Power Amplifier

The Bruel Kjaer 2706 has been designed to drive small vibration exciters, particularly the Bruel and Kjaer Vibration Exciter Type 4809. It can also be used to drive the Mini-Shaker Type 4810 to full rating. For this application, the maximum output current should be limited to 1.8A.

The power amplifier has a flat frequency response from 10Hz to 20 kHz (± 0.5dB). The power output capability is 75VA into a 3W exciter or resistive load and the maximum voltage gain is 40 dB. This enables the power amplifier to be used in acoustical measurement set-ups, even when third-octave narrow band noise is employed.

The use of a transformerless power output stage and high negative feedback results in very low harmonic distortion.
A balanced preamplifier and rugged solid-state design results in a stable instrument which can tolerate temperature fluctuations and supply line variations.