analog.com: AN-140: Basic Concepts of Linear Regulator and Switching Mode Power Supplies Citat: "...This kind of variable resistor can be implemented with a linear regulator, as shown in Figure 3. A linear regulator operates a bipolar or field effect power transistor (FET) in its linear mode. So the transistor works as a variable resistor in series with the output load....", backup
ariat-tech.com
ariat-tech.com: TL431 Voltage Regulator Detailed Guide, backup Citat: "...TL431 is a Three-Terminal Controlled Precision Reference Integrated Chip with Good Temperature Stability. Due to its High Accuracy, Low Quiescent Current, and Output Noise, it is Widely Used in a Variety of Electronic Devices..."
electronics-notes.com
electronics-notes.com: 7800 Series Voltage Regulators: 7805, 7812, 7824, etc, backup Citat: "...For many years the 7800 series linear voltage regulators, including the more popular versions of this series like the 7805, 7812, etc, were the most popular voltage regulator chips available and they were used in many electronic circuits, large and small. The 7800 series voltage regulators were very easy to use, they were cheap to buy, and they provided excellent performance..."
analog.com: AN-140: Basic Concepts of Linear Regulator and Switching Mode Power Supplies Citat: "...This kind of variable resistor can be implemented with a linear regulator, as shown in Figure 3. A linear regulator operates a bipolar or field effect power transistor (FET) in its linear mode. So the transistor works as a variable resistor in series with the output load....", backup
electronics-notes.com: 7800 Series Voltage Regulators: 7805, 7812, 7824, etc, backup Citat: "...For many years the 7800 series linear voltage regulators, including the more popular versions of this series like the 7805, 7812, etc, were the most popular voltage regulator chips available and they were used in many electronic circuits, large and small. The 7800 series voltage regulators were very easy to use, they were cheap to buy, and they provided excellent performance..."
ariat-tech.com: TL431 Voltage Regulator Detailed Guide, backup Citat: "...TL431 is a Three-Terminal Controlled Precision Reference Integrated Chip with Good Temperature Stability. Due to its High Accuracy, Low Quiescent Current, and Output Noise, it is Widely Used in a Variety of Electronic Devices..."