Amplifying Heart Beats
A NEW development in the radio field is the apparatus recently installed. at the London University College Hospital. By means of this apparatus it is possible to amplify heart beats and still fainter sounds without disturbing the patient. The microphone, which is held in position by an elastic belt, is connected to a five-stage resistance Capacity coupled amplifier, designed to cut off at 1000 cycles. This is connected in turn to a two-stage trans-former-coupled amplifier, having low gain stages. Loudspeakers or head~ phones can be used, as desired. This apparatus has been found particularly successful in making the wanted sounds audible, while eliminating all extraneous noises.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300530.2.20
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Radio Record, Volume III, Issue 46, 30 May 1930, Page 5
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109Amplifying Heart Beats Radio Record, Volume III, Issue 46, 30 May 1930, Page 5
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