The timing of the control signals of different types of digital potentiometers is not the same. In practice, the timing regulations must be strictly observed. Otherwise, it may work abnormally. Note that the distortion of the control signal waveform will cause the digital potentiometer to work abnormally. The simple solution is to connect a small filter capacitor between the control signal and the ground. However, the capacitance of the capacitor should be selected to make the rising edge of the pulse signal too large. The falling edge is slowed down, the bowing time is asked, and the anti-interference effect is too small. The specific value can be estimated or selected according to experience. If the digital potentiometer 8042 is used to control the signal from the port of the single-chip 8031, the internal pull-up resistor value is 1呜 filtered cutoff frequency, =50 can be obtained as 0021 flat, and the pulse width of the 8031 ​​is 2 crystal oscillator. For 6, so the factory 2, 2, the position should be 121 妒 2 dull vibrating to 625 of 1 select practice, in the crystal oscillator for 6 Le 8031 ​​system, select 1 filter capacitor, the effect seems to be good.
In addition, the resistance of digital potentiometers varies linearly, but also varies by logarithmic law, such as 9514, 316631801, etc. Pay attention when choosing. If the digital potentiometer is controlled by a mechanical push button switch, reliable debounce measures should be taken to eliminate the effects of switching jitter. It is a simple and effective measure to construct a debounce switch circuit from the structure of the insect generator and the mechanical switch.
The effect of the ruler and jitter is very limited and should not be used in such situations.
When using a digital potentiometer as the negative feedback resistor of an amplifier, it is necessary to prevent transient failures that may occur during use. Because the transient failure will make the integrated op amp in an open loop state. The release device gains a lot. It is a simple and effective measure to pass the input clamp of the amplifier's rear stage circuit. 6 Conclusion There are many kinds of digital potentiometers on the market, and the performance is different. In practice, we must pay attention to the following points. The basic performance and basic usage of the basic principle of the 7-inch digital potentiometer should be fully understood. This is the basis for the selection of digital potentiometers; first, according to the actual application needs, both application effects and simplified application design. Reasonable choice of the type of the number of the Ning clamps The current price is no longer a blue factor considered in the selection; first, the rational design can effectively overcome the shortcomings of the digital potentiometer and expand its application. Therefore, the hydrological discussion has a guiding role in the application of digital potentiometers.
1 under 0, with digital potential; 1 Shenzhen gain 1. Seven children's products for 4 weeks to win the sea. Automatic compensation of the load characteristics of potentiometer displacement sensors. Air compressor control solution Air compressor unit is a must for many companies. According to the gas condition of the construction site, it is necessary to control the opening and closing of the air compressor, such as periodic maintenance and emergency stop, etc., and control the speed of the compressor through the frequency converter to adapt to the changing wind conditions to achieve the purpose of power saving. All of these require sequential operation of the associated switching valve and control of the frequency converter to complete. During operation, it is required to check the condition of the unit frequently, and should stop in an emergency when the rated current of the temperature and pressure motor exceeds the allowable value. If the pressure is too large, the inverter is required to reduce the motor speed and stop part of the air compressor if necessary. If human monitoring is used, human resources are wasted. Surveillance personnel are prone to fatigue. Very unsafe. therefore. The use of industrial computer automatic intelligent monitoring solutions is being widely used.
There is a station in the mining area, seven 7 electric fixed water-cooled air compressor unit. 24 hours of uninterrupted work, requires remote operation start and stop, parameter abnormal automatic parking frequency conversion energy-saving operation. Because the voltage in the mining area is unstable. In particular, the opening and closing of the air compressor has a great interference to the power grid, and the vibration is strong and the dust is often in a bad environment. To ensure the safety and stability of the system. The use of research sample industrial control machine 0 anger 2 and other control Mei 2 industrial control machine by 81 in the chassis liver 631 through the bottom plate.
Only 1622 industrial grade people have long card industrial power supply, 270 and so on. The safety factor of the system is very high.
20 7 4 data acquisition card in this system. The 64-channel high-gain multi-function 05 card line interface is used to perform 0-conversion on 32 differential analog signals to collect detection point data.
The 310616 control card provides 16 relay outputs and 16 optically isolated digital inputs. The relay output is used to control power switches or switch control devices such as cooling water pump switches. Intake valve exhaust valve switch main motor start and stop, etc., 16 way light Luo Luoyu input for monitoring points, off signal input, high alarm point pressure maximum threshold and so on.
4 frequency conversion controller is controlled by industrial computer to control its operation, change the output voltage frequency to change the motor speed to change the air compressor speed 8051 single-chip technology seminar. The 805 single-chip technology seminar hosted by Xinhualong Electronics Co., Ltd. was held on March 30th. Shenzhen was held in Shanghai on April 1st in Beijing on April 4th. At the meeting, the development trend of 8-bit single-chip microcomputer was discussed. 805, 1 technology should be no; 1. Flow motor control 805, 1 single-chip ultra-low power consumption scheme, 8051 30 30 single-phase intelligent current and voltage scheme. , 8,51 20 industrial measurement and control Ethernet measurement and control module solutions, etc.
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|
Product |
Diameter(mm) |
Length(mm) |
Color |
Density(g/cm³) |
|
POM ROD |
15-120 |
2000 |
white/black |
1.42 |
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