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.
Power supply kit can be used to power a wide range of projects including Arduino, Raspberry Pi or other circuits where multiple voltage levels may be required. It works fine with my AVR DDS 2.0 signal generator, and I think to use it in the next version whenever it is completed.
Power supply kit contents
The kit doesn’t include any schematics or instructions – only PCB and electronics parts. In the other hand, they have done an excellent job by putting all required information on the silkscreen. Even if you aren’t experienced in assembling and soldering it will be easy to solder.
Sometimes I find it relaxing to solder such kits; all you need is to pick parts and place them without overthinking. After I finished, it worked right away, and all voltages on the output were within specks. Linear regulators 7805, 7812, 7905, 7912, and 1117 are pretty robust at regulating.
If you are considering to power higher loads with this power supply module, better use at least 12V DC on the input instead of USB 5V because USB supply is limited in current and you may notice the drop on the output. Other than that seems to be a great cheap module.
And last thing – the LEDs that come with this kit is too bright. Suppose you would instead replace them with diffused. The package can be found here.