Five-way flashing light string circuit (3)

It is a chasing type five-hoof flashing light string controller made of Y9r 7A . Y977A is a product of Changzhou Sail Electronics
Co., Ltd. The chip is manufactured using CMUS process, standard D IP -8 package, and the power supply voltage range is
wide 2-7. 5V . This circuit can be used for decorative lighting in small karaoke halls, dance halls, shop fronts and homes.
    The characteristics of Y977A core H
are: after it is powered on, the corresponding MOSFET tubes
inside its five output terminals Ql-Q5 will be turned on in sequence, that is, the output terminals will output low level in sequence, and the output timing is: Ql-Q2 -...--Q5, Q4 one...QI. This low level passes through LED 1, ED1~I, ED5 and resistor R; -R respectively. To drive the thyristors VTH1-VTHJ to turn on and off, the colored lights on the roads E to F5 can flash in sequence, thus forming a chasing effect. (RP ~-Chi,) and (1, respectively, are the external oscillation resistor and capacitor of Y977A. The resistance can change the oscillation frequency of the internal oscillator of the manifold, so it can change the speed of the lantern chasing and shining. . LED1-I, ED5 are used for indication. Install them on the panel of the controller, and their flashing state is synchronized with the -r.     VD1, VD2, vs, BA and (. Waiting for Bao H to become simple The capacitor is a step-down half-transition rectifier to stabilize the E line. After power on, it will output a commercial current voltage of about Sv for the integrated block Y977A Sichuan Electric.     ', requires the use of Cllll-400, ' type polyene capacitors. VTHl-WIlHi Kezhou MAC9 1M and other small plastic-cut bidirectional thyristors have a maximum drive current of 1A. E1 ~ F5 ur use commercially available colored light strings, and the power of each string is required to be below 100W. If the light string power is large, it should be selected accordingly It is suitable for thyristors with large AIL current . The integrated block adopts Y077 type. Y97713 type can also be used. The tube pin arrangement of Y977B and Y977A is the same as the main electrical parameters and can be directly interconnected. But their output flash modes are different. Y977A is a chasing flash mode, while Y977B is a gradually brightening and gradually darkening cycle flash mode. The timing of the five output terminals Ql-Q:i of Y977B to output low level is Ql-QIQ2. Q]01Q-一...QIQ?Q3Q4Q5- QIQ2Q3Q4----Q1-O-Q1 (0 means fully off output state) That is, the output of the five groups of light-emitting tubes gradually increases to the h-channel output, and then gradually decreases Until it is completely off, it will light up again and again. Readers can choose according to their preference.