105 W 6 Channel Surround Sound:  This reference design allows customers with limited knowledge of digital audio amplifiers to quickly build solutions, which meet Dolby, EMI and FTC standards, reducing the time-to-market for new consumer audio products. This 6 channel reference design, based on the TDA8925ST and TDA8926J power stages, is available with an output power of 5x15 W + 1x30 W.  (circuit design added 3/05)

Allpass Network Shifts Signals 90°:  04/27/95 EDN-Design Ideas / (added 1/03)

Digital Delay Unit for Surround Sound:  (added 9/02)

Quadraphonic Amplifier:  This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. (Electronic Schematic / circuit added 4/02)

Simple Surround Processor:  Simple Surround Processor. This is built with only conventional parts, and digital delay block, too. So it is very easy to build.  (Circuit / schematic design added 6/06)

Simple Surround Sound Decoder:  (Electronic circuit added 4/05)

Surround Processor:  Simple Surround Processor. This is built with only conventional parts, and digital delay block, too. So it is very easy to build.  (Circuit / schematic design added 6/06)