Many circuits today not only require voltage regulation butthey also need current regulation. Some systems draw excessivecurrent during power on, which can cause expensivesystem components to burn up due to improper powering ofsupplies. This is not the only problem associated withexcessive currents. Some applications need to limit thecurrent an op amp can provide to a specific load. This circuitcan provide this type of function by making constant currentsources out of simple regulators.
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