. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. TRANSDUCERS loudspeaker (both these values being for a current of 1 amp in 3 ohm coils). With this force available, it is possible to use a very stiff spring across the transducer to raise its output impedance; movements of the order of 1 mm are possible, the resonant frequency then being of the order of 200 c/s. '/y/y. Armature control spring Figure Moving-iron transducer with reasonable linearity Another configuration of this type of transducer is used in the moving-coil meter (Fig
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. TRANSDUCERS loudspeaker (both these values being for a current of 1 amp in 3 ohm coils). With this force available, it is possible to use a very stiff spring across the transducer to raise its output impedance; movements of the order of 1 mm are possible, the resonant frequency then being of the order of 200 c/s. '/y/y. Armature control spring Figure Moving-iron transducer with reasonable linearity Another configuration of this type of transducer is used in the moving-coil meter (Figure ). This is capable of only a very small mechanical output, and in its usual form has a very low resonant frequency. An ordinary moving-coil meter has however been adapted as an electrically controlled torsion balance; other similar applications when a small force only is required may suggest themselves. Pen. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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