About the article

PC Audio Amp

2 x 180 WPMPO Mini Amplifier

PC Audio Amp
This stereo amplifier uses a low cost, and widely available audio IC. The TDA2822M from ST Microelectronics. With the addition of a few passive components it is possible to build a low cost stereo amplifier featuring a good impulse response, ideally suited for connection to a PC soundcard.Looking at today’s compact active loudspeaker systems for PC’s you can only marvel at the quoted power output that such small units can produce. A closer inspection reveals that the power quoted is not the generally accepted and well defined continuous power rating of the amplifier but rather its Peak Music Power Output (P.M.P.O.). This rating gives an indication more of the ability of an amplifier to reproduce impulses rather than its continuous output power rating.
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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,R2 = 5k?6
R3,R4 = 33k?
R5,R6 = 10k?
R7...R10 = 4?7
R11,R12 = 12? >2W
R13 = 680?
P1 = 47k? logarithmic, stereo
C1,C2 = 2µF2 MKT, raster 5 or 7.5mm
C3,C4 = 10µF 63V radial
C5,C6 = 10nF
C7-C10 = 100nF
C11,C12,C15,C16 = 2200µF 16V radial, dia. ?12.5 mm
C13,C14 = 390pF
D1,D2 = 1N4002
D3 = LED, rot (not highefficiency)
IC1,IC2 = TDA2822M (8-pin DIP) (ST Microelectronics) (Farnell)
K1,K2 = 2-way PCB terminal block, raster 5mm
K3 = 2-way PCB terminal block, raster 7.5mm
B1,B2 = B80C1500 (80V piv, 1.5A peak) (rectangular case)
TR1 = 2x9 V/4VA5 (e.g., VTR4209 (Monacor/Monarch)
F1 = fuse, 100mA, time lag, with PCB mount holder
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