usb cell phone charger circuit schematic

The schematic for this project is significantly more complex than previous designs. There are four primary features in the design: (1) the ability to program the PIC microcontroller on the developed board, (2) control of a servo motor, (3)...

The Johnson 275 watt and Kilowatt Matchboxes are often seen as exaggerated and unfairly criticized. They are neither exceptional tuners nor poorly designed. The main drawbacks include the fixed coupling link and the fact that they are balanced voltage...

This circuit is a simple mixer circuit that can mix two signal channels into one output channel. It utilizes a codec circuit to convert stereo audio into mono audio. Additionally, the circuit can increase the number of channels by...

This article describes a circuit for a simple single-cell lithium-ion battery charger utilizing the LP2391 regulator IC. The circuit presented is designed for charging a single-cell lithium-ion battery efficiently. The LP2391 is a linear voltage regulator that provides a constant...

A telephone ringer capable of making any mains-powered device operate from the ringer of a fixed line telephone. This device allows the control of a high-powered siren or horn to amplify the low-level sound of a telephone, making it...

This project involves a simple and cost-effective transmitter designed for hobbyists and home experimenters, capable of transmitting speech over a short distance. It functions as a cordless microphone, utilizing two integrated circuits from Maxim. The first IC, MAX4467, acts...