LED lamp is a piece of electroluminescent semiconductor material chip, cured with silver glue or white glue to the bracket, and then connected to the chip and circuit board with silver or gold wire, surrounded by epoxy resin seal, to protect the role of the internal core, and finally installed in the housing, so the LED lamp is good shock resistance.

Circuit commissioningFound in production. The actual state transition point of NE555 time base circuit, i.e. the reversal jump point of 1 / 3V (: C) and 2 / 3vcc state, does not strictly follow the theoretical value. 14.4V overcharge control can be realized by adjusting resistor R13.

Solar street light is composed of solar cell components, including bracket, LED lamp holder, control box, controller, battery and light pole.The luminous efficiency of solar panels reaches 127Wp/m2 and the power is high, which is very beneficial to the wind resistance planning of the system.

For search and selection of necessary staff, a variety of means from the arsenal of psychological science is used : biographical questionnaires, standardized and non-standartized interviews, jobs, modelling work and situational exercises, tests on achievement, personality, intelligence.