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555 vision care mndatory rest 10 minutes power supply socket

2017-01-16 08:57  
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555 vision care mndatory rest 10 minutes power supply socket circuit
This power supply socket circuit is composed of the step-down rectifier circuit, the voltage-stabilizing circuit, the ultra-low frequency oscillator and the SCR control circuit.etc, as the figure 16-33 shows. The step-down rectifier circuit outputs the +6V stable voltage. The ultra-low frequency astable multivibrator is composed of the IC2(555) and the R2,RP1,R3,C3. When you close the power supply switch SA, C3's charging voltage can not be mutated, so pin-2 has the low electric potential at the beginning to make the 555 in the setting state, and pin-3 outputs the high electric potential, the SCR conducts, the socket CZ gets the power to turn on the electrical equipments or lights.