Charging and discharging circuit

Details Charging and discharging circuit Charging and discharging circuit

H - Electricity

03

K

320/1

H03K 17/56 (2006.01) H03K 5/13 (2006.01) H03K 6/00 (2006.01)

Patent

CA 1082767

ABSTRACT A charging and discharging circuit is formed by a PNP tran- sistor which is turned on by current flow through an isolating diode and a base bias network only when the input potential becomes higher than the reference potential, thereby closing a first charging path through a first resistor and another isolating diode to a common capacitor; an NPN transistor which is turned on by current flow through an isolating diode and a base bias network only when the input potential becomes lower than the reference potential, thereby closing a second charging path through a second resistor and another isolating diode to the common capacitor; and a third resistor connected across the common capacitor to provide a discharge path. The "attack" time constants for inputs of positive and negative polarities are controlled by the first and second resistor values, respectively, and the "release" time constant is controlled by the third re- sistor value. The circuit has utility in controlling a voice- actuated microphone in a hands-free intercom circuit, for ex- ample.

270958

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