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What does LM stands for in series of voltage regulators?

Linear Monolithic


Can you put two 5v voltage regulators in series to get 10v?

No, you cannot put two 5V voltage regulators in series to obtain 10V. Voltage regulators are designed to maintain a constant output voltage regardless of the input voltage, and connecting them in series would not sum their outputs as you might expect. Instead, it could lead to instability or damage to the regulators. To achieve 10V, it's better to use a step-up (boost) converter or a dedicated 10V regulator.


What is the primary difference between the LM317 and LM337 regulators based on electrical engineering?

Both are 1.5A adjustable voltage regulators. The LM317 outputs a positive (with respect to ground) voltage, and the LM337 outputs a negative voltage.


Which is more efficient between series and shunt regulator and why?

Series regulators are generally more efficient than shunt regulators because they control the output voltage by varying the resistance in series with the load, minimizing wasted power. In contrast, shunt regulators divert excess current away from the load, often resulting in higher power dissipation and reduced efficiency, especially under varying load conditions. Therefore, for applications requiring better efficiency and stable output voltage, series regulators are typically preferred.


How voltage stays constant in a closed electrical circuit?

A voltage regulator. Examples are the 78dd series of regulators where dd is the voltage, e.g. 7805, 7812. These work with a positive rail, the 79dd regulators work with a negative rail.