US3633195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Record level indicator circuit
Assignee: 3M Co
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Filing: 1969-11-06
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Granted: 1972-01-04
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Expires: 1989-11-06
Abstract
Abstract An incandescent indicator lamp is connected in series with an SCR across an AC electrical power source. The gate terminal of the SCR is coupled through a voltage dividing network to a lead which is connected to a recording amplifier for monitoring a communication signal. The voltage dividing network is set to cause the SCR to be triggered for enabling conduction, thereby enabling current flow therethrough to light the indicator lamp, whenever the amplitude of the monitored communication signal is of at least a predetermined record level.
Inventors
- 👤 David C Menzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:54
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/36; H; H03; H03K; H03K17/00; H03K17/18; H03K17/51; H03K17/56; H03K17/72; H03K17/725
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
262 words
A record level indicator circuit of the type wherein an incandescent lamp glows when the amplitude of a monitored communication signal from a recording amplifier is of at least A predetermined threshold voltage level, comprising an incandescent lamp which operates in an on-state and thereby glows when current flows therethrough; means for monitoring a communication signal from a recording amplifier; a solid state switching means connected in series with the incandescent lamp for enabling conduction through the incandescent lamp upon the solid state switching means being triggered into conduction, and for inhibiting conduction through the incandescent lamp upon the solid state switching means being rendered nonconductive, wherein the solid state switching means includes gate means which are operatively coupled to the monitoring means for sensing a said monitored communication signal and for triggering the solid state switching means for enabling said conduction upon detecting that the amplitude of a said monitored communication signal is of at least a said predetermined threshold voltage level, wherein the solid state switching means has a DC gate trigger voltage in the range of the amplitude of a said monitored communication signal; a voltage dividing network operatively coupled between the monitoring means and the solid state switching means, wherein the voltage dividing network is set to provide to the solid state switching means at least the DC gate trigger voltage thereof, when the amplitude of a said monitored communication signal is of at least a said predetermined threshold voltage level; and means for providing AC electrical power across the seriesconnected incandescent lamp and solid state switching means.
Claim 2
Dependent Claim
262 words
A record level indicator circuit of the type wherein an incandescent lamp glows when the amplitude of a monitored communication signal from a recording amplifier is of at least A predetermined threshold voltage level, comprising an incandescent lamp which operates in an on-state and thereby glows when current flows therethrough; means for monitoring a communication signal from a recording amplifier; a solid state switching means connected in series with the incandescent lamp for enabling conduction through the incandescent lamp upon the solid state switching means being triggered into conduction, and for inhibiting conduction through the incandescent lamp upon the solid state switching means being rendered nonconductive, wherein the solid state switching means includes gate means which are operatively coupled to the monitoring means for sensing a said monitored communication signal and for triggering the solid state switching means for enabling said conduction upon detecting that the amplitude of a said monitored communication signal is of at least a said predetermined threshold voltage level, wherein the solid state switching means has a DC gate trigger voltage in the range of the amplitude of a said monitored communication signal; a voltage dividing network operatively coupled between the monitoring means and the solid state switching means, wherein the voltage dividing network is set to provide to the solid state switching means at least the DC gate trigger voltage thereof, when the amplitude of a said monitored communication signal is of at least a said predetermined threshold voltage level; and means for providing AC electrical power across the seriesconnected incandescent lamp and solid state switching means.
Claim 3
Dependent Claim
40 words
A signal level indicator circuit according to claim 1, wherein the solid state switching means comprises an SCR having its gate terminal operatively coupled to the monitoring means and its cathode and anode terminals in series with the indicating means.
