400W car power amplifier. Based on a push-pull converter with TL494 (KA7500) driver, 500W of power is enough for four TDA7294 integrated amplifiers. Three three-digit multimeters on front-panel shows actual battery voltage, temperature, and estimated output power.
4x100W car audio amplifier – [Link]
The PIC32 acts as USB host to the attached memory stick, which contains all my favorite tunes in .sid format from the HVSC. I used Elm Chan’s FatFs library because it hat LFS (long filename support) together with the Microchip USB stack.
PIC32 drives SID audio chip update – [Link]
After doing some project with vintage tube I got the idea of doing a audio spectrum display with “magic eyes tube”. and drive those with a AVR MCU with Fast Fourier Transform
Vintage Audio Spectrum Display – [Link]
The purpose of this project is to make an audio visualizer to demonstrate the use of the Nokia 3310 LCD as a graphical display. By audio visualizer, I mean the visualization like Winamp, XMMS, or Windows Media player. This project utilizes a fixed point FFT (fast fourier transform) algorithm to convert the discrete audio samples in time into frequency. This allows us to graph bars for each frequency as the music is playing. In other words, different bars dance around for the bass, midrange, treble, and all the points in between.
Audio Visualization with Nokia 3310 LCD and FFT - [Link]
I love the LM386. It’s a complete amplifier in an 8 pin DIP chip! All that is needed to build an audio amp are a few external components most of which are decoupling capacitors. It is well suited to low power applications and runs just fine on a 9 volt battery or any voltage supply from 4-12 volts. It has a low quiescent current drain of only 4mA so it won’t kill a battery right away if you leave it on and idle. The gain is internally set to 20 but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200. An increase in bass frequency can be facilitated by adding a 10K resistor and .033 uf capacitor in series between pins 1 and 5.
The 1/2 watt LM386 Audio Amplifier – [Link]
Markus shared his latest SID player in the project log forum:
I am currently working on a kind of hybrid between an emulated and a real SID Player. The CPU and CIA stuff runs emulated on a PIC32 and the sound is generated by a hardware SID chip.
I had the TinySID emulator already running on the PIC32 in the past, and now had the idea, that it would be cool to have the sound being generated by a real SID. To say it with NVIDIA’s words: The way it’s meant to be played
PIC32 drives SID audio chip - [Link]
dangerousprototypes.com writes: [via]
Beth from scanlime has posted a detailed explanation of her development of an S/PDIF encoder object for the Parallax Propeller.
The source code is open under an MIT-style license. If you’re a Propeller enthusiast it should be easy to implement this code to give your next sound project a digital output. Beth hopes that this code will inspire non-Propeller users to explore digital audio on a different microcontroller platform!
S/PDIF Digital Audio on the Parallax Propeller – [Link]
The Mini AV Test Box is a self countained VGA/3.5mm Audio output device for testing to see if speakers or monitors are working in a quick and easy way. The VGA signal output is simply 3 blocks of Red, Green and Blue. The audio output is a single tone that can be changed with a trimpot/knob.
Mini AV Test Box – [Link]