Circuit Lake » Power Supply

12V Car Charger For Portable Notebook

admin — Thu, 09 Sep 2010 01:15:46 +0000

This project is good solution if you want charge your laptop inside your car. ASUS Eee 12v Car Charger circuit based on LM2576 “Simple Switcher” from National Semiconductor. The IC has lower drop-out voltage (~2V) which is important when powering the device from a car or 12v SLA battery. The charger uses PE92108KNL Inductor [...]

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Fast 7.2V NiCad Battery Charger

admin — Thu, 01 Jul 2010 22:09:29 +0000

This battery charger built using IC MAX713, a NiCad battery charger IC from Maxim. It will control the fast charge time and monitor the cell voltage. The project can charges a battery approximately 80% charge in 22 minutes at a current of 2.4 Amps. Once the fast charging has ended, it trickle charges the [...]

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PIC Based Intelligent NiCd/NiMH Charger/Cycler

admin — Mon, 28 Jun 2010 05:02:24 +0000

This PIC16F876A-based accu cycler project allow you to charge and discharge NiCd and NiMH accumulators for R/C modelers and others. It has performance close to commercial products in the market. The ‘intelligent’ part of the system can communicates with PC using serial port providing additional process visualization. The process graph is saved to on-board EEPROM [...]

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High DC Power Meter

admin — Fri, 18 Jun 2010 19:13:29 +0000

The Hibox is High DC Power Meter based on the Atmel Atmega16 microcontroller. This equipment is capable to measure DC voltage up to 40V, currents up to 200A (600A with special sensor) and shows all values on 2×16 characters display. It was developed for enhanced measurements on new Lion/Lipol batteries which are widely used in [...]

Dummy Load Project

admin — Tue, 04 May 2010 22:29:17 +0000

The dummyload project simulates loads from zero to 1000 mA to help characterize new power supply designs. This design can present a single load to the supply, or it can toggle between two loads with a selectable period and duty cycle. The project is built around microcontroller AVR ATmega169.The load circuit consists of a DAC, [...]

Emergency Power System

admin — Mon, 19 Apr 2010 21:48:40 +0000

The project shows you how to build PIC-based emergency power system for 12-Volt device system. The hearts of the project is PIC16F870. The system will monitoring battery voltage both charging and discharging currents, control 4 digit display, and switches the AC and load relays.“The basic operation is as follows: While AC power is available, the [...]

Simple USB Charger

admin — Wed, 23 Dec 2009 22:44:30 +0000

This is simple but very powerful USB charger project for your gadget like mp3 player, camera, cell phone, and any other gadget you can plug into a USB port to charge. Main component of the project is LT1302, Micropower High Output Current Step-Up Adjustable and Fixed 5V DC/DC Converters from Linear. The charger circuitry and 2 [...]