Single switch multi-light control circuit (3)

It is a multi-light circuit controlled by a single button SB. It selects a group or array of
light bulbs by pressing the number of times. There are 7 states to choose from. This circuit is suitable for controlling large chandeliers in the living room.
    In the figure, VD1,vs,G,G,R. With R, it forms a simple lu-capacitance step-down half-wave rectifier and voltage stabilizing circuit.
After power on, it can output a DC voltage of about I?V to power the entire circuit. CD1518 is a dual 2/10 system counter
. This circuit only uses one of the counters. Each time SB is pressed, that is, the M① pin inputs a positive pulse signal
, and its input terminals ⑥, ⑤, ④, and ③ will output according to the OO01-1000 timing sequence of = u: among them, ⑤, ④, and
③ pins pass R s ~R. . Trigger the thyristors VTH1, VTH2 and VTH3 respectively to control
the lighting of the three groups of bulbs Il - F3. Pin ⑦ is the reset terminal. When pin ⑥ outputs "卣" level, the circuit can be reset.
The outputs of pins ③, ④, ⑤, and ⑥ are all ".", and the E1~F3 lights are all off. In this way, except for the reset situation, the ⑧-bit binary has a total
of 7 combinations of 2J -1, that is, there are 7 combinations of the light bulb lighting state. R and c are the initial power-on reset network,
which ensures that when the circuit is powered off and then powered on, the circuit is in the reset light and all lights are off. R, R: and C can increase
the stability of the circuit
.     C, Yaochuan CRB-400V type polypropylene capacitor. VTHl-VTH3 can use MAC94A4 small
plastic-encapsulated bidirectional thyristor. 1,1-.E3 The maximum power of each group of bulbs should not exceed 15DW. Other component parameters are shown in the
figure, there are no special requirements.