Portable MP3 Player

Final circuit with pushbuttons (front right), MCU (front left),Multimedia card (middle left) and decoder/DAC board (gold board in back) Introduction In the recent years, the MPEG Layer...

Digital Multiple Voltage Power Supply

DescriptionThis is simple to build microcontroller controlled power supply that can switch between 5 (or 32 or more) preconfigured voltages between 1.2 to 33 volts dc and up to 3 amps. This guide will walk you through every aspect of the building process; however some basic familiarity with electronics and microcontrollers will be required to program the microcontroller. SpecificationsInput Voltage: 33 Volts DC* MaxInput Current:...

Low Cost Universal Battery Charger Schematic

Low cost solution for charging of both NiCd and NiMh batteriesHere is the circuit diagram of a low cost universal charger for NiCD - NiMH batteries. This circuit is Ideal for car use. It has ability to transform a mains adapter in to a charger . This one can be used to charge cellular phone, toys, portables, video batteries, MP3 players, ... and has selectable charge current. An LED is located in circuit to indicate charging....

Low Cost Universal Battery Charger Schematic

Low cost solution for charging of both NiCd and NiMh batteriesHere is the circuit diagram of a low cost universal charger for NiCD - NiMH batteries. This circuit is Ideal for car use. It has ability to transform a mains adapter in to a charger . This one can be used to charge cellular phone, toys, portables, video batteries, MP3 players, ... and has selectable charge current. An LED is located in circuit to indicate charging....

Hardware Control via SMS

System Overview The system consists of two mobile connected by the existing cellular mobile network. One of the mobile is connected to the computer by USB data cable. The computer contains the series...

Electronic Locker

This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker. This one is a unit of switches connected into 4 arranged...

Digital Stopwatch 0-60sec

IntroductionBy using the same circuit of the "Digital Stopwatch 0-99sec", we can add an AND gate, and transform the 0 – 99sec stopwatch to a 0 – 60sec stopwatch. We must find a way to control the...

Digital

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Led display digital Voltmeter

front sideCopyright of this circuit belongs to smart kit electronics. In this page we will use this circuit to discuss for improvements and we will introduce some changes based on original schematic....