G.R.A.S. has developed and manufactures a precision power modules to complement the capabilities of your microphones and pre-amplifiers:
 

Click on images for details:

Constant Current Power (CCP)
Type 12AL 1 chnl, low noise, 1Hz-200 kHz, switchable A-weigting, battery or external power supply	Type AG002 in-line adapter for a CCP pre-amplifier with a constant voltage power supply
Constant Voltage
Type 12AA 2 chnl, battery+ext. power, 7-pin Lemo 1B in BNC out, gain: -20 dB, 0 dB, +20 dB or +40 dB	Type 12AB - Intensity Power Module 2 chnl, battery+ext. power, for Sound Intensity Probe Type 50AI vers. B, C and D.	Type 12AD 1 chnl, battery+ext. power, 7-pin Lemo 1B in BNC output, with 200V or 0V polarisation
Type 12AG 8 chnl, mains power, 7-pin Lemo 1B/BNC out, linear+A-weighting+highpass, 200V/0V polaris.	Type 12AK 1 chnl, battery+ext. power, 7-pin Lemo 1B in BNC out, for Type 0 SLM, polaris.+gain+more	Type 12AN 4 chnl, battery+ext. power, 7-pin Lemo 1B in BNC output, with 200V or 0V polarisation
Type 12AP simultaneously powers preamp for condenser microphone + amplifier for loudspeaker	Type 12AR 2 chnl, battery+ext. power, 7-pin Lemo 1B in BNC output, with 200V or 0V polarisation
Low Noise Measurement
Type 12HF 1 channel, for use with matched low-noise preamplifiers and high-sensitivity microphones	Type 12HM 10 channels, for use with matched low-noise preamplifiers and high-sensitivity microphones, 200V/0V polaris.+gain+more
Constant Voltage and Constant Current Power (CCP)
Type 12AQ 2 channel, manual or remote control, for general acoustic measurements as well as intensity measurements; both in the laboratory and in the field each chnl independent: gain, filter, input, output and polarisation voltage.

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Other G.R.A.S. Sound and Vibration products

• Microphones
• Preamplifiers
• TEDS Microphones
• Intensity microphones and calibrators
• Intensity Probes
• Pistonphones and Calibration equipment
• Telephone test head
• KEMAR Manikins - Types 45BM and 45BA
• Artificial ears, ear & mouth simulators
• Accessories
• Handset Positioning System - Type 45EA