| 摘要 |
PURPOSE:To decrease the power consumption by driving intermittently a switching circuit while the circuit contact conducts. CONSTITUTION:A sequencer 1 is connected to an input circuit 2 via a photocoupler 3. The sequencer 1 contains a processing circuit 4 including a microcomputer which controls the external equipment. A power supply 17 is connected in series to an external contact 5 which is varied with control of the external equipment. The power of the supply 17 is applied to an LED9 contained in the photocoupler 3 via the contact 5, a current limiting resistance 7 and a display LED8. The light of the LED9 is received by a phototransistor TR10, and the output of the TR10 is supplied to the circuit 4 via a circuit consisting of resistances 13 and 14 and a capacitor 15. Thus the external equipment is controlled. |
