PC Audio Amp
2 x 180 WPMPO Mini Amplifier
Published in issue 293, November 2000
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.
Resistors:
R1,R2 = 5kΩ6
R3,R4 = 33kΩ
R5,R6 = 10kΩ
R7...R10 = 4Ω7
R11,R12 = 12Ω >2W
R13 = 680Ω
P1 = 47kΩ logarithmic, stereo
Capacitors:
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
Semiconductors:
D1,D2 = 1N4002
D3 = LED, rot (not highefficiency)
IC1,IC2 = TDA2822M (8-pin DIP) (ST Microelectronics) (Farnell)
Miscellaneous:
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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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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