![]() The power supply input is susceptible to transient events. A fuse and varistor are often placed at the mains input of the power supply for overcurrent and overvoltage protection. This means that it stands at a high risk of being damaged in the event of a transient surge if left unprotected. The 12V power supply is the first module that comes in contact with the mains. Therefore, a 12V SMPS power supply is more efficient but at the cost of an increased risk of EMI emission. This is where a switch-mode power supply is often a better alternative.Īs the name implies, a switch-mode power supply (SMPS) features a power management IC that alternates the state of the DC voltage with high-frequency switching. The regulator gives off tremendous heat when the load current increases. While DC power supplies for 12V are easy to build, they can be incredibly inefficient when driving a large load. The choice of the DC regulator determines the output load that can be handled by the power supply. Generally, you could classify a 12V power supply by its operation of linear or switch-mode.Ī linear 12V power supply is easy to build, as it involves a transformer, diode bridge circuit, a 12V DC regulator and bypass capacitors to minimize fluctuation of the voltage. Most systems convert the incoming AC into 12V DC before stepping down further into 5V, 3.3V or 1.8V.īuilding a 12V power supply may seem a straightforward task, but you could run into some unexpected issues if you overlooked some important points. If you’re working on commercial products like alarm systems, data acquisition or audio interfaces, you’ll often have a 12V supply connected to the primary control modules. It’s true that there are ready-made power supply modules, building one alongside the main circuit is often more economical and space-saving. ![]() While I don’t literally build a door on my workstation, I do occasionally need to design a dedicated 12V power supply on the PCB. One of my favorites that helps me to break an impasse sounds like this ‘if an opportunity doesn’t knock, build a door.’ I try to take this same positive approach in electronics design: often waiting for your boards to tell you what’s wrong with the design will result in a cost-inefficiency and a waste of prototyping runs. I’m a self-help junkie and digesting motivational quotes in the morning helps to kickstart my day with a bang. There are formidable challenges in building a good 12V power supply. Minimize potential threats to your 12v power supply such as EMIįor further discussion, what thermal analysis and regulations could you put in place to regulate your power supply?.Understand what threats there are to your power supply.Discuss the components and factors for building a DC power supply.Many of these problems take more than one or two steps, so look at it as a puzzle and put your pieces together!īelow you can download some free math worksheets and practice. If you don’t remember that last step, don’t worry! You can just take two more steps and find the 3 rd angle of the bottom triangle and subtract it from 180°to find the exterior angle. We need a few pieces of the puzzle before we can find the measure of x. They ultimately want to find the measure of that exterior angle. ![]() There’s actually at least three different ways that you can answer this problem. ![]() Find a piece at a time and put them together until you reach your answer! You have to look at these problems as “puzzles” because sometimes you need to find a part that they are not asking for in order to find the final result. Let’s see if we can put these properties to work and answer a few questions. So, in EVERY equilateral triangle, the angles are always 60°. This is because all angles in a triangle always add up to 180°and if you divide this amongst three angles, they have to each equal 60°. The angles, however, HAVE to all equal 60°. The sides can measure anything as long as they are all the same. When all angles are congruent, it is called equiangular. In an equilateral triangle, all sides are congruent AND all angles are congruent. Here are some diagrams that usually help with understanding. Since two sides are congruent, it also means that the two angles opposite those sides are congruent. Well, some of these types of triangles have special properties!Īn isosceles triangle has two sides that are congruent. We’ve learned that you can classify triangles in different ways. ![]()
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