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Zagcom >> Links>> Electronic Circuits >>Audio circuits >>Surround sound ,Digital audio cir.

Surround sound ( 3 ) :

Simple Surround Sound Decoder - three simple surround decoder circuit ideas
Surround Sound Decoder MK1 - designed to extract the rear channel from Dolby-encoded film soundtracks, very simple design
Surround Sound Decoder Mk2 - fully featured surround decoder

Andrew's S/PDIF Stuff - S/PDIF converter circuits
Coaxial S/P-DIF output for the DTC790 - For this modification you have to things to your DAT recorder that surely void your warranty but will add coaxial S/PDIF interface to it.
Optical output for Creative Infra CD-ROM - little circuit to connect your MD or DAT to your CD-ROM drive with standard optical S/PDIF cable, based on TOTX173
SPDIF Circuits - input and output interfacing circuits
S/PDIF Coax to Optical conversion - This is a set of instructions for constructing your very own digital coaxial to optical converter.
SPDIF RCA to (Optical + RCA) Adapter

A SCMS killer circuit - should work with all DAT decks that have a Sony CXD2601 signal processor, published in September 1992 in "Stereoplay", also available at
Copybit deleter - sets the copybit in digital audio signals to enable copying of digital recordings
Defeat SCMS page - SCMS removing circuit for Sony DTC790 DAT recorder using a circuit designed for recorders with a CXD2601 chip.

CS8420 is asynchronous sample rate converter chip datasheet - includes example circuits, pdf file, check also

AC-3 for the CLD-1090 and CLD-XXXX - how to add an AC-3 RF output to older laser disc player
CDplayer's Project - information to make and upgrade a CDPlayer at home
Common AC-3 RF Circuit Designs - The following circuits are three popular AC-3 buffer designs used in most laserdisc players currently on the market. Since all the designs are simple variations of an emitter-follower, these circuits act as current buffers with the ability to change the DC level for muting.
DIY Dolby Digital Modification Page - Do-It-Yourself Dolby Digital (AC-3) Laser Disc Player Modification Page
The d-box in a better look - Everything described here relates to the Mediamasterďż˝? 9200, 9500 and 9600 as well as to the d-boxďż˝? available until december 1999. This page described how to add S/P-DIF Output to this DTV box.

120 Second Voice Recorder - Record as many messages as you can in this modern, non- volatile, combined audio processing & memory chip from Information Storage Devices (
Velleman K8030 Electronic Recording/Playback Module - Up to 20 seconds of recording time, EEPROM technology, speaker and line outputs and microphone input. Option for message selection switch. This circuit is based on ISD1400 IC. Kit manual has full circuit diagram.