1. DA-275 Features Models Available Product Specifications
MODEL NUMBER
DA-275
HEADSET Amplifier
Features
▶ Rx-Volume controller
▶ Handset/Headset select switch
▶ Tone switch
▶ Stereo Signal volume controller
▶ Telephone compatible switch
▶ Stereo/Mono select switch
▶ Tx-Level controller
▶ Tx-Gain control switch
▶ Tx-Mute switch
▶ Power Saving Disable switch
▶ ALC – Automatic Level Control system
▶ Signal Sensing Auto ON Power system
▶ Recording Jack
▶ External DC Jack
Models Available
▶ DH-017T,DH-09T,DH-011T headsets
Product Specifications
Complete headset
Size • • • • • • • • W100 Ⅹ L120 Ⅹ H35m/m
Net weight • • • • • • • • 170g
Shipping weight • • • • • • • •
Operating and Storage Ranges
Operating voltage range • • • • • • • • 2V∼3V(2ⅩAA Battery)
Operating current range • • • • • • • • 2.5mA ∼3.5mA
Operating temperature • • • • • • • • 0℃ to 50 ℃
Storage temperature • • • • • • • • -40 ℃ to 65 ℃
Receiving Amplifier
ALC Action • • • • • • • • From –36dBV  2dB Input
Frequency range • • • • • • • • 150Hz ∼6KHz(-6dB)
Distortion • • • • • • • • Less than 3% at 1KHz
Total gain • • • • • • • • 26dB  2dB
Unclip output level • • • • • • • • 280mVRMS (150Ω Load)
Stereo Amplifier
Total Gain • • • • • • • • 0dB  3dB
Frequency range • • • • • • • • 30Hz ∼9KHz
Unclip output level • • • • • • • • 280mVRMS(300Ω Load)
Tone effect • • • • • • • • -6dB at 2KHz
Microphone Amplifier
Frequency range • • • • • • • • 250Hz ∼5KHz at –6dB
Distortion • • • • • • • • Less than 2.5% at 1KHz
Total Gain E/Mic • • • • • • • • 25dB  3dB
Total Gain C/Mic • • • • • • • • 35dB  3dB