Bruel & Kjaer 2807 Two Channel Microphone Power Supply
The Bruel & Kjaer 2807 is a two-channel microphone power supply designed for use with condenser microphones. It provides the necessary voltage and current to operate the microphones, ensuring accurate and reliable sound measurements. Ideal for laboratory and field applications requiring high-quality audio capture.
- Model
- Bruel & Kjaer 2807
- Calibration
- Available on request
- Price
- $550
- Status
- In stock
- RFQ ref
- 2807
This unit
The Bruel & Kjaer 2807 is a dual-channel microphone power supply that delivers polarization voltage, preamplifier supply power, and impedance transformation for condenser microphone systems. It has stable 200 V DC polarization with ±0.5% regulation and multiple preamplifier supply outputs, enabling simultaneous multi-channel sound and vibration measurements in laboratory and field environments. Independent attenuation control per channel, external switching capability, and excellent cross-talk performance make it suitable for complex measurement setups requiring flexible signal routing.
Technical Specifications Polarization Voltage: 200 V DC, stabilized to better than 0.5% across ±10% mains variation. Preamplifier Supply Outputs: +150 V at 2 mA; +12.6 V anode at 100 mA; +6.3 V heater at 200 mA. Signal Path: 2 Hz to 200 kHz (±0.2 dB); extended to 200 kHz (±0.5 dB); flat within ±0.1 dB across 20 Hz to 20 kHz. Output: 28 V RMS (2 Hz to 20 kHz); maximum 8 mA RMS per channel; output impedance 13 Ω in series with 4.7 µF. Attenuation: Adjustable 0 dB to approximately −40 dB per channel via multi-turn potentiometer; insertion loss less than 0.15 dB (2 Hz to 200 kHz). Noise & Isolation: Inherent noise 80 dB to 20 kHz, > 60 dB at 200 kHz. Switching: External control socket for input selection; typical switching time 1 ms; chopper frequency approximately 0.5 Hz. Power Requirements: 100, 115, 127, 220, or 240 V AC (50–400 Hz) at ±10%; 10 VA consumption. Complies with IEC 348 safety class I. Outputs short-circuit protected.
Key Features
Two independent channels with separate signal level adjustment potentiometers
Input impedance 50 kΩ at microphone socket pin 4
Manual and automatic channel switching via external control socket
Standard B&K 7-pin microphone input sockets and output sockets
Compact modular construction (2/12 of 19" rack module)
Dimensions: 132.6 mm H × 69.5 mm W × 200 mm D; weight 2.2 kg
Compatibility & Integration Designed for Bruel & Kjaer preamplifier types 2615, 2618, 2619, 2627, 2633, 2639, 2645, and 2660. Fits B&K modular rack system for flexible laboratory and field deployment.
Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 2 Hz to 200 kHz | Voltage / Current Range: 200 V DC polarization |
Bruel & Kjaer 2807 — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Bruel & Kjaer 2807. All calibrations are performed to NIST-traceable standards and ship with a certificate. Turnaround is typically 1–3 business days after receipt.
Bruel & Kjaer 2807 price
This Bruel & Kjaer 2807 is listed at $550. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Bruel & Kjaer 2807 calibration cost
NIST-traceable calibration for the Bruel & Kjaer 2807 is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Turnaround is 1 to 3 business days after receipt. See full calibration details →
