What type of power does an STD bus system require?
Many STD Bus systems only need +5VDC, but some cards require +/-12VDC also. Especially the ones that contain analog circuitry. The amount of current needed will depend on the cards used but could be as high as 10 amps or more on the +5 rail. Linear and switching supplies Two common types of power supplies are switchers and linear. Switchers are now the most popular due to their size and cost. Linears normally need a larger transformer but supply cleaner power and offer simplicity of design. Many switchers have a minimum current draw requirement for them to regulate properly – make sure to check the specs of your system and supply. Regulation should be better than 5% in most cases. Packaging The power supply on most systems is contained within the STD card cage. Read those data sheets It’s important to spend a little time and read the vendor’s data sheets carefully for power requirements. It’s smart to have excess current capacity to maintain your future expansion options. With a little
