Methods and apparatus for microphone preamplification

Details Methods and apparatus for microphone preamplification Methods and apparatus for microphone preamplification

1993-06-03

1994-10-18

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including particular power supply circuitry

381121, H03F 2100

Patent

active

053572149

ABSTRACT:
Preamplifying circuitry amplifies sound signals for input into a computer system. A first stage common-emitter amplifier provides high-gain amplification of the input signal, while a second stage amplifier comprising an operational amplifier is suitable for driving a cable with the amplified sound signal. A low-cost constant voltage source comprising a diode and an operational amplifier supplies a voltage reference to both amplifier stages with a very high rejection of system noise. The circuitry and methods of the present invention provide a low-cost, easily manufactured preamplifier suitable for sound input in desktop computing devices.

REFERENCES:
patent: 3296546 (1967-01-01), Schneider
patent: 5053720 (1991-10-01), Mizumoto
patent: 5281906 (1994-01-01), Thelen
Diers, Tracy, "Transistorized Preamp and Control Unit", Popular Electronics Sep. 1958 pp. 61-63.

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