Use CD4069 and CD4017 to make a novel light flashing controller

The circuit of the novel lantern flashing controller is shown in Figure 3-30. vs and VD7~VDIO constitute the main loop of the controller.
The control loop mainly consists of six inverters CD4069 and decimal counting/distributor CD4017 digital integrated circuits and a small number of discrete
Component composition. VD6, R7 and CI form a simple resistor step-down voltage stabilizing circuit to output IZV DC power for the control loop
.
    Inverters I and II form a simple astable multivibrator. Its oscillation frequency is mainly determined by (RP+R1) and
the time The output terminal of inverter II is the square pulse signal output by pin 4. It is sent to the CP terminal of A2, namely J4 pin, for counting.
A2 has 10 decoding output terminals QO~Q9. This controller only uses the four output terminals QlVQ4. When A2 is in reset
state, only Qo outputs high level, and the other output terminals are low level. When the CP terminal of A2 inputs a counting pulse
, Qo becomes low level. Ql is high level: CP terminal inputs another counting pulse, Ql becomes low level, Q2 is high
level; CP terminal inputs another pulse. Q2 becomes low level, Q3 is high level... When Q4 appears high level, this
high level is added to the reset terminal, i.e. pin 15, through VD4, A2 is reset, Qo is high level, and the other output terminals are Return to low
level. It can be seen from the above analysis. When the CP terminal of A2 continuously inputs counting pulses, its output terminals QO~Q3 will cycle to
high level. The cycle speed depends on the frequency of input pulses at the CP end. Adjusting the potentiometer RP can change the QO^-Q3 commercial
level cycle rate.
    When Qo is high level, because the input terminal of inverter III, namely pin 13, is low level, and the output of pin 10 is still
low level after two inversions, the thyristor vs gate has no trigger voltage and is turned off. status, so the lantern chain H does not light up. When Ql is high level
, this high level charges C4 through VD1 and R3. The voltage at both ends of C4 is added to the input end of the inverter in, i.e.
pin 13 of Al, through R6. When the voltage at both ends of C4 rises to the CMOS gate When the threshold level of the circuit is at a low level, the inverter in outputs a low level, and then
inverts the inverter IV to output a high level and adds it to the gate of vs through R8. vs is turned on because it obtains the forward trigger voltage, and the lantern H
emits light when energized. When vs is turned on, the negative electrode of VD5 is grounded, so VD5 is turned on. At this time, the charge on C4 will
be discharged through VD5 and vs, causing the level of Al's 13 pin to drop. When it drops below the threshold level of the CMOS gate circuit, Al's IO pin
suddenly changes to low level, and vs loses the trigger voltage. , it will turn off when the AC current crosses zero. At this time, the reverse bias of VD5 is cut off, and the high level output by Q1
can be charged to C4 through VDI and R3. When the voltage at both ends of C4 reaches the threshold level again, the inverter
III and Iv are inverted twice to make vs Open. Therefore, in the half cycle of AC power, C4 has a charging and discharging
process. When C4 is charging, + vs is off; when C4 is discharging, vs is on. The shorter the charging time of C4,
the longer the conduction time of VS in the half cycle, that is, the larger the conduction angle, the higher the voltage across the lamp H, and the brighter the lamp. When Ql is high level,
the charging resistance of C4 is R3 (lOOk Q). The charging resistance is small, and the voltage across C4 reaches the threshold level earlier, so the brightness of the colored light
is maximum: when Q2 is high level, the charging resistance is slightly larger, R4 (180k Q), so the vs conduction angle is small. The brightness of the colored lamp is slightly darker;
when Q3 is at a high level, the charging resistance of C4 is larger than R5 (220k n), the vs conduction angle is the smallest, and the brightness of the colored lamp is at its lowest:
when Qo is at a high level, the vs is turned off and the colored lamp goes out. Therefore, the colored lights can cycle through the brightest, slightly brighter, dimmed and extinguished modes.