MA412AS Preamplifier
MA412AS is a
dedicated DC power supply preamplifier developed by BSWA, which is suitable for
MP series 1/4-inch pre-polarized microphones.
The main function of the preamplifier is
impedance change, since the output impedance of the microphone is above GΩ, it
cannot be directly connected to the common data acquisition equipment. The high
input impedance and low output impedance of the preamplifier can reduce the
output impedance of the microphone to less than 100 Ω.
MA412AS does not provide polarization voltage, so it is only applicable to pre-polarized microphones. It powered by single or dual DC power supply, with rugged stainless steel housing and mounting lugs for easy attachment to other equipment, making it suitable for harsh applications.
MA412AS is designed for direct cable output for user-definable cable length and output connector.
Features:
● Fit to
1/4-inch prepolarized microphone
● Powered by
single or dual power supply
● Frequency
response: 4 Hz ~ 50 kHz (±0.2 dB)
● Attenuation:
0.35 dB (typ.)
● Separated
power supply and signal lines
● Rugged
housing with fixed lugs
● Direct
cable output, user-defined output interface
Applications:
● Suitable
for harsh operating environment
技术参数：
| Applicable Microphone Diameter | 1/4" | |
|---|---|---|
| Polarization Voltage Support | 0V (Prepolarized) | |
| Frequency Response (Hz) (±0.2 dB) | 4 ~ 50 k | |
| Attenuation (dB) | 0.35 (typ.) | |
| Maximum Output Voltage (Vp) | ±10 | |
| Self-generated Noise | A-weighted | <4 μV (2.5 μV typ.) |
| 20 Hz ~ 20 kHz | <28 μV (8.8 μV typ.) | |
| Input Impedance (GΩ ǁ pF) | 15 ǁ 0.5 | |
| Output Impedance (Ω) | < 75 | |
| Power Supply | ±15 VDC | |
| DC Bias Voltage (V) | ≈1.5 | |
| Operating Temperature Range (°C) | -40 ~ 85 | |
| Operating Humidity Range (%RH) | 0 ~ 95 | |
| Dimensions (mm) | W46 x H13 x D26.6 (microphone thread not included) | |
| Mounting Thread for Microphone | 5.7 mm-60 UNS | |
| Output Connector | Direct cable output (coaxial x 2), user-definable output connector | |
| Weight (g) | 31.7 (without cable and connector) | |
| TEDS | 不支持 | |
|
Note: Unless specified otherwise, all values were measured at 23 °C, 101.3 kPa, 50 %RH by using 1 meters cable, ±15 V power supply and microphone capacitance of 15 pF. |
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Download information:
MA412AS Preamplifier Brief
