Electronic load for testing the memory. Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Electronic load for testing the memory. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Power Supplies

Comments on the article

To test and adjust chargers, especially powerful ones, it is desirable to have a load that can "accept" current up to ten or more amperes, and the "voltage" could be changed in the range from several to several tens of volts. Since the current-voltage characteristic of the battery when it is charging is similar to the current-voltage characteristic of a zener diode, an analogue of a zener diode on a powerful field-effect switching transistor can be used as such an equivalent (Nechaev I. "Powerful field-effect switching transistors as voltage stabilizers and limiters." - Radio, 2007, No. 2, pp. 39, 40).

The diagram of the analog of the battery is shown in the figure.

Electronic load for testing the memory

Assembling it is a matter of several tens of minutes, since it contains only a few elements. The equivalent voltage is set by resistor R1. If it is necessary to regulate the equivalent voltage from 2 V, you should use powerful switching field-effect transistors with a low threshold voltage, some of which contain the letter L in the designation, for example, IRL3705N, IRL1404Z, IRL2910. Using "ordinary" transistors, for example, IRF3205, IRF3708, we get the lower adjustment limit of about 4 V.

The upper limit is set by selecting the resistor R2. The internal resistance of the equivalent is a fraction of an ohm, the greater the steepness of the transistor, the smaller it is. Capacitor C1 increases the stability of the device.

Variable and fixed resistors can be any. The capacitor is ceramic K10-17 or similar, it is mounted directly on the terminals of the transistor, having previously shortened the capacitor terminals to the minimum possible length. The connector is a terminal block designed for the required current. Although most powerful switching transistors are designed for high power dissipation (from tens to one hundred watts or more), at a current of more than 8 ... 10 A and a voltage of more than 10 V, heat removal will be problematic. But even at lower current and voltage, an effective heat sink is required, which is desirable to be blown by the M1 fan. You can use a fan from computer equipment with a nominal supply voltage of 12 V. Many of them "start" at a supply voltage of 3 ... 4 V and at a voltage of 8.10 V they already effectively blow over the heat sink.

Author: I. Nechaev

See other articles Section Power Supplies.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Mitsubishi Electric 60" Projection Video Wall Display VS-60HS12U Slim Cube 28.06.2014

Mitsubishi Electric introduced the latest VS-60HS12U Slim Cube video wall display.

The VS-60HS12U Slim Cube projection type display is positioned as an alternative to LCD based displays. It has very thin bezels and is designed for long continuous use.

The display thickness is 52 cm, which is about a quarter thinner than other similar models in the Mitsubishi Electric range, one of which is shown in the illustration. Moreover, the thickness can be reduced to 38,6 cm in some mounting options.

Mitsubishi Electric calculates that video walls assembled from Slim Cube series displays have 85% less bezels between individual screens than LCD video walls. The Slim Cube series displays are designed so that maintenance with full access to the internals of the device is performed from the side of the screen, eliminating the need to access the back of the video wall.

Another advantage is the long service life, estimated by the manufacturer at 110 hours or more than 000 years of continuous operation.

Other interesting news:

▪ Glue for the brain

▪ SD-M1912 - new DVD-ROM driver

▪ The temperature in the Arctic has reached a maximum

▪ Beam splitter roof for solar greenhouse

▪ Bacteria-powered nanorobots

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Digital technology. Article selection

▪ article Nook. Popular expression

▪ article What is silicon? Detailed answer

▪ article Upholsterer. Standard instruction on labor protection

▪ article Self-made amplifier on the TDA 7294 chip (part 2). Encyclopedia of radio electronics and electrical engineering

▪ article Levitation of small objects. Focus Secret

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews