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Here, we explain the general concept of using an operational amplifier for voltage regulation. By utilizing an op-amp and few other external components, we can easily build a linear voltage regulator. Apart for being a regulator, the same circuit is also a voltage stabilizer, able to stabilize voltage at a grade better than 0.01%. The circuit is powered from a non-stabilized DC-power source, and uses a transistor (T1) inside a feedback loop. The transistor is used to supply the load with much more current than the op-amp itself could possibly supply. The D1 diode is a Zener - type diode and it is used for voltage reference.
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When we talk about rectifiers, the first thing that comes to mind is power supplies, but rectifiers are also used in many other circuits. Converting AC to DC is necessary in many high-precision signal processing circuits, and most circuits that measure real-world quantities first have to rectify sensor voltages. But even though regular diodes and bridges are adequate for many rectifying jobs, sometimes a different approach is needed.
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In the current article, we will turn our attention to the basic concepts of Linear Power Supplies. All circuits require some source of power to operate and the most convenient source of such power is an AC wall outlet. Unfortunately, most of electronic circuits cannot make use of AC directly. Instead, some way to convert the AC to DC is required.