Electronic switch

Claim 2

A switching circuit for controlling the flow of current between a source and one of two loads in response to the condition of a single-pole single-throw switch, said circuit comprising: a. transistor means connected between said source and one of said two loads for applying current thereto when biased to the conductive state, b. resistor means connected between said source and the other of said two loads for applying current thereto when said transistor is biased to the nonconductiVe state, and c. means including said single-pole single-throw switch and a semiconductor diode, for biasing said transistor conductive or nonconductive in response to the condition of said switch.

Claim 3

The circuit of claim 1 wherein said two loads comprise the AM and FM sections of a radio broadcast receiver, and said switch comprises the receiver FM-AM function switch.

Claim 4

A switching circuit for selectively controlling the supply of electric power between a power source having two terminals and one of two loads in response to the opening and closing of a single-pole single-throw switch, each of said two loads having two terminals, one of which is connected in common with one of said two power source terminals, said circuit comprising: a. a transistor having its emitter-collector circuit connected between the other terminal of said source and the other terminal of one of said loads for supplying current to said one load when said transistor is biased to the conductive state, b. means including said switch and a bias resistor, connected between the base of said transistor and said common terminal of said loads for selectively placing said transistor in either its conductive or non conductive state, and c. circuit means, including a second bias resistor, an associated semiconductor diode, and said switch, connected between said other terminal of said source and the other terminal of the other of said loads for supplying current to the other of said loads when said transistor is biased to its non-conductive state.

Claim 5

A switching circuit for selectively controlling the supply of electric power between a power source having two terminals and one of two loads in response to the opening and closing of a single-pole single-throw switch, each of said two loads having two terminals, one of which is connected in common with one of said two power source terminals, said circuit comprising: a. a transistor having its emitter-collector circuit connected between the other terminal of said source and the other terminal of one of said loads for supplying current to said one load when said transistor is biased to the conductive state, b. means including said switch and a bias resistor, connected between the base of said transistor and said common terminal of said loads for selectively placing said transistor in either its conductive or non conductive state, and c. circuit means, including a second bias resistor, an associated semiconductor diode, and said switch, connected between said other terminal of said source and the other terminal of the other of said loads for supplying current to the other of said loads when said transistor is biased to its non-conductive state.

Claim 6

A switching circuit for controlling the flow of current between a source and one of two loads in response to the condition of a single-pole single-throw switch, said circuit comprising: a. a first transistor connected between said source and one of said two loads for applying current thereto when biased to the conductive state; b. means including said single-pole single-throw switch and a first bias resistor for biasing said first transistor conductive or non-conductive in response to the condition of said switch, c. a second transistor, of a type complementary to said first transistor, connected between said source and the other of said two loads, and d. circuit means including a second bias resistor and said switch for rendering said second transistor conductive when said transistor is non-conductive to apply current to the other of said two loads.

Claim 7

A switching circuit for controlling the flow of current between a source and one of two loads in response to the condition of a single-pole single-throw switch, said circuit comprising: a. a first transistor connected between said source and one of said two loads for applying current thereto when biased to the conductive state; b. means including said single-pole single-throw switch and a first bias resistor for biasing said first transistor conductive or non-conductive in response to the condition of said switch, c. a second transistor, of a type complementary to said first transistor, connected between said source and the other of said two loads, and d. circuit means including a second bias resistor and said switch for rendering said second transistor conductive when said transistor is non-conductive to apply current to the other of said two loads.

Claim 8

A switching circuit for selectively controlling the supply of electric power between a power source having two terminals and one of two loads in response to the opening and closing of a single-pole single-throw switch, each of said two loads having two terminals, one of which is connected in common with one of said two power source terminals, said circuit comprising: a. a transistor having its emitter-collector circuit connected between the other terminal of said source and the other terminal of one of said loads for supplying current to said one load when said transistor is biased to the conductive state, b. means, including said switch and a bias resistor connected between the base of said transistor and said common terminal of said loads for selectively placing said transistor in either its conductive or non-conductive state, and c. circuit means, including a second bias resistor and a second transistor, having a conductivity type complementary to said transistor, and said switch, connected between said other terminal of said source and the other terminal of the other of said loads for supplying current to the other of said loads when said transistor is biased to its non-conductive state.

Claim 9

A switching circuit for selectively controlling the supply of electric power between a power source having two terminals and one of two loads in response to the opening and closing of a single-pole single-throw switch, each of said two loads having two terminals, one of which is connected in common with one of said two power source terminals, said circuit comprising: a. a transistor having its emitter-collector circuit connected between the other terminal of said source and the other terminal of one of said loads for supplying current to said one load when said transistor is biased to the conductive state, b. means, including said switch and a bias resistor connected between the base of said transistor and said common terminal of said loads for selectively placing said transistor in either its conductive or non-conductive state, and c. circuit means, including a second bias resistor and a second transistor, having a conductivity type complementary to said transistor, and said switch, connected between said other terminal of said source and the other terminal of the other of said loads for supplying current to the other of said loads when said transistor is biased to its non-conductive state.