This fun hack is an electric fly swatter modified to power a compact fluorescent light (CFL). It runs on 2 AA batteries for around 3 hours and 45 minutes.
When I'd previously opened up an electric fly swatter as a possible power source for something else, I was surprised to find a joule thief/blocking oscillator circuit inside. I'd previously used one of those circuits from scratch to power a CFL so after some prompting from comments on my electric fly swatter video, I gave it a try with the fly swatter.
Below is the schematic for the original electric fly swatter circuit and below that is the modified one for powering a CFL. The few modifications are circled in red. All the parts on the output side of the coil (the left) were removed and replaced with just the CFL. Also, one resistor was changed from 1200 ohms to 820 ohms to get a brighter light while still protecting the transistor. And the original switch was a momentary switch, meaning the circuit was on only while you held the switch closed. I replaced that with a switch that you could turn on and let go while it stayed on.
See my webpage all about reading schematics if you're unfamiliar with reading them.
Below you can see that wires are soldered to the CFL's tube. Those wires are then connected using marrettes to the wires from the fly swatter and then tucked into the white container and the CFL is put in place, hiding them.
To see the details of how to get the CFL fluorescent tube from the CFL watch the video below or see the steps on my page about making a joule thief circuit from scratch for powering a CFL tube.
Video - How to Make CFL Powered by Electric Fly Swatter/Racket Zapper
Below is a video showing how to make the CFL powered by a fly swatter, along with some demonstrations and a test to see how long it runs for.