Essentials of Mechatronics

Chapter 5 - Electronic Design

Knowing nothing more than the rudiments of circuit theory, it is possible to
use catalog components to design amplifiers, filters, discriminators, and even
an elementary analog-to-digital converter.

Those rudiments must include knowledge of how to calculate values for
the combination of passive components (resistors, capacitors, inductors) in
series and parallel and the analysis of circuit loops by Kirchhoff’s methods.
Familiarity with Norton and Thevenin’s theories would also help.

The catalogs are full of semiconductor devices, many costing no more than
10¢ and few costing more than $5. They range from elementary amplifiers
and logic circuits, through comparators, counters, multichannel ADCs, power
transistors, magnetic and optical sensors, and many of the embeddable
microcomputers.

In the same catalogs you are likely to find plug-in systems to solve your
problems. These, however, are likely to cost a hundred times as much. Being
designed to address the problems of a hopefully large client base, it is unlikely
that they will be the best fit for your specific application.

It is well worth gaining expertise in putting your own circuits together.


5.1   THE RUDIMENTS OF CIRCUIT THEORY

Circuits can be arranged as networks, as in Fig. 5.1, nodes joined by meshes
to form loops. The laws and equations can be expressed in many ways, but
can be summed up as described in the following paragraphs.

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