that kind of lights are usually bright, colorful and changeable, and they are all "neon lights".
Neon lamp is a kind of cold cathode glow discharge tube, and its radiation spectrum has a strong ability to penetrate the atmosphere, and its color is bright and colorful.
Its line structure is expressive, and it can be processed and bent into any geometric shape to meet the design requirements. Through electronic program control, patterns and characters with changeable colors are welcomed by people.
control technology of neon lights
1. Multifunctional lantern controller is generally designed by sequential logic integrated circuit, using a four-D latch 74LS175. By setting a jumper with five choices, there are at most five control patterns to choose from. The circuit structure is simple, the cost is low, and it is stable and reliable. It is widely used in the control of running lights and happy lights. Another scheme adopts the design of special integrated circuit SH813 or SH815 for colored lights. On-chip synchronous zero-crossing detector, SH815 has as many as 16 kinds of control patterns, which can be selected and locked by a touch of a button, and has the effect of gradual dimming. Its simple design version is widely used in the control of various festive lantern strings.
2. The ordinary neon light program controller can realize complicated and diversified control of neon lights according to the predetermined program. The asynchronous binary frequency divider 4124 is used to obtain the synchronous signal of the power grid, and the asynchronous address generator 4141 is used to drive the program memory, and the previously customized lighting control program is sequentially taken out to drive the triode on the data port. This program controller is reliable in design, mature in technology, stable in performance, adopts synchronous zero-crossing trigger technology, reduces the pollution to the power grid, improves the reliability of silicon controlled rectifier, has no induction, little impact and is supported by a large number of scanning programs, so it is the most widely used product in the industry.
3. The super lantern controller is still a program controller in essence, but the circuit structure and its application scope are somewhat different. There is no synchronization and zero-crossing detection circuit, so it is suitable for independent use by a single machine. Using 4161 as the address generator to drive the memory, the whole memory space is evenly divided into 32 program segments, and various colorful programs are built in. You can choose any segment by setting a five-position DIP switch, or you can take off 1 ~ 3 jumpers to realize the combined application of 2 ~ 8 programs at will. Through the three-position DIP switch, 2 ~ 8 control outputs can be set, which can be flexibly applied to various small-scale lighting control.
4. The dimming neon lamp program controller is designed by using conventional integrated circuits such as operational amplifier, asynchronous address generator and read-only program memory, which is evolved from the ordinary neon lamp program controller, but its structure is more complicated. Two operational amplifier units PB and PD are used to sample, delay and shape the synchronization signal, so as to obtain the synchronization pulse of the next jump edge near the zero crossing point of alternating current for address counting. A 15-bit address generator is composed of 4141 and 4124 cascaded to drive four program memories to work in parallel.