Power Supply, 24V Linear, 3 Outlets, No Switching The PS300 is identical to the PS301 except that it does not have program audio facilities and is less expensive. The PS300 is a 3-circuit Power Supply with a unique hybrid configuration. Microprocessors operate all the switching, routing, and supervision functions, while the audio paths and the core power supply remain analog. The result is a station with unrivaled flexibility, muscular reliability, and clean, smooth audio. The PS300, as in all the 300 series master stations and power supplies, has a large toroidal transformer which gives off virtually no stray-field radiation to interfere with the other devices with which it shares rack space. Those power supply components which create heat are mounted on a massive heat sink, and, when neces- sary (rarely) get extra cooling from a thermally regulated cooling fan. Each of the 3 PS300 circuits is independent of the others, except for sharing the toroidal transformer and its peripherals. Therefore, a problem on one circuit does not affect the others. When a circuit problem occurs, and is eliminated, the PS300 resumes normal operation without re-booting. The monitoring and control functions include automatic adjustment of the termination impedance when the circuits are combined, adjusting to brown-outs or sudden drops in line voltage, monitoring the temperature of the heat sink and switching the cooling fan on when required, and reporting the status of each circuit to LED indicators on the front panel: The top, green LED reports that 24VDC is being delivered to the system. The lower 3 red LEDs flash when that circuit is experiencing an overload and stay on constantly when the circuit has been shorted and therefore shut down until the problem is solved. The microprocessor will also adjust the percentage of the 2.4A (continuous) current that is allocated to each circuit, depending upon the load on each. The transformer has primary windings for both 120VAC and 240VAC (50/60 Hz) and allows wide deviation from those voltages without any effect on performance. At as low as 100VAC, the secondary voltage will re- main at 24VDC while the available current will be slightly reduced from 2.4A continuous to 2.0A continuous. The voltage and fuse are changed on the rear panel. The components and microprocessor which monitor and adjust the power supply's performance are sepa- rately mounted on their own circuit board, as far as possible from any heat source. The PS300 can be used with any unbalanced 200W party-line intercom components. Specifications: Current draw (at 120VAC): 0.14A (no load), 1.05A @ 2.4A DC out Power output: 24 volts DC regulated @ 2.4A continuous Line termination: DC: 5KW; 50Hz-20KHz: 200W Size (excluding ears) : 17" width x 9.5" depth x 1.75" height (432 x 241 x 44.5 mm) Weight: 9.8lbs. 4.5Kg
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