Content for Speaker

Speaker

A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; a device which converts an electrical audio signal into a corresponding sound. The most widely used type of speaker in the 2010s is the dynamic speaker, invented in 1924 by Edward W. Kellogg and Chester W. Rice. The dynamic speaker operates on the same basic principle as a dynamic microphone, but in reverse, to produce sound from an electrical signal. When an alternating current electrical audio signal is applied to its voice coil, a coil of wire suspended in a circular gap between the poles of a permanent magnet, the coil is forced to move rapidly back and forth due to Faraday's law of induction, which causes a diaphragm (usually conically shaped) attached to the coil to move back and forth, pushing on the air to create sound waves. Besides this most common method, there are several alternative technologies that can be used to convert an electrical signal into sound. The sound source (e.g., a sound recording or a microphone) must be amplified or strengthened with an audio power amplifier before the signal is sent to the speaker.

Play Audio from SPI Flash with a Microcontroller

“How to use a microcontroller to drive a speaker using PWM from audio levels stored in a SPI flash chip This project uses a microcontroller’s PWM output to drive a speaker and play audio stored in a SPI flash …

Mini Retro TV

“This instructables show how to make a mini retro TV. Note: This TV cannot receive analog TV broadcast signal but can play mini video tape (micro SD card). Supplies Below list only provide the searching keyword and product image, you …

Talking Wood / Pellet Stove High Temperature Sensor

“This tutorial is for building a talking extreme heat temperature sensor! It measures up to 1300˚F and speaks warnings and info! The Story I have a great wood stove, but sometimes wood stoves can be dangerous; for example if …

Arduino Soundlab

“A 3D printed Arduino Nano based synthesizer that produces a wide range of amazing sounds generated using the FM synthesis technique. Story About a year ago, a small synthesizer called Scout Synth was uploaded to Thingiverse by oskitone. I really …

‘Wild’ Animals Repellant Sensor

“The project is about creating a system that will help you scare away ‘Wild’ animals like dogs when they are on the attack. Story Any time the term Ultrasonic comes to our mind, we figure out the communication of the …

Space Invaders Mini Arcede With CRT

“I have built this Mini Cardboard Arcade using a B&W small CRT (Cathodic Ray Tube) recovered from an old video intercom. It is based on an Arduino Nano emulating the classical Space Invaders. The switch on the rear turns …

Designing a programmable sound generator board

“I’ve recently been getting into chiptunes, including both writing music as well as programs to generate the sounds that play the music. My interest in sound generation goes back to 2018, when I wrote a small library for TI …

The Monkey Island (TM) PC-Speaker music player

“- I modified DOSBox to extract the frequency/delay value pairs of the Monkey Island PC-Speaker songs. - I then used Huffman compression to squeeze all music inside an ATtiny85 (512 bytes of RAM, 8 KB of flash) - Once I managed …

Music & Lights Workbench for those new to programming

“Educational - to spark early interest in youngsters in computing, with easy constructions of cool music and light commands. Introduction The Music and Lights Workbench (MLWB) has been designed to introduce anyone new to or not familiar with the subject of …

DIY Electromagnetic Interference Detector

“I’m currently in the process of building my own CNC router. This router will be controlled by an arduino, and will help me in future DIY projects. However, there’s been some issues with the arduino randomly freezing, and …