One of my projects (AVR DDS 2.0) requires multiple power supply that could supply +12V, -12V, and 5V. Back then I have constructed a simple transformer based power source with few linear voltage regulators. It works fine but is powered from mains 220V which is not the safest solution to squeeze in to box enclosure. Another option was using ATX PC power supply, but it is too big. Banggood has been offering pretty attractive power supply kit which has a voltage boost circuit which rises voltage level either from USB or from the 5-24V jack. Power supply kit has most of the voltages that you may need including + 12V, -12V, + 5V, -5V, and +3.3V. It is capable to output 300mA per channel. Total power is limited to 10W which is not bad and can provide a short-term high current single output, but be sure to attach included heat sinks to protect ICs from overheating. It is advised to keep output currents of each channel to less than 0.2A.
In the past few decades, many scientists have been predicted that in the future, the hybrid motors are going to be dominated the roads. Well, it seen that the prediction is slowly becoming a reality, as there are more and more hybrid motors exist on the roads in present days. The only problem is the hybrid cars are not mass-produced, since their production costs are relatively high compare with the ordinary vehicles. In this case, a researcher from ETH Zurich has developed a brand new concept. It’s a part of her doctoral thesis that integrates power electronic functions and an electric motor. Hanna Plesko, a doctoral student at Power Electronic Systems Laboratory has discovered the effective way to reduce the costs of producing hybrid cars. Plesko described that the inverters and DC/DC converters play a crucial role in the hybrid motors. It’s also being known as the main reason, why the producing costs are so expensive for the hybrid motors. For overcoming the inverters and DC/DC converter, Plesko has developed a system with more powerful yet cheaper inverter and DC/DC converter. She is very confident that the thesis is going to be worked for real engine power.[sciencedaily]