Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-03-28
1980-08-12
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
Specific condition
340653, 340659, G08B 2100
Patent
active
042175763
ABSTRACT:
Plural lamps are connected together at one end and in series with the primary winding of a transformer. The primary winding, responsive to application of an electric potential to one of the lamps, has a potential impressed there across and induces a transient in the secondary winding which generates a back E.M.F. in the secondary winding. A transistorized amplifier connected to the secondary winding amplifies the back E.M.F., and a monostable multi-vibrator has an input connected to the amplifier and is effective, responsive to the amplified back E.M.F., to effect generation of an illumination-received pulse at an output thereof. A J.K. flip-flop is connected to the multi-vibrator and is operable, responsive to receipt of the illumination-received pulse, to provide a "high" output signal indicating operability of the lamp and is operable, responsive to no signal at the output of the multi-vibrator, to provide a "low" output signal indicating inoperability of the lamp to prevent the current being applied to the lamp in the event the lamp is non-operative.
REFERENCES:
patent: 3421157 (1969-01-01), Atkins
patent: 3633196 (1972-01-01), Winkler
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