Audio Power Amplifier with TDA2050

This project is an audio amplifier based on TDA2050 and LM1875. This is not an ordinary project, but an attempt to make a PCB that is suitable for TDA2050 and LM1875 and has all the necessary circuitry on board – power supply, speaker protection, delayed turn-on and fast turn-off. This is achieved using the convenient uPC1237 IC. TDA2050 and LM1875 are pin to pin compatible, the differences in their schemat ...

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Arduino Project 5: Digital audio player

So far in this series we’ve had a diverse look at how Arduino can interact with a range of real-world devices from servo motors to ultrasonic range finders TVs to humidity sensors. Now we’ll see if we could get the Arduino to make a few sounds. We’ll actually do a bit better than that – we’ll look at the importance of pulse width modulation (PWM) to microcontrollers by building our own digital audio player ...

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How to: Use Arduino to Generate Glitchy Audio VGA Visuals

This post is a guide for people that are interested in my previous posts about dual monitor VGA hacking (see 1, 2 and 3). You will need: • A laptop or a computer with a VGA output • A breadboard (optional) and some wires or a strip board for soldering • Wire and breadboard jumpers (optional) • 2 female VGA connectors • 1 male VGA connector • up to 3 lots of 15x1 or 15x2 pin headers (optional) • An Arduino, ...

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Analog audio panel for PC using Arduino

Have you ever struggled with audio settings in control panel in middle of a VoIP call? Or, wondered if the other guy can hear you properly? I have. My work requires great deal of remote conference calls using PC. The first thing I wonder always when starting is if my audio settings -- mic volume, input selection, mute/unmute, speaker volume -- are in order. Typically, they are not and it takes a while to fi ...

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Easy Arduino Audio Annoyatron

This simple device simple plays a small tune at a random interval, between 5 and 30 seconds when the lights in a room go off. It can be cleverly disguised inside a tissue box, or inside or under any number of household objects. This is a vary simple project (my first audio project) and requires vary few materials, most of which can be easily scavenged. If you are just starting with arduino or audio electron ...

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Microsemi expands audio DSPs

Microsemi has announced a family of DSP chips. Called Timberwolf, it is described as a third-generation DSP architecture designed with a proprietary 4 MAC core, dedicated hardware accelerators, and two independent 16bit DACs in 64pin QFN and 56pin 3×3 CSP packages. “This field upgradable DSP platform, when combined with algorithmic firmware, can enable beam forming, multi-channel acoustic echo cancellation, ...

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UnDecima Audio Output from Arduino

I already have one project where arduino outputs audio signal to USB speakers via software 10-bits PWM.  In first, I was not satisfied with quality of sound generated via PWM. There are just not enough speed in arduino engine  to run PWM well.  For example for 20.000 Hz audio, PWM has to be at least 2 – 3 times higher  above normal frequency range, or 40 – 60 kHz. If we multiply this value with 10-bits reso ...

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Audio Input to Arduino

The easiest way to connect an audio signal to your arduino, is to build a simple 3 components (2 resistors plus cap) circuitry shown on the first drawings on right side. Disadvantage: there is no amplifier, and consequently sensitivity would be low, hardly enough to work with headphones jack output.  For low level signals, like output of electret microphone, amplifier is necessary. Here is the kit, which in ...

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Representing audio through vibration with Arduino

This project functions to display sound using vibration.  You plug your iPod, computer, or TV into it and get tactile feedback representing the loudness of the audio.  It can help deaf people to experience sound. Stuff you need: Arduino USB Cable Computer running Arduino software (www.arduino.cc/download/) Breadboard LEDs Pager Motors Three 100K resistors Six 220uF resistors 1K potentiometer 3-Conductor Ste ...

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Talk Shield

Talk Shield description: Japanese speech synthesizer LSI: Micro Talk ATS001B (Act Brain) Talk Shield specification:   Talk Shield pinout:   For more detail: Talk Shield ...

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Twitter Enabled Text to Speech using an Arduino

Let the world know what you're eating for breakfast with an 80's style vocal synthesizer!  This project uses an Arduino to send your Twitter stream to a voice generator chip called the SpeakJet.  The setup that I use here can also be extended to other applications where you'd want to translate text into speech, some ideas: -a robot which announces things or responds to its environment by speaking -some kind ...

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Stereo Audio with an Arduino

Recently I've been posting a lot of projects that use an 8 bit resistor ladder digital to analog converter(DAC) and an Arduino to make sound.  (see the Arduino vocal effects box, the Arduino drum sampler, and my audio output tutorial).  The technique I've been using to make these DACs is very simple, it requires only a handful of 10k and 20k resistors wired together into a network.  But the convenience come ...

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