A current inductive timer socket comprises: a principle relay circuit
including an output relay and a voltage input terminal, a reed relay
circuit including a capacitor, a plurality of diodes, a reed relay and a
resistance, a counter circuit including a DC rectifier, seven
series-connected counters, and a time select switch, a holding circuit
including a neon light, a photodiode, an operational amplifier, a
transistor, a diode and a resistance, a time switch circuit including
three time switches, and three series-connected exciting transistors, and
an inductive and amplification circuit including a transformer
parallel-connected to a rated resistor, a set of two-stage operational
amplifiers, a resistance, and a capacitor. When the electric appliance is
in use, a signal of voltage drop produced at both ends of the rated
resistor will be amplified by the operational amplifier and then
transmitted to the counter circuit, making the counter circuit start to
count automatically, and thus time operation is carried out.