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Consumer Electronics by S. P. Bali

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INTERNAL ORGANISATION OF A CALCULATOR

The diagram in Fig. 46.4 will help us figure out how a calculator works. Figure 46.4 shows three components : the keyboard, the seven-segment displays and the power supply. These parts are the only functional ones not contained in the single LSI IC in most calculators. The keyboard is obviously the input device. The keyboard contains simple normally open switches. The decimal display is the output. The readout unit in Fig. 46.4 contains only six seven-segment displays. The power supply is a battery supply in most inexpensive hand-held calculators. Many modern caculators use solar cells as their power supply. CMOS ICs and LCD make this supply feasible.

The calculator chip (the IC) is divided into several functional ...

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