Assessments - 3, GPA: 3 ( )

Fabricante : Ashly Arquivo Tamanho: 108.27 kb Arquivo Nome : Língua de Ensino:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8.3 Two-Way Crossover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8.4 Mic-Line Mixer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier 9 TYPICAL APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9.1 Stereo Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9.2 Parallel Mono Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9.3 Bridged Mono Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 10 DESIGN THEORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 11 TROUBLESHOOTING TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 11.1 No Audio Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 11.2 Distorted Sound. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 11.3 Hum or Buzz Noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 12 DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 13 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 14 WARRANTY POLICY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 15 SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Caution: This power amplifier can produce dangerous output voltage levels, high power levels, and high sound pressure levels in loudspeakers. In order to minimize the risk of injury, damage, or hearing loss, please read the entire owner's manual before connecting to a sound system. WARNING: THIS APPARATUS MUST BE EARTHED Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier 1. INTRODUCTION The Ashly FTX Series III MOSFET amplifiers combine the sonic excellence of a high-end stereo amp with the ruggedness and stamina necessary in pro audio. The FTX Series III amps use lateral power MOSFETs (metal-oxide-semiconductor, field-effect transistors) for their superior audio fidelity and unmatched reliability as proven in Ashly amps for over fifteen years. These MOSFET output devices exhibit many superior performance characteristics over the conventional bipolar power transistors used in most conventional power amp designs. They are inherently self-regulating and do not exhibit many of the failure modes of bipolar transistors. MOSFETS have no thermal runaway tendency so the need for temperature tracking bias circuitry is eliminated, making the design simpler and more reliable. MOSFETS do not suffer from secondary breakdown (the primary failure mechanism in in bipolar transistors which requires complex dissipation limiting to avoid.) The MOSFET will even withstand a shorted load and self-limit the resulting high drain current without any protection circuitry for a short time. MOSFETS do not have a “minority carrier storage time” (a phenomenon found in bipolar transistors in which a certain amount of time is required to turn the transistor off). Therefore the MOSFET is said to be a “fast” device which can function very accurately and efficiently with high amplitude/high frequency signals and transient waveforms. The FTX series III amplifiers are the result of years of refinement to the original Ashly MOSFET design. The current circuit is cleaner, quieter, and more stable than ever before. A number of improvements have been made in the area of thermal management using new insulating materials and increased heatsink area, allowing even more robust performance into difficult loads. Protective systems have been refined to add even more insurance against gross faults such as short circuits and the application of speaker damaging signals to the amplifier. The module assembly is produced using assembly techniques including individual testing of each component before it is placed on the PC board, and a state-ofthe- art soldering system which insures excellent strength and ruggedness. The FTX series III uses the latest generation of lateral MOSFETS. These components also improve on a time honored design. The result is higher bandwidth, improved power handling, and better matching. The all- metal case of these transistors results in a ruggedness not possible with plastic designs. The unmatched reliability of the power MOSFET output devices, the clever mechanical design, and the careful assembly techniques of the FTX Series III amplifiers ensure years of maintenance-fr...

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