| 摘要 |
A cct. for protecting a depletion-type FET was comprised of detecting cct.(14) for detecting the load current of the amplifier cct. and normally-opened switching cct.(15) controlled by the output of the detecting cct. and supplying a part of the input signals to the load directly. The normally-opened switching cct. was closed if the load current increased a fixed value, so that the voltage between gate and source of the FET was fixed close to the pinch-off voltage, thus limiting drain current of the FET.
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