuka Says:

    These 9V batteries are poor performers & costly. IMHO humble AAs, although larger,are far superior & DIRT CHEAP. You can hack a cheap 3 x AA switched battery box & fit a white LED for ~ US$2 all up (including batteries). It’ll still be giving out light nearly 1000 hours later too!

  3. P.O. (the inventor) Says:

    Shure, you can make it every way you want – My intention is to let people think (and you did – THANK YOU). But I have had my 9V battery lamp in 2 years now (as a emergency lamp – not light every day) and the battery is still fresh – I think this is compact, simple solution of a handy lamp.

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