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Features:
Features
The Larson Davis Model 2221 Microphone Power Supply
has the following features:
• Single Channel power and amplification for precision
microphone preamplifiers
• Internal batteries for portable operation
• 0 and 200 microphone bias voltages
• Selectable Flat (Z), A- and C-Weighting frequency
responses
• 0 to 50 dB gain range
• Last settings are saved even when not powered
• Both instantaneous and latched overload indications
• Output signal level indicating LED
• Internal battery voltage LEDs
• External power LED
• Ability to drive long input and output cables.
• Uses no power from internal or external batteries when
switched off.
• When powered by an external battery or DC voltage,
power will switch without interruption to the internal
batteries in the event of a power failure or when the
external DC voltage drops below the internal battery
voltage.