Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 236 MISCELLANEOUS TRANSDUCERS cycles. This cutoff can be made any value up to 15,000 cycles by a suit- able choice of constants. ^TJOT^ EQUIVALENT CIRCUIT / 'â â â ^^ -' ,â ' ~^ N / \ CRYSTAL NEEDLE ''IcCmcI'mc CROSS-SECTIONAL VIEW '' ''' FREQUENCY Fig. Cross-sectional view and equivalent circuit of the mechanical system of a crystal pickup. In the equivalent circuit: Zmr the mechanical impedance of the record. Cmo the compliance of the needle. m\ the mass of the needle hold
Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 236 MISCELLANEOUS TRANSDUCERS cycles. This cutoff can be made any value up to 15,000 cycles by a suit- able choice of constants. ^TJOT^ EQUIVALENT CIRCUIT / 'â â â ^^ -' ,â ' ~^ N / \ CRYSTAL NEEDLE ''IcCmcI'mc CROSS-SECTIONAL VIEW '' ''' FREQUENCY Fig. Cross-sectional view and equivalent circuit of the mechanical system of a crystal pickup. In the equivalent circuit: Zmr the mechanical impedance of the record. Cmo the compliance of the needle. m\ the mass of the needle holder. Cm\ the compliance of the shaft. Cuirui and CmzTmi the compliances and mechanical resistances of the crystal sup- ports, mc-, Cmc and tmc the mass, compliance and mechanical resistance of the crystal. m^ the mass of the pickup and tone arm. Ju the force generated by a constant velocity generator. The graph shows the voltage response characteristics with the record charac- teristic of Fig. A. Open circuit response characteristic. B. Response characteristic with 500,000 ohms shunting the crystal. 2. Magnetic Pickup.âA magnetic pickup ^'^ is a phonograph pickup whose electrical output is generated in a coil or conductor in a magnetic field or circuit. A typical magnetic pickup is shown in Fig. The
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Photo credit: © Bookworm / Alamy / Afripics
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Model Released: No
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