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United States of America
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Issued Date -
Feb 6, 2020
app pub date -
Jul 30, 2019
filing date -
Jul 30, 2019
priority date (Note) -
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Abstract
A system 1 for controlling a plurality of irrigation valves 21, 22 . . . 2n is shown. The system receives 110 or 240 volts, mains voltage, electricity from the mains. This is applied to a 28 volt square wave generator 3, whose output is modulated in a modulator 4 under control of a control circuit 5. The modulated output is applied to a live line 6, receiving modulated positive and negative pulses of 28 volts with respect to a neutral line 7.
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