Model 247 Audio Mixing Amplifier | DC-biased Microphone Compatible

Features

This Model 247 includes bi-polar output capacitors for compatibility with DC biased microphone inputs to other equipment.

• Bi-polar output capacitors for compatibility with DC biased loads
• Adjustable inputs accept microphone signals, headphone audio signals, or receiver audio signals
• Contains 3 electrically independent audio mixing circuits
• 4 input channels and 1 output channel per circuit
• Capable of driving a headset
• TSO-C50c, RTCA/DO-214, RTCA/DO-160C approved

Specifications

Weight:
0.6 kg (0.42 lb)

Dimensions:
41.40 x 76.96 x 76.96 mm (1.63 x 3.03 x 3.03 in)

Power Supply:
28 VDC @ 150mA, maximum (each circuit)

Input Impedance:
600Ω, (15KΩ with gnd/bias jumper removed)

Output Impedance:
100Ω

Frequency Response:
flat within ±3dB from 300 to 6,000 Hz

Distortion:
<1% THD+N

Gain Range:
>12dB

Output:
4.5 Vrms (33mW) into 600Ω, current limited outputs

Mic Bias:
18 VDC @ 30mA, individually selectable

Enclosure:
conversion coated aluminum

Mounting:
bulkhead mount: four #8 screws

Temperature:
-55°C to 70°C

Altitude:
-15,000 to 70,000 ft

TSO-C50c, RTCA/DO-214, RTCA/DO-160C approved