US3686511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker protective circuit
Assignee: Stanton Magnetics Inc
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Filing: 1971-04-16
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Granted: 1972-08-22
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Expires: 1991-04-16
Abstract
Abstract A speaker protective circuit is provided designed to be interposed between the speaker transducer and driving signal source. The protective circuit includes a silicon controlled rectifier shunted across the transducer adapted to fire in response to either repetitious, intermittent power surges or continuous high level surges and a circuit breaker in series connection with the driving signal source adapted to open circuit in response to long duration power surges or a series of closely spaced short duration surges.
Inventors
- 👤 Walter W Pauly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:17
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/041; H04; H04R; H04R3/00; H04R3/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A speaker protective circuit interposed between a speaker driving device and a speaker transducer element, said protective circuit being adapted to prevent audio signals from said driving device above a predetermined cumulative level from passing to said transducer element, said circuit comprising: fuse means connected in series with said driving device; a silicon controlled rectifier shunted across said speaker transducer element; a first resistor and a diode series connected to a second resistor connected in parallel with said driving device and said speaker transducer element, said diode having an anode connected to said first resistor and a cathode connected to said second resistor, the value of said resistors being such that the potential at the junction of said second resistor and said diode cathode is sufficient to gate said silicon controlled rectifier when the output level from said driving device reaches said predetermined level; connecting means extending between the gate terminal of said silicon controlled rectifier and said junction; and, a capacitor shunted across said second resistor whereby to maintain the potential at said junction for a predetermined time period.
Claim 2
Dependent Claim
180 words
A speaker protective circuit interposed between a speaker driving device and a speaker transducer element, said protective circuit being adapted to prevent audio signals from said driving device above a predetermined cumulative level from passing to said transducer element, said circuit comprising: fuse means connected in series with said driving device; a silicon controlled rectifier shunted across said speaker transducer element; a first resistor and a diode series connected to a second resistor connected in parallel with said driving device and said speaker transducer element, said diode having an anode connected to said first resistor and a cathode connected to said second resistor, the value of said resistors being such that the potential at the junction of said second resistor and said diode cathode is sufficient to gate said silicon controlled rectifier when the output level from said driving device reaches said predetermined level; connecting means extending between the gate terminal of said silicon controlled rectifier and said junction; and, a capacitor shunted across said second resistor whereby to maintain the potential at said junction for a predetermined time period.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |