USB/SD card remote controlled mp3 player

Low powered USB / Micro SD card mp3 player in different shapes is getting popular in sound systems.
It plays mp3 directly from the memory card or pen drive along with the fully functioned remote control.

It comes with the voltage regulator L7805 which takes DC voltage input from any DC source and gives 5volts at the output to run this mp3 player. You can see its circuit here
It is a two channel (stereo) player having Left and Right channels and gives good sound quality , works also as a small preamplifier.

Amplifier fitted with mp3 player

USB powered mini refrigerator

Here is the new innovation specially for the laptop users " The USB powered mini fridge"
It is great and extremely power efficient. It is operated at only 5 volts and can be used any where. It is becoming popular very fast among the laptop and i-pad users.
Instead of going to your home fridge and take the can of your favorite drink you just plug your mini fridge with your device and wait for 5 minutes so that your drink gets cool enough.
It consists of a magnetic door to prevent the outer air from entering in it and lighted with the LED inside.

It costs only 24$