![]() The TDA2003 is a cheap amplifier that is designed to run on single rail power supplies. power amplifier modules (left-to-right, top-to-bottom).› Tda2003 Pcb ▆ ▆ ▆ One watt of power delivered to a Collection of simple i.c. ![]() During the valve era, ten watts was considered adequate for the realistic reproduction of orchestral music, and some experts suggested a figure as low as five. When listening to talk programmes in a quiet domestic setting, the power fed to the speaker will hover around 50mW (0♰5W), and this is ample for the operator of a communications receiver whose ears are closer to the sound source. Clear reproduction in Walkman type earphones of reasonable sensitivity can be achieved with a miserly milliwatt (0♰01W). HOW MUCH POWER? Before considering the various circuits, it is worthwhile to reflect on the amount of power actually needed. Six alternatives are given and, with the requirement of maximum performance for minimum cost and effort, they are all based on widely available integrated circuits (i.c.s): B LM386N-1 B TDA7052 B TBA820M B LM380N B TDA2003. Although the circuits are capable of a good standard of reproduction, they will particularly interest the constructor who looks for plenty of performance per pound or dollar. This short series of articles describes simple, but effective, ways of meeting these different requirements. ![]() Speech communication, especially under difficult conditions, is greatly clarified if the frequency response is curtailed. Music reproduction calls for a wide frequency response and tone-control circuitry. And the amplification usually goes hand-in-hand with some form of signal processing. ![]() The final stages of radio receivers, intercom units, security and surveillance installations, or just a hankering for a big sound from a Walkman or portable CD player, all involve audio amplification and a speaker system. ![]() CCoonnssttrruuccttiioonnaall PPrroojjeecctt SIMPLE AUDIO CIRCUITS Part 1 – Introduction and Power Amplifiers RAYMOND HAIGH A selection of “pic-n-mix” low-cost audio circuits – from preamplifier to speaker! W HATEVER their particular area of interest, most electronics enthusi- asts encounter the need to amplify and reproduce audio signals. ![]()
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