# Electronics Projects

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### Electronics Projects: How to Switch between Two Lamps

There is more than one way to switch the electronic circuit between two lamps or any other electronic power components. This shows two different ways to accomplish the task.

### Electronics Projects: How to Build a Switched Lamp Circuit

Building a switched lamp circuit presents a simple electronics construction project that lets you explore the use of a simple on/off switch to control a lamp.

### Electronics Projects: How to Build Series and Parallel Circuits

Whenever you have circuits that consist of more than one electronic component, those electronic components must be linked together. The two ways to connect components in a circuit are in series and in

### Electronics Projects: How to Build Series and Parallel Switched Circuits

Just as lamps can be connected in series or parallel in an electronic circuit, switches can also be connected in series or parallel. For example, two circuits that each use a pair of SPST switches to turn

### Electronics Projects: How to Build a Three Way Lamp Switch

Many homes and offices have hallways that have a light switch on both ends. You can turn the light on or off by flipping either switch. This kind of switching arrangement is called a

### Electronics Projects: How to Use LEDs to Detect Polarity

In this project, you build an electronic gadget that uses two LEDs to indicate the polarity of an input voltage. The voltage is provided by a 9 V battery connected to the circuit via a DPDT knife switch

### Electronics Projects: Charging and Discharging a Capacitor

One of the most common uses for capacitors in an electronic circuit is to store a charge that you can discharge when it's needed. Project 3-1 presents a simple construction project on a solderless breadboard

### Electronics Projects: Block DC while Passing AC

One of the important features of capacitors in electronics circuits is their ability to block direct current while allowing alternating current to pass.

### Electronics Projects: How to Use a Diode to Block Reverse Polarity

Although diodes look a little like resistors, they behave very differently in electronic circuits. Diodes have one ability that sets them apart: They let current flow freely in one direction, but block

### How Rectifier Circuits Work in Electronics

One of the most common uses for rectifier diodes in electronics is to convert household alternating current into direct current that can be used as an alternative to batteries. The rectifier circuit, which

### Electronics Projects: How to Build an LED Flasher Using an Oscillator

An electronic circuit that generates repeated waveforms is an oscillator. The exact waveform generated depends on the type of circuit used to create the oscillator. Some circuits generate sine waves, some

### Electronics Projects: How to Build an LED Driver Circuit

In this project, you build an electronic circuit that uses a transistor to switch on an LED using a current that's much smaller than the LED current. When you close the switch, both LEDs light up. However

### Electronics Projects: How to Build a NOT Gate Circuit

A gate is a basic component of digital electronics. Gate circuits are built from transistor switches that are either ON or OFF. There are a total of 16 different kinds of gates.

### Electronics Projects: How to Make a One-Shot Timer

In this project, you build an electronic circuit that uses a 555 timer chip in monostable mode. When a trigger switch is pressed, an LED lights and stays lit for approximately five seconds. Then, the LED

### Electronics Projects: How to Make an LED Flasher Using a Timer Chip

In this project, you build an electronic circuit that uses a 555 timer chip to alternately flash two LEDs on and off. Then, you modify the circuit so that the circuit is controlled by two pushbuttons that

### Electronics Projects: How to Make a Beeper

In this electronics project, you use two 555 timer chips to build an audible beeper, with both timers configured in astable mode. Each time controls a different audible tone on the beeper.

### Digital Electronics Projects: How to Use Switches to Build Gates

To give you an idea of how basic gates work, these electronics projects show you how to assemble an AND gate, an OR gate, and an XOR gate using simple DPDT knife switches. In actual practice, gate circuits

### Electronics Projects: How to Write a PBASIC Program

You can use a BASIC Stamp microcontroller to create some special effects in your digital electronics projects. But first you have to learn how to write programs to control the controller. If you’ve never

### Electronics Projects: How to Flash an LED with a BASIC Stamp

A BASIC Stamp is serious overkill for an electronic circuit that simply flashes an LED on and off: You can do that for a few bucks with a 555 timer integrated circuit

### Electronics Projects: How to Flash Multiple LEDs with a BASIC Stamp

This electronics project begins by connecting 6 LEDs to the breadboard in a BASIC Stamp HomeWork board and then continues by showing the programming necessary to flash all of the LEDs on and off. You can

### Electronics Components: How to Detect Infrared Light

There are several ways to detect infrared light in an electronic circuit, but the most common is with a device called a phototransistor. You can buy a phototransistor for less than a dollar at RadioShack