Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1995-01-03
1996-07-02
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
363 26, 381120, H03F 2100, H02M 3335
Patent
active
055326498
ABSTRACT:
Pulse width modulating power supply circuitry is disclosed which manually or automatically controls the rail voltage setting of the amplifier circuitry. The maximum power rating of the amplifier will then be available to drive speakers with a pre-set impedance attached to the amplifier. A manual selection circuit provides a selector switch which places one or more resistors in parallel with a feedback resistor of a pulse width modulating controller which controls the setting of the rail voltages. In an automated mode the impedance of one of a set of speakers is measured at the time the amplifier is turned on and a resistor having a resistance appropriate to obtain maximum amplifier power output is placed in parallel with the feedback resistor in the pulse width modulating power supply controller by transformation circuitry. Light emitting diodes are wired into the resistor selection circuitry to provide an indication of circuit operation.
REFERENCES:
patent: 5216379 (1993-06-01), Hamley
patent: 5295058 (1994-03-01), McGreery
Biksa Janis
Mottola Steven
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