Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-02-23
1997-12-30
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
323355, G08B 1314
Patent
active
057035652
ABSTRACT:
A transmitter circuit drives a transmit antenna for an electronic article surveillance system with an alternating drive signal. The transmitter circuit includes a DC power supply which converts an AC input power signal into a DC power supply potential, a switching circuit which forms an alternating signal from the DC power supply potential, and a transformer which couples the alternating signal to the antenna. The transformer provides isolation for the transmit antenna, as well as voltage step-down to a desired amplitude for the antenna driving signal. The DC potential supplied to the switching circuit may be regulated or unregulated.
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P. Horowitz and W. Hill, "The Art of Electronics," Second Edition, pp. 360-361, 1989.
Mullen Thomas
Sensormatic Electronics Corporation
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