The circuit diagram of the components used: 555 3DG6 as shown in the figure as high performance Street lamp control circuit of photoelectric. Comparison of the circuit by the LDR photoelectric conversion element, circuit (IC1), single IC2 stability circuits and other components.
IC2 and BG1, BG2 and posed "action locking" circuit, LDR components using photosensitive resistor. When LDR is when lighting, their resistance is low, 555 ② input low level and the setting of the foot, ③ foot high output level, so relay j not action, light emitting diode LED1 shine. At night, LDR is because the light was not affected by high resistance, 555 ② input high level and the reduction of the foot, ③ feet low output level, so that the relay j snap, led LED1 shine. Work is also triggered IC2, make it output timing of td=1.1R7C6 (about 10 minutes) of the signal, the appropriate light-emitting diode LED2 light. Within l0 minutes, can solve the relays in "critical points" instability problems. Circuit in the "action locking" circuit can also overcome the relay in critical action points due to shortcomings of light unstable changes frequently. So this circuit on the street lamps of high performance optical control.