OSCILLATOR OUTPUT CIRCUIT CONFIGURATION
First Claim
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1. An oscillator in circuit with a power supply and a primary winding of a transformer, and an output circuit connected across a secondary winding of said transformer;
- said output circuit comprising a gas discharge lamp connected across said secondary winding and in series with a pair of load terminals, a forward conducting rectifier means connected across said gas discharge lamp, and a reference voltage rectifier means reverse connected in circuit with the first-mentioned rectifier means and across said load terminals.
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Abstract
A circuit configuration and an electronic locator/stimulator device for medical purposes incorporating said circuit configuration in which a first pulse component of an output signal, which is clipped to a predetermined voltage amplitude, is impressed across load terminals of the circuit while a second pulse component of the output signal appears across a gas discharge indicator lamp.
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Citations
11 Claims
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1. An oscillator in circuit with a power supply and a primary winding of a transformer, and an output circuit connected across a secondary winding of said transformer;
- said output circuit comprising a gas discharge lamp connected across said secondary winding and in series with a pair of load terminals, a forward conducting rectifier means connected across said gas discharge lamp, and a reference voltage rectifier means reverse connected in circuit with the first-mentioned rectifier means and across said load terminals.
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2. In a circuit configuration comprising an oscillator in circuit with a powEr supply and a primary winding of a transformer, and an output circuit connected across a secondary winding of said transformer;
- said output circuit comprising a gas discharge lamp connected across said secondary winding and in series with a pair of load terminals, a forward conducting diode connected across said gas discharge lamp, and a zener diode reverse connected in circuit with the first-mentioned diode and across said load terminals, whereby a first pulse component of the output signal appears across said load terminals, the voltage level of the output pulse being limited by the breakdown voltage of the zener diode, and a second pulse component of the output signal appears across said gas discharge lamp.
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3. The circuit configuration as claimed in claim 2 including a second zener diode connected in series through a switching device with the first-mentioned zener diode whereby the output pulse voltage level is, with the switch open, a difference voltage between that of the first and second zener diodes.
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4. The circuit configuration as claimed in claim 2 including a linear voltage control potentiometer connected across said load terminals.
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5. The circuit configuration as claimed in claim 2 wherein the output pulse is clipped by the zener diode as an approximately square wave.
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6. A nerve locator/stimulator comprising a power supply, a transistorized oscillator circuit including at least one transistor in circuit with a resistance-capacitance timing network, the effect impedance of which is variable to provide a selected output pulse repetition rate, a transformer having at least one primary winding in circuit with said oscillator, and an output circuit from which an output pulse is obtained connected across a secondary winding of the transformer;
- said output circuit comprising a gas discharge lamp connected across said secondary winding and in series with a pair of load terminals, a forward conducting rectifier means connected across said gas discharge lamp, and a reference voltage rectifier means reverse connected in circuit with the first-mentioned rectifier means and across said load terminals.
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7. A nerve locator/stimulator comprising a power supply;
- an oscillator circuit including a single transistor in circuit with a resistance capacitance timing network, the effective impedance of which is variable to provide a selected output pulse repetition rate;
a transformer, said transformer having a first primary winding in circuit with the collector of the transistor and a second primary winding in circuit with the base of the transistor, and through which a reflected current is passed by way of a positive feedback loop to said transistor base; and
an output circuit from which an output pulse is obtained connected across a secondary winding of the transformer, said output circuit comprising a gas discharge lamp connected across said secondary winding an in series with a pair of load terminals, a forward conducting diode connected across said gas discharge lamp, and a zener diode reverse connected in circuit with the first-mentioned diode and across said load terminals, whereby a first pulse component of the output signal appears across said load terminals, the voltage level of the output pulse being limited by the breakdown voltage of the zener diode, and a second pulse component of the output signal appears across said gas discharge lamp.
- an oscillator circuit including a single transistor in circuit with a resistance capacitance timing network, the effective impedance of which is variable to provide a selected output pulse repetition rate;
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8. A nerve locator/stimulator as claimed in claim 7 wherein there is a second zener diode connected in series, through a switching device, with the first mentioned zener diode whereby the output pulse voltage level is selectable at two levels, said voltage level being, with the switch open, a difference voltage between that of the first and second zener diodes.
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9. A nerve locator/stimulator as claimed in claim 7 wherein there is a linear voltage control potentiometer connected across said load terminals.
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10. A nerve locator/stimulator as claimed in claim 7 wherein said output pulse is clipped by the zener diode as An approximately square wave.
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11. A nerve locator/stimulator as claimed in claim 7 wherein the impedance value of said timing network is variable by switching at least one capacitor component thereof into or out of circuit with the base-emitter electrodes of the transistor.
Specification