Bipolar stabilized power supply, 3-15/±5 volts 0,25 watts. Scheme, description

Free technical library

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

Bipolar stabilized power supply, 3-15/±5 volts 0,25 watts. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Power Supplies

Comments on the article

Many people are engaged in the development or improvement of bipolar stabilized power supplies for low-power radio equipment of measuring equipment. The proposed device may well replace, for example, the power supply of a digital multimeter, sometimes critical to start.

The described stabilizer is simple, contains a relatively small number of elements and, as observations have shown, has good technical characteristics. It maintains performance without degradation from 3V to 15V input voltage, making it applicable to many other applications requiring a stabilized bipolar power supply.

Bipolar stabