Balanced input phonograph preamplifier circuit

Details Balanced input phonograph preamplifier circuit Balanced input phonograph preamplifier circuit

1979-08-28

1981-10-06

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330109, 330294, 330304, 360 67, H03F 345

Patent

active

042938236

ABSTRACT:
A balanced input phonograph preamplifier circuit according to the present invention incorporates a matched differential pair of transistors having a gain control system therefor and having a load matched to standard phonograph cartridge output characteristics by means of a 47,000 ohm resistor and a capacitor that is designed for the particular cartridge involved. A differential voltage amplifier is defined by the matched differential pair of transistors functioning in conjunction with a differential amplifier which is in the form of an operational amplifier functioning in the differential mode. The output signal of the differential voltage amplifier system is processed by a deemphasis network incorporating a voltage amplifier and a current amplifier that are bridged by a feedback loop that is designed specific to the equalization curve of the Record Industry Association of America. Each channel of a stereo phonographic system will incorporate a differential voltage amplifier circuit and a deemphasis network that may be substantially identical.

REFERENCES:
patent: 4139825 (1979-02-01), Inoue et al.
Heatun, "CMOS Magnetic Cartridge Pre-Amplifier", Practical Electronics, vol. 12, No. 10, p. 823, Oct.1976.

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