One-IC audio power amplifier
designed for in-car use, 50+ watts from a 12 V battery
Published in issue 285, February 2000
The integrated output amplifier described in this article consists of little more than one integrated circuit. It is intended especially for use in motor vehicles and other batteryoperated applications. Although it appears simple and hardly worth looking at, the amplifier can produce an appreciable audio power output.Amplifiers come in all sorts. Most of the amplifier designs published in this magazine are intended for domestic or studio use. As such, they are usually powered by a 60–150 V supply, which may, moreover, be further divided into two balanced voltages. This makes these amplifiers unsuitable for use in motor vehicles.Amplifiers that can operate from a 12 V supply are quite different units, designed as they are for low-voltage supplies. If, moreover, they are required to provide a substantial power output, their design is far from simple.
Resistors:
R1 = 1MΩ
R2 = 4kΩ7
R3 = 1kΩ
R4 = 100kΩ
Capacitors:
C1,C2 = 470nF
C3,C4 = 10µF 63V radial
C5,C6,C8 = 4700µF 25V radial (18mm max. dia., raster 7.5 mm)
C7 = 100nF, raster 5 mm
Semiconductors:
D1 = high-efficiency-LED
IC1 = TDA1562Q (Philips)
Miscellaneous:
S1 = single-pole on/off switch
Four spade connectors, PCB mount
Heatsink for IC1 (Rth<2.5 K/W)
PCB, order code 000004-1
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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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