Five-way flashing light string circuit (4)

This example introduces a hundred-channel flashing controller composed of digital integrated circuits. Its flashing method is novel
and unique, and can be used for hanging tree decorations and other occasions. The circuit is shown in Table 265 (a) The circuit is mainly composed of time base circuit,
JK flip-flop digital integrated circuit and IC solid state relay.
    When the benzene circuit Al (IF5 5S) forms an ultra-low frequency self-excited multivibrator, its oscillation frequency can be adjusted by RP
. After the circuit starts oscillating, its ③ pin outputs a square clock pulse. When the clock pulse is low ,
the built-in light emitting tube of solid state relay SSR1 emits light. When SSR1 is turned on, the first colored light El lights up; when the output is high level,
SSItl is turned off and E1 goes out. This clock pulse is directly added to
the C and Pl terminals of a jK flip-flop of JK flip-flop A2 (CD4027) as a trigger signal. Since the J terminal and the K terminal of the jK flip-flop (i.e., the ⑥ and ⑤
pins) are connected together, the level is V... Every time the CP terminal receives a clock pulse, the flip-flop state will
flip by one to enter. The counting state becomes a T flip-flop counting flip-flop. ¨The two output terminals ① and ②
are always high-level "1" a and f, and the other is low-level "O". Their electrical relationship with the CP terminal is shown in Figure
265(h). It can be seen from the figure that the pulse frequency of the output terminal is 1/2 of the input pulse, that is, one frequency division is achieved. The other JK flip-flop of A2
also adopts the same connection method, and also connects the J terminal and the K terminal (i.e., the ⑩ and ⑩ pins) together to
the high level V. m. And send the Ql terminal output pulse directly to its input terminal CP2, and divide the frequency by one, that is, @,
⑩ The output pulse frequency of the two pins is the clock frequency of the ③ pin of A1], {.
    From the above analysis, we know that the ① and ② pins of A2 will alternately output high level and low lU. F, when a certain pin outputs island
level, the transistor VT1 (or V1_2) connected to it is turned on, the homomorphic relay SSR2 (or
SSR3) controlled by it is turned on, the colored lamp F.2 (or E3) lights up, and The lighting time is twice as long as Fl. In the same way,
the ⑩ and ⑥ pins of ^2 also output high level and low level alternately. When a certain pin outputs high level , the triode VT3 (or VT4) connected to it
is connected, and it controls the same When the status relay SSR4 (or SSRj) is turned on, Caican E4
(or F.5) lights up and the lighting time is 4 times of El. Therefore, arranging 5-way colored light strings on the Christmas tree
can create a novel and interesting flash decoration effect.
    SSR1-SSR5 adopts H1 type TAC018 type relay produced by Guangdong Zhongshan Dahua Electronics.
VT1-VT4 can use 901 type 3 silicon two-sill tube, and the required opening is ≥l00. The light string can be composed of small electric diodes of the same specifications connected in series
, or commercially available finished light strings. The power of each light string is small. chu exceeds iOOW. T uses 220V: 6V,
5VA small high-quality power transformer, which requires long-term power supply without generating heat.