Circuits & Schematics Power - 19

Set a regulator's output voltage under microprocessor control. Aruna Prabath Rubasinghe, University of Moratuwa, Moratuwa, Sri Lanka; Edited by Martin Rowe and Fran Granville EDN, February 3, 2011 The LM317T from National Semiconductor is a popular ...

A MOSFET and IGBT guide current to safe places JB Castro-Miguens, Cesinel, Madrid When switched-mode power supplies, including those for notebook computers, turn on, the bulk capacitor of the uncontrolled rectifier is completely discharged. This ...

The performance of solar-powered electronic devices may suffer in twilight conditions. In particular, microprocessors often used to perform solar power conditioning (such as in maximum-power-point trackers) do not like unstable power or smooth ...

Pratik Panchal Many a times you need to power an adjoining accessory circuit from the power supply used in the main module circuit. Here is a circuit to derive the additional power supply from the main circuit. The main circuit is protected from ...

Ronald Moradkhan Many industrial applications demand high-resolution control of an output current. The circuit in the figure handles that requirement by generating a 0-5 A output current with 14-bit resolution. A serial digital signal controls a ...

Designing a product for low-power battery operation usually means maximizing the battery life by operating the circuit on as low of a supply voltage as possible. This design used a custom LCD but, due to the number of display segments (160), a ...

Charles Wenzel This little gadget uses a small 3 volt solar cell to charge a 6 volt NiCad battery pack which, in turn, may be used to charge many models of cell phones and other portable devices. The circuit scavenges energy from the solar cell by ...

This simple TTL power supply monitor circuit monitors the 5-volt level TTL power line and gives a signal whether the supply voltage is outside or within the necessary range or “window”. The heart of the power supply monitor is a ...

Nick Ierfino, Concordia University To properly control AC sources using solid-state devices, you need a pulse to signal the start of the AC’s rising edge. Most of the time, however, tremendous noise levels plague power lines. There needs to ...

Principle and Working The project of cell charger shown here uses IC( 7808 ) and transistor ( BC547B ). The transformer TR1 is a step down transformer, and steps down 230V AC voltage to 12V AC. This 12V AC is fed to the rectifier bridge. Four ...