BMA-200 Single Channel AC/DC Preamplifier

• For all extracellular recording applications
• Battery or AC operation
• Low noise, wide gain range
• Built in audio amp and speaker
• True DC response with offset
• Rugged laboratory or field amplifier
• Stimulus passing to electrodes
• Isolation head-stage (ISO-Z) and high-impedance head-stage (HS-1) are available

• Input type and impedance: Differential instrumentation amp, > 10⁹ ohms
• Wideband noise, RTI: <7uV P-P 
• Common Mode Rejection: >95dB
• Gain range: 10X - 50,000X, 12-positions 
• Coupling: AC or DC, switchable
• Input connector: Amphenol 703-91T-3478-009 7-pin 
• Input offset adjustment ranges: +2mV, +20mV, +200mV, jumper selectable
• Voltages at input jack for external devices: +7.2V, 20mA max current
• AC calibrator: 1mV P-P square wave, approx. 10Hz
• Low-pass filter: 100Hz - 50kHz, 6-positions
• High-pass filter: DC - 300Hz, 6-positions
• Filter type, slope: Butterworth, flattest response, -12dB/octave
• Stim/record input: TTL negative logic, or switch closure
• Stimulus inputs (rear panel): 2mm (0.080”) pin jacks
• Audio amplifier: 200mW, built-in mylar speaker
• Audio output connector: 3.5mm stereo mini-phone jack
• Output connector (rear panel): BNC jack
• Operating time between charging: approx. 24 hours
• Power adapter/charger: 24VDC 
• Dimensions: 6W x 1.75H x 7D inches, 15 x 4.5 x 18 cm

Note 1: Not to be used for human life support applications.

The BMA-200 is a portable, battery operated amplifier for EEG, ECG, EMG, and other extracellular applications. The BMA-200 features a wide gain range, sharp cutoff bandpass filters, an AC calibrator, and a built-in audio amplifier and speaker for monitoring the signal. Stimulus delivery to the electrodes is accomplished by a front-panel switch, or via an external logic signal. True DC response is switch-selectable, with a variable DC offset control. Low-power circuitry contributes to long operating time between charges, or the unit can be operated with the included AC adapter. It features stable DC operation and includes adjustable DC offset.

A standard input cable is included which is compatible with a wide range of electrode lead-wires. Active head-stages are also available for microelectrode applications..