The project is dedicated to helping people build a high performance sealed lead acid battery charger. The project is also available as a partial kit with a custom made PCB. However, there is also enough information for you to build your own PCB (or use Vero board) or change the design to suit your own purpose.
Lead Acid Battery Charger: [Link]
The battery equalizing is necessary for the not perfect matching between the elements that composes a battery pack. During the successive battery charging and discharging there is always a cell that has a capacity slightly different from the others and after multiple cycles is deeply discharged; this cell has a big probability to break.
In order to avoid this problem all the cells should be discharged individually with a particular circuit capable to individuate the end-of-discharge moment for each cell.
The Equalizer Discharges The Battery Packs With Individual Action On Each Cell: [Link]
Here is a new version of the classic color organ, where different color lights are triggered by different frequencies of sound, resulting in a display that flashes along to music. In this case the newer type high intensity LEDs (3000 - 5000mcd) were used along with a very simple discrete transistor drive circuit. The design goals included small size and excellent portability, as well as long battery life.
LED Color Organ: [Link]
Since you liked my previous posts about Spy gadgets , im going to continue the series with this new gadget a Spy cam hidden inside a gum wrapper, pretty cool i say. I guess everyone needed at least once a gadget like this , to secretly record someone, to incriminate him about something or to blackmail him/her although you know this is illegally and i do not encourage you to do so. To be completely safe you can just aquire this gadget and play with it, but we all know thats not gonna happen 
.
Chinavasion presents us with this cool gadget that has the following features : a micro SD card slot for up to 2GB of memory, a hold switch for making sure the camera does not accidentally switch off, long audio and video recording range, along with 176×144 resolution digital clips in 3GP format. It also has a Li-Polymer battery so you can recharge it very easy trough the USB cable.
Here are some of the Manufacturer Specification:
Accessories:
Using this technology your next laptop could have a continuous power battery that lasts for 30 years without a single recharge thanks to work being funded by the U.S. Air Force Research Laboratory. The breakthrough betavoltaic power cells are constructed from semiconductors and use radioisotopes as the energy source. As the radioactive material decays it emits beta particles that transform into electric power capable of fueling an electrical device like a laptop for years. Although hearing the expression “betavoltaic batteries” you may think at nuclear energy they are not based on nuclear energy. They neither use fission/fusion or chemical processes to produce energy and so they do not produce any radioactive or hazardous waste.
You can read full article here Link
