Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1982-06-14
1984-06-26
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330256, 330284, 330145, H03G 330
Patent
active
044568860
ABSTRACT:
A voltage controlled attenuator includes a control circuit having variable impedance means whose impedance varies in a stepwise fashion as an input voltage is varied. In this manner, the attenuation characteristic of the attenuator can be made to vary stepwise in slope or inclination to improve its efficacy for use as a volume control device in audio apparatus.
REFERENCES:
patent: 3582807 (1971-06-01), Addis
Fujimoto Hideki
Kawanabe Yoshihiro
Nishioka Akira
Takahori Hiroyuki
Mottola Steven J.
Mullins James B.
Pioneer Electronic Corporation
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