Ton Giesberts
About the article

PC Surround Sound Power Amplifier

implemented as a six-channel plug-in card

PC Surround Sound Power Amplifier
This six-channel amplifier has been designed to fit into either an ISA or PCI slot, with its supply derived from the PC. In conjunction with a set of (possibly home built) loudspeakers this forms the basis of an inexpensive yet good quality PC surround sound system.Although most PCs have come with a pair of speakers for a long time, the increasing popularity of DVD drives adds a new dimension. When the PC is provided with a five-channel software player and a sound card with five output channels, the sound section can be upgraded to a complete surround sound system.It is of course possible to use standard active PC loudspeakers. Most of these are very cheap, but the quality is nowhere near hi-fi. What other options are there? Connecting a full set of living room loudspeakers to the PC is somewhat over the top — both from a financial and a spatial point of view. We would think that most PC owners would rather choose from some of the inexpensive and compact hi-fi loudspeakers that are widely available in the marketplace, or possible even build their own. These types of loudspeakers are usually not active, which creates another problem: how can we drive such a surround sound system in a simple manner?
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1,R5 = 10kOhm
R2,R3,R4,R6,R7,R8 = 470Ohm
P1-P6 = 10kOhm preset
C1,C2,C3,C13,C14,C15 = 470nF
C4-C9,C16-C21,C26,C27 = 1000µ F 16V axial, dia. 10mm, lead pitch 28mm
C10,C22 = 10µ F 63V axial
C11,C23 = 47µ F 25V axial
C12,C24,C25 = 100nF
IC1,IC2 = TDA7370B (ST Microelectronics)
JP1,JP2 = 3-way pinheader with jumper
K1 = 4-way pinheader
7 off 3.5mm stereo jack socket, PCB mount
PC expansion slot cover
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