Deadbugged LED Strobe

89201403972533359 [Steel 9] was looking around for a LED strobe light for reasons unknown. He couldn’t find any that he liked, and when that happened, he did what any normal person would do – make one himself.

[Steel] based this build around a Harbor Freight 27 LED flashlight. This flashlight is just that – a simple switch to turn the LEDs on and off, a button, and from the looks of things, not even a single current limiting resistor. A masterstroke of engineering, surely,

The added circuitry consists only of a pair of transistors, a few resistors, a capacitor, and a pot. Yes, [Steel] is too cool for a 555 chip, It’s just a simple multivibrator circuit and none of the component values are very sensitive.

[Steel] got exactly what he wanted without even having to break out a breadboard. Since he just deadbugged all the circuitry, he’s also reusing the plastic enclosure of the flashlight. That’s a win in any book.

Hack a Mag-Lite to be Rechargeable


Most tools sport rechargeable batteries these days, but there’s no need to toss that old flashlight: just replace the cells with rechargable ones!

[monjnoux] had a 3-cell D-sized MagLite lying around—though you could reproduce this hack with a 2 to 5 cell model—which he emptied of its regular batteries and replaced with some 11000mAh NiMHs from eBay. The original bulb was also tossed in favor of a 140-lumens LED.

After disassembling the flashlight, [monjnoux] set about installing the new parts. He replaced the original bulb with the LED, soldering it into place and securing it with hot glue. He then drilled a hole in the body of the flashlight for a DC socket. The charger he purchased is adaptive, detecting the number of cells and adjusting its voltage accordingly. It had the wrong connector, though, so [monjnoux] simply chopped off the end and soldered on a new one. For a hack that comes in at 40€, it’s definitely a cheaper alternative to the official rechargeable model: which costs 80€. And with a duration of 7 hours (though it’s unclear whether this number reflects continuous use), it likely outlasts the official model, as well.

Scratch-built Smart Flashlight


This flashlight has a face; one of the many tricks which [Hobbyman] included during the development process. The smart flashlight build turned out to be a great way to practice so many different aspects of product development.

It was envisioned as a light for use when walking or biking that could do more than just light your way or flash on and off. Of course we know it’s really just a reason to spend way too much time in his lair. He started with the electronics, driven by a PIC 16F88. The 5×5 LED matrix gives him just enough to work with for patterns and rudimentary text. The prototype is wrapped up into a pretty tight package which leaves enough room in the 3D printed case for 4 AAA batteries. As the project progressed more and more features were added in. The most current offering includes a temperature sensor as well as the ability to react to ambient sound. See for yourself after the break.

Continue reading “Scratch-built Smart Flashlight”

Hack a Solar Garden Light Into a Flashlight


While browsing through his local dollar store, [Taylor] came across a suspicious looking rock that, upon closer inspection, turned out to be a solar garden light. He scooped it up, took it home and cracked it open, modding it to function as a handheld solar flashlight.

Inside was a pathetically small 40mAh rechargeable battery, which he upgraded to a more standard rechargeable AA. The garden rock came pre-built with its own boost converter to kick up the voltage for the LED, but it was fairly dim. We’re guessing [Taylor] didn’t bother reverse engineering the converter and instead simply did some trial and error, but he managed to increase the LED’s brightness by slapping on a different value inductor.

As fun as it may be to have a rock for a flashlight, [Taylor] decided to cobble together a custom case out of a spare USB charger, making a battery holder and adding a pushbutton. The result is a handy solar flashlight that takes around five hours to charge. Check out some other custom lights: a lithium-powered PVC flashlight or one with a snazzier aluminum body and interchangeable heads.

Giving a crank flashlight a super capacitor overhaul


[Caleb] was given a tiny LED flashlight which has a crank used to charge it. Unfortunately it wasn’t holding a charge, and constant cranking didn’t work very well either. He cracked it open to find a single lithium button cell. Instead of using a drop-in replacement he soldered in his own super capacitor.

The stock device is remarkably simple. It uses a standard DC motor as the generator. It’s connected to the crank using a set of gears, with the two red wires seen above connecting it to the control board. Four diodes make up a bridge rectified and apparently feed directly into the battery. No wonder that cell went kaput!

But this orientation isn’t bad for using capacitors. They can be charged directly and the switch which attaches the LEDs to voltage doesn’t interfere with their operation. The last problem was making room for them in the case. [Caleb] considered a few different approaches, but ended up just heating the plastic enclosure until it could be deformed to make room for the additional parts.

DIY Lighting Solutions


With daylight savings time starting up, you might not have quite as much need for lighting, but this pair of hacks should keep everything well lit whether outside or indoors.  Check out the videos of both in action after the break.

The first lighting solution comes to us from [Ben]’s Youtube channel. It’s a simple solution, press-fitting a clamp light into a 1 inch PVC Tee to attach the light to a pipe. The base is made with PVC shaped into three feet for a (hopefully) sturdy rest.  Several lights can be used as needed, and would probably work well for making his next video.

The second light also comes to us from Youtube, and is about converting a stock LED light into one that is much brighter. Skip to around 7:00 to see the outdoor comparison.  You may or may not want to do this exact hack, but you never know when you might want to swap out your blinkenlights for something that will scare the neighbors!
Continue reading “DIY Lighting Solutions”

Recycle lithium cells by building custom flashlights

This isn’t a brightest flashlight in the world type of hack (but it does manage to push about 1000 lumens). [Stephen Webb] is finding a use for leftover parts by building his own simple LED flashlights. As you can see, he uses PVC parts available at any hardware or home store. These are a good choice; they’re cheap, light weight, resilient, designed to be water tight, they easily thread together and have connectors that reduce the diameter of the fittings.

The electronics use standard size cylindrical Lithium cells. These are found in many types of Laptop and Power Tool batteries. Often when one of those battery packs bites the dust it’s an issue of one or more bad cells. [Stephen] desolders the cells, and reuses the good ones in this project.

We didn’t see any mention of a recharging technique. Does anyone have any advice on how to top these cells off if they’re not in their original power pack form?