Tape player preamplifier circuit

Details Tape player preamplifier circuit Tape player preamplifier circuit

G - Physics

11

B

352/20.8

G11B 15/04 (2006.01) G11B 15/16 (2006.01) G11B 15/18 (2006.01) G11B 23/00 (2006.01)

Patent

CA 1065478

TAPE PLAYER PREAMPLIFIER CIRCUIT Abstract of the Disclosure A preamplifier circuit for a tape player includes a voltage-follower transistor which is operable when turned on to establish the output bias voltage of the preamplifier circuit at substantially a reference voltage. In turn, a voltage divider network develops the reference voltage co- incident with energization of the tape transport mechanism. Due to the inertia of the tape transport mechanism, the speed of the tape remains below that necessary for undistorted operation during a start-up time period immedi- ately following energization of the tape transport mechanism. An RC network is responsive to development of the reference voltage to provide a time delay such that the voltage- follower transistor is prevented from turning on until after expiration of the start-up time period. Thus, the output bias voltage of the preamplifier circuit is not established until the tape speed is sufficient to permit undistorted operation.

256225

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