| 摘要 |
A selector switch is operable to apply one of a plurality of input signals to a high impedance AC amplifier through a coupling network. A switching means is coupled to the selector switch for alternately and concurrently discharging one and charging a second charge storage means for each operation of the selector switch. The storage means being charged generates a charging signal of a predetermined duration which controls a switching device through a gating means. The switching device is operative in response to the gated charging signal and during the continuance thereof, to connect a relatively low impedance path across the input of the AC amplifier whereby to substantially reduce the response time of the AC amplifier.
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