Car battery current indicator
Encyclopedia of radio electronics and electrical engineering /
Automobile. Electronic devices
Comments on the article
Proper operation of the car battery is the key to a long service life and normal operation of the entire power supply system. Monitoring the battery charge-discharge mode allows you to take the necessary preventive measures in time, as well as monitor the health of the generator, starter, and electrical wiring.
The indicator measures the voltage drop on the conductor connecting the negative terminal of the battery to the car body. This conductor is included in the resistive measuring bridge R1-R5, which allows you to remove bipolar signals from the bridge and amplify their op-amp with a unipolar supply. Logarithmic diodes VD1-VD1 are included in the negative feedback circuit of the op-amp DA4, which expand the limits of the measured current, making it possible to measure even the current consumed by the starter when starting the engine.
The recording device can be any magnetoelectric milliammeter or microammeter with a zero-mid scale, for example, M733 with a full deflection current of the needle of 50 μA. It is most convenient to place three marks evenly on the scale to the right and left of zero: 5 A, 50 A and 500 A. The indicator is powered by a parametric stabilizer for a voltage of 6,6 V. The output of the resistor R5, right according to the scheme, is left permanently connected directly to the negative terminal of the battery.
To calibrate the indicator scale, it is first supplied with power directly from the battery and the microammeter needle is set to zero with a trimmer resistor R4. Then, with the ignition key turned off (in order to prevent the flow of uncontrolled battery current), the positive terminal of the battery through a powerful (about 60 W) resistor with a resistance of 2,4 ohms is connected to the car body and the trimming resistor R7 set the arrow to 5 A. After grading, the positive power terminal indicator is connected to the positive wire of the vehicle's on-board electrical network. There is no need to check the calibration at a current of 50 and 500 A.
Author: L. Mashkinov, Radio 4 1989; Publication: cxem.net
See other articles Section
Automobile. Electronic devices
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
Artificial leather for touch emulation
15.04.2024
In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>
Petgugu Global cat litter
15.04.2024
Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>
The attractiveness of caring men
14.04.2024
The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>
|
Random news from the Archive
sensitive road
02.03.2000
If carbon fibers are mixed into concrete, such a road surface will change its electrical conductivity under the influence of the weight of cars passing on it.
Deborah Chang from the University of Buffalo (USA), who discovered this effect, suggests using it to make roads sensitive to the movement of cars and even bicycles.
It will be possible to measure the weight of heavy vehicles on the move (and charge them a fare corresponding to the weight), determine the location and speed of individual vehicles, use their signals to switch traffic lights.
|
News feed of science and technology, new electronics
We recommend downloading in our Free technical library:
▪ section of the Wonders of Nature website
▪ Electronique Pratique magazines (annual archives)
▪ The book The practice of radio editing. Tarasov F.I., 1949
▪ article What is the largest island? Detailed answer
▪ article Solar Ponds. Encyclopedia of radio electronics and electrical engineering
▪ article Power supply for Ethernet switch D-Link DES-1005D. Encyclopedia of radio electronics and electrical engineering
▪ reference book Service menus of foreign TVs. Book #12
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese