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800 VA power amplifier for low-frequency vibration exciters
The power amplifier type APS 145 has been designed to drive vibration exciters with 2.5 Ohm resistive load requiring up to 810 VA power with best performance. Harmonic distortion of the output is very small as heavy negative feedback is used. The device can tolerate temperature and supply line variations while maintaining excellent stability.
The APS 145 can be used as both a voltage generator with low output impedance or a current generator with high output impedance with a flat frequency response. The maximum output-current is adjustable by a current limiter in order to protect the exciter coil from an overload. Additionally, signals from an over-travel-switch or a temperature switch mounted at the vibration exciter, can be used to switch off the amplifier in an overload operation situation.
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