Volume control apparatus

Details Volume control apparatus Volume control apparatus

1980-04-07

1982-03-16

Cardillo, Jr., Raymond F.

H03G 300

Patent

active

043202543

ABSTRACT:
A volume control apparatus wherein a master volume control resistor is controlled by a motor and a control circuit is provided for the motor which includes a presettable-variable resistor and a slave-variable resistor which is driven by the output shaft of the motor. A first comparator is connected to the presettable-variable resistor and to the slave-variable resistor which are in turn connected across suitable supply voltages and depending upon the relative voltages across these resistors a motor control discriminator circuit operates the motor in either the clockwise or counterclockwise direction to vary the master volume control and the slave-variable resistor until the slave-variable resistor is substantially equal to the presettable-variable resistor. When the resistance of the slave-variable resistor approaches the presettable-variable resistor the output of the master volume control is connected to an output speaker by a relay circuit.

REFERENCES:
patent: 3444323 (1969-05-01), Nagashima et al.

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