| 摘要 |
A circuit for the remote control of solenoid operated valves in an irrigation system reduces by one half the amount of wire required for the system. At least one pair of first and second solenoids are connected to a source of supply of alternating curent, typically through a low voltage circuit. A switching circuit selectively connects the source to the solenoids through a conductor having a diode network at either end of the conductor. One of the diode networks comprises a pair of diodes connected in anti-parallel relation across the switching circuit, and the other of said diode networks comprises a pair of oppositely poled diodes respectively connected between the conductor and a corresponding one of the solenoids. In operation, no current is supplied to the solenoids, current is supplied to the first solenoid on positive half cycles, current is supplied to the second solenoid on negative half cycles, or current is supplied simultaneously to both of said solenoids, depending on the operation of the switching circuit.
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