Single switch multi-light control circuit (2)

Figure 296 Only one power switch S can control the on and off of three groups of light bulbs El, E2 and E3. E is suitable for controlling
large chandeliers in living rooms . When s is disconnected, the lamp is fully on; when s is closed for the first time, only E1 is on; when S is disconnected, LS can be closed for a short time, El and E2 are on; when LS is closed again, F1 and F3 are on. On; open the fork again and close f S. El-E3 all lights up.   R. , G, v D1, vs and c1 form a simple capacitor step-down half-wave rectifier and voltage stabilizing circuit. (. is an energy storage capacitor. When s is cut off, UM013 can reliably trigger counting without power interruption within a certain period of time. VD2 is an isolation diode, which allows small charges to be discharged to the forward stage . (, D4 013 is Double D flip-flop, which forms a counter . Since R,, (1, the charge and discharge time constant is very small, S disconnects the cross I pin once , R: The upper end outputs a counting positive pulse and sends it to @ pin cI1 terminal counting, so that the Ql and Q2 terminals output high level. Press: OO bl0_01_11_00_--timing change. When both Ql and Q2 output low level, that is, "00" , only E1 lights up, and E2 and E3 light up slightly; when the output "1 0" ef, the thyristor VTH1 is turned on, so El and E2 are lit {when "01" is output, VTH2 is turned on, F1 and E3 are lit; when "ll" is output, VTHl and VTH2 are not connected, and the group light All lit up.     "The CI3H-4()OV type polypropylene IU container collapsed. The VTH1 and VTH2 ports J collapsed the MAC94A4 type small plastic-encapsulated bidirectional thyristor. Other component parameters are shown in the figure, and there are no special requirements.