Ton Giesberts
About the article

One-IC audio power amplifier

designed for in-car use, 50+ watts from a 12 V battery

One-IC audio power amplifier
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.
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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 = 1M?
R2 = 4k?7
R3 = 1k?
R4 = 100k?
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
D1 = high-efficiency-LED
IC1 = TDA1562Q (Philips)
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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