One of my projects (AVR DDS 2.0) requires multiple power supply that could supply +12V, -12V, and 5V. Back then I have constructed simple transformer based power source with few linear voltage regulators. It works fine, but is powered from mains 220V which is not safest solution to squeeze in to box enclosure. Other option was using ATX PC power supply, but it is too big. Banggood have been offering pretty neat power supply kit which has voltage boost circuit which rises voltage level either from USB or from 5-24V jack.
Power supply kit has most of 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 short-term high current single output, but be sure to attach included heat sinks in order 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 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 next version when ever it will be completed.
Power supply kit contents
The kit doesn’t include any schematics or instructions – only PCB and electronics parts. In other hand they have done great job bu putting all required information on silk screen. Even if you aren’t experienced in assembling and soldering it will be easy to solder.
Sometimes I find it really relaxing to solder such kits, all you need is to pick parts and place them without thinking too much. 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 great cheap module .
And last thing – the LEDs that come with this kit is too bright. If you I would rather replace them with diffused. The kit can be found here.