If you can find an OTS power supply that appears to meet your needs, you should then consider the answers to the following questions before you choose to utilize it: This article hopes to address the most pertinent issues to consider and, in several places, adopts a checklist format for you to use. In other words, there is more stress on a power supply compared to most of the other parts of our design. With a power supply, the electrical environment is far less certain, and the power supply is likely to be handling much larger voltages and currents than all other components in our product. They are also very precisely defined regarding how they interface and what voltage supplies they need to perform their vital role. Of course, the same can be said for a product that relies on a central microprocessor or controller, but these items are usually sold in millions and are well-proven. Power supplies are no different, but there can be special considerations because, in many cases, if the supply fails, then so does our product. But what about power supplies? Power supply - Initial Considerations In other words, we “buy” at the lowest level but, if we can economically buy at a higher level, then we will do so. But, we will only go so far we don’t choose to “make” resistors, capacitors, transistors, diodes, or chips we use pre-built components from reputable manufacturers sold through a recognized supply chain and preferably, with second or multiple alternative sources. However, if there isn’t an obvious “buy” solution, we split our circuit into smaller segments and design at a more localized level. If we need an amplifier or some kind of signal processing circuit, we look for ready-made integrated circuits (ICs) with high-level functionality, respectable performance, and reasonable price. As engineers, we make decisions about whether to buy or build all the time.
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