Transducer Bridges and Amplifiers
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In the previous chapter we discussed transducers for all the main forms of energy except the electrical form. Electrical transducers may be modifiers, selfgenerators or modulators, of course, but the most important here are those having an electrical output, such as amplifiers and bridge circuits, since these are usually required to follow the transducers already discussed. Both are strictly modulators, since they involve a separate power source which is modulated by the (small) electrical signal. It is necessary to consider these devices at this stage so that we can deduce the responsivities of the transducers to be discussed in the next chapter.
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