Zener ID. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
Comments on the article
Now the element base of various companies and countries of origin is available to the Russian radio amateur. On the one hand, this is good, but on the other hand, it can be very difficult to find the necessary, at least brief information on a particular product.
For example, you hold in your hands a "glass" with two conclusions - what is it? Diode? Zener diode? And if a zener diode, then at what voltage? In this case, it is useful to keep a simple attachment to the multimeter on hand, which allows you not only to distinguish the diode from the zener diode, but also to determine the stabilization voltage of the zener diode in the range up to 35 V.
The circuit is a DC-DC converter with galvanic isolation between input and output. This allows the set-top box to be powered from a multimeter source.
The PWM generator is made on a specialized microcircuit MC34063. To ensure complete galvanic isolation between the power supply and the measuring circuit, the control voltage is removed from the primary winding of the transformer. For this, a separate rectifier was made on VD2. The stabilization point (output voltage value) is set by selecting R3.
A voltage of about 4 V is released on the capacitor C40. The current stabilizer A2 and the tested zener diode VDX form a parametric stabilizer, and the multimeter connected to X1 and X2 measures the voltage on this zener diode.
When connected with the anode to "+", and the cathode to "-" of a diode or an asymmetric zener diode, the multimeter will show the minimum voltage. If you connect in reverse polarity (like VDX in the diagram), then for the diode the readings of the multimeter will be about 40 V, and for the zener diode, the stabilization voltage (if it is below 40 V).
For a symmetrical zener diode, the stabilization voltage will be displayed for any connection polarity.
Transformer T1 is wound on a ferrite ring with an outer diameter of 23 mm. Winding 1 contains 20 turns, winding 2 - 35 turns of PEV 0,43 wire. Winding - turn to turn.
The primary winding is located on one part of the ring, the secondary - on the opposite. It is not necessary to superimpose one winding on another.
Establishment. Instead of the VDX zener diode, connect a 10 kΩ resistor to the terminals and, by selecting the resistance R3, ensure that C4 is 40 V.
Author: Karavkin V.
See other articles Section Measuring technology.
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 Synchronous DC-DC Regulators Texas Instruments LM76002/3
18.04.2018
Texas Instruments has released new buck converters with up to 60 V input and up to 2.5 A output for the LM76002 and up to 3.5 A for the LM76003.
With a wide input voltage range, it is possible to simplify input protection circuits for 24V applications in industrial and automotive systems. Switching frequency adjustable over a wide range (350...2200 kHz) allows you to optimize the device either in terms of power loss or in terms of the space occupied by the solution on the board. The ICs have a large pad on the bottom of the package, which is designed to absorb power losses, which ensures excellent thermal behavior.
The presence of special grooves inside the pins of the microcircuit improves the quality of the solder joint and provides 100% visual control of the assembly process.
Technical specifications:
input voltage range: 3,5...60 V (maximum 65 V);
output voltage from 1,0 V to 95% of Vin;
rated output current: up to 2,5 A (LM76002) and up to 3,5 A (LM76003);
frequency is adjusted in the range: 350...2200 kHz;
low self-consumption current: 15 μA;
maximum efficiency reaches 97%;
configurable soft start (6,3ms by default);
the presence of a Power-Good output;
the ability to select the operating mode with forced PWM (FPWM);
high efficiency at low load (Light-Load Architecture mode);
operating temperature range -40...150°С;
case WQFN-30 size 4x6 mm;
there are versions of microcircuits with automotive qualifications.
Typical applications:
automotive electronics;
telecommunication equipment;
CCTV;
software logic controllers;
power supply systems from tires 24/48 Volt.
|
Other interesting news:
▪ Frequent selfies talk about problems in intimate life
▪ AOC AGON PRO AG274QGM Gaming Monitor
▪ Artificial intelligence will be able to approach the capabilities of the human brain
▪ Desert plumbing
▪ organic meteorite
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Sites of amateur radio equipment. Article selection
▪ article yellow press. Popular expression
▪ article Where did the word penal servitude come from? Detailed answer
▪ article Gas electric welder. Standard instruction on labor protection
▪ article A simple device for checking phones. Encyclopedia of radio electronics and electrical engineering
▪ article Crystals - how to adjust their size. Chemical experience
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