Device for switching on and off and adjusting the volume of comm

Details Device for switching on and off and adjusting the volume of comm Device for switching on and off and adjusting the volume of comm

1980-09-16

1983-05-17

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330278, 455233, H03G 330

Patent

active

043842607

ABSTRACT:
Improved apparatus for switching on and off and adjusting the volume of communications equipment employs a non-latching button, a delay element for producing a time delay determined by the pressure time on the button, a volume adjusting device for adjusting the amplification of an amplifier and a relay control for turning the amplifier off and on. The button is coupled to both the volume adjusting device and the relay control via the delay element in such a fashion that, depending on the delay time, either a switching or a volume adjustment results. An automatic shutoff can also be provided for shutting off the power supply to the amplifier after the loop current is interrupted.

REFERENCES:
patent: 3098212 (1963-07-01), Creamer, Jr.
patent: 3890592 (1975-06-01), Kitamura et al.
patent: 4087793 (1978-05-01), Lucas

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