Audio and Video

Very High Gain Audio Amplifier

This amplifier is designed to drive an 8 ohm speaker or phones to an extremely loud level at small input signal down to 700uV RMS. Although designed to be used with the parabolic microphone also listed on this site, this amplifier is also very well suited for use with any Crystal Set or other low signal output device. [more]

Posted in : Amplifier projects | Audio and Video

Make your own monopole antenna

This guide show you how to make two designs of monopole antenna for 900 and 1300MHz video transmitters because the antenna that comes with the 900 and 1300MHz video transmitters usually aren?t any good. In fact they are quite inefficient and due to bad design and build tolerances of certain crucial parts. You can however quite easily improve the efficiency and thus the range of these systems by using a tuned antenna. [more]

Posted in : Audio and Video | RF projects

Simple SD Audio Player

This is a simple SD audio player biult with only an 8-pin microcontroller. The ATtinyX5 series (25/45/85) 8-pin AVR microcontroller has two fast PWM outputs in 250kHz carrier frequency. This enables to output a wide frequency range audio signal.[more]

Posted in : AVR projects | Audio and Video | Sound related projects

PlayStand: “Put and Play” CD Player

PlayStand is a CD player. You can play CD by simply putting the CD to a stand. PlayStand identifies an RFID tag embedded in a CD case and plays corresponding MP3 songs to the ID. [more]

Posted in : Audio and Video | RFID projects

How to: Use Arduino to Generate Glitchy Audio VGA Visuals

The idea here is to connect the horizontal and vertical sync signals from the computer or laptop to the other monitors. However, the actual RGB data lines will be controlled by the Arduino or  Cand ADC.All that is happening with the software is that the Arduino or whatever is doing a digital data conversion and then setting an output digital pin port to the lower 8 bits of the 10 bit data.[more]

Posted in : Arduino projects | Audio and Video