Claim 4
Dependent Claim
497 words
A record level indicator circuit of the type wherein a first incandescent lamp glows when the amplitude of a monitored communication signal from a recording amplifier is of at least a predetermined record level, and a second incandescent lamp glows when the amplitude of a said monitored communication signal from said recording amplifier is of at least a predetermined level corresponding to a predetermined recorded distortion percentage, comprising means for monitoring a communication signal from a recording amplifier; first and second incandescent lamps; a first solid state switching means connected in series with a first incandescent lamp for enabling conduction through the first incandescent lamp upon the first solid state switching means being triggered into conduction, and for inhibiting conduction through the first incandescent lamp upon the first solid state switching means being rendered nonconductive, wherein the first solid state switching means includes gate means which are operatively coupled to the monitoring means for sensing a said monitored communication signal and for triggering the first solid state switching means into conduction upon detecting that the amplitude of a said monitored communication signal is of at least a said predetermined record level, wherein the first solid state switching means has a DC gate trigger voltage in the range of the amplitude of a said monitored communication signal; a first voltage dividing network operatively coupled between the monitoring means and the first solid state switching means, wherein the voltage dividing network is set to provide to the first solid state switching means at least the DC gate trigger voltage thereof, when the amplitude of a said monitored signal is of at least said predetermined record level; a second solid state switching means connected in series with the second incandescent lamp for enabling conduction through the second incandescent lamp upon the second solid state switching means being triggered into conduction, and for inhibiting conduction through the second incandescent lamp upon the second solid state switching means being renderEd non conductive, wherein the second solid state switching means includes gate means which are operatively coupled to the monitoring means for sensing a said monitored communication signal and for triggering the second solid state switching means into conduction upon detecting that the amplitude of a said monitored communication signal is of at least a said predetermined level corresponding to a predetermined recorded distortion percentage, wherein the second solid state switching means has a DC gate trigger voltage in the range of the amplitude of a said monitored communication signal; a second voltage dividing network operatively coupled between the monitoring means and the second solid state switching means, wherein the voltage dividing network is set to provide to the second solid state switching means at least the DC gate trigger voltage thereof, when the amplitude of a said monitored signal is of at least said predetermined level corresponding to a predetermined recorded distortion percentage, and means for providing AC electrical power across each combination of series-connected incandescent lamps and solid state switching means.
Claim 5
Dependent Claim
497 words
A record level indicator circuit of the type wherein a first incandescent lamp glows when the amplitude of a monitored communication signal from a recording amplifier is of at least a predetermined record level, and a second incandescent lamp glows when the amplitude of a said monitored communication signal from said recording amplifier is of at least a predetermined level corresponding to a predetermined recorded distortion percentage, comprising means for monitoring a communication signal from a recording amplifier; first and second incandescent lamps; a first solid state switching means connected in series with a first incandescent lamp for enabling conduction through the first incandescent lamp upon the first solid state switching means being triggered into conduction, and for inhibiting conduction through the first incandescent lamp upon the first solid state switching means being rendered nonconductive, wherein the first solid state switching means includes gate means which are operatively coupled to the monitoring means for sensing a said monitored communication signal and for triggering the first solid state switching means into conduction upon detecting that the amplitude of a said monitored communication signal is of at least a said predetermined record level, wherein the first solid state switching means has a DC gate trigger voltage in the range of the amplitude of a said monitored communication signal; a first voltage dividing network operatively coupled between the monitoring means and the first solid state switching means, wherein the voltage dividing network is set to provide to the first solid state switching means at least the DC gate trigger voltage thereof, when the amplitude of a said monitored signal is of at least said predetermined record level; a second solid state switching means connected in series with the second incandescent lamp for enabling conduction through the second incandescent lamp upon the second solid state switching means being triggered into conduction, and for inhibiting conduction through the second incandescent lamp upon the second solid state switching means being renderEd non conductive, wherein the second solid state switching means includes gate means which are operatively coupled to the monitoring means for sensing a said monitored communication signal and for triggering the second solid state switching means into conduction upon detecting that the amplitude of a said monitored communication signal is of at least a said predetermined level corresponding to a predetermined recorded distortion percentage, wherein the second solid state switching means has a DC gate trigger voltage in the range of the amplitude of a said monitored communication signal; a second voltage dividing network operatively coupled between the monitoring means and the second solid state switching means, wherein the voltage dividing network is set to provide to the second solid state switching means at least the DC gate trigger voltage thereof, when the amplitude of a said monitored signal is of at least said predetermined level corresponding to a predetermined recorded distortion percentage, and means for providing AC electrical power across each combination of series-connected incandescent lamps and solid state switching means.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |