Four pattern lantern controller circuit

A lantern controller with automatic switching of four patterns. Its circuit is simple, easy to obtain materials, and does not require debugging. Even if you don't understand electronic technology, you can still make it successfully as long as you connect according to the diagram. The first pattern of the lantern controller is for the lantern to turn on and off, moving from left to right; the second pattern is for the lantern to turn on twice and then off, moving from left to right; and the third pattern is for the lantern to light up four times and move from left to right. off, moving from left to right; the fourth pattern is for lanterns 1 to 8 to light up one after another from left to right, and then extinguish one after another from left to right. The 4 patterns automatically change and cycle back and forth.

Circuit composition principle

The electrical schematic diagram of the lantern controller is shown in Figure 1. ICl and IC2 are connected by 555 to form a multivibrator. IC3 is connected to a hexadecimal counter by the 4-digit binary counter 74LS93, and its four output terminals can respectively output 2, 4, 8, and 16 frequency division signals of the counting pulses. IC4 is a double D flip-flop 74LS74, which is connected here to form a two-digit binary adding counter. IC5 is a dual 4-select 1 data selector 74LSl53, and only one set of its 4-select 1 data channels is used here. IC6 is

3-bit one-way shift register 74LSl64, which is the core device for generating moving light signals.

The drive circuit uses 8 transistors to form an 8-channel emitter follower for buffer amplification to trigger 8 triacs for current switches to control the lanterns.

glow.

The 5V power supply of the circuit is stepped down by a 220V/9V transformer, rectified by a D1-D4 bridge, and stabilized by 7805 to supply power to the control circuit.

How the circuit works

The pulse signal coming out from ICl ⑧ pin is divided into two channels: one is sent to the ⑩ pin of IC3 as a count pulse; the other is added to the ⑧ pin of IC6 as a shift clock pulse. Adjusting RWl to change the oscillation frequency of ICl can change the moving speed of the light to obtain different dynamic effects.

IC2, IC4, and IC5 together form an electronic switch. The counting pulse output by IC2 is counted by two-digit binary system of IC4, and a total of four logical states of "00" to "11" can be obtained at the two output terminals of IC4. These four states serve as the four data channel selection signals of IC5, corresponding to the four frequency division signals of QA, QB, QC, and QD transmitted from IC3 to IC5. Its function is equivalent to a controlled one-pole four-position mechanical switch. When the output of IC4 is "00", the ⑧ pin of IC5 is selected; when it is "01", the ⑤ pin of IC5 is selected... Adjusting RW2 to change the output pulse period of IC2 can change the switching time of the switch to select the length of time each pattern appears.

The data signal output from pin ⑦ of IC5 is sent to the input terminal of IC6. Under the action of clock pulse, the data moves sequentially from Q0 to Q7 on the 8-bit parallel output terminal of IC6. This moving 8-bit control signal drives 8 channels of lanterns through the power drive circuit, resulting in 8 channels of 4-pattern flowing water lanterns with automatic cycle switching.

Component selection

In Figure 1, the transformer uses a 220/9V, 10-20VA transformer. The transistor is 9013, the triac is 3A600V LC336A, and each channel can carry 20 220V15W incandescent bulbs.

The printed circuit is shown in Figure 2. In actual production, pay attention to the fact that the phase line (live line) and neutral line (neutral line) of AC 220V mains power must be strictly distinguished. The live wire cannot enter the controller. After the neutral wire enters the controller, it is connected to the ground of the triac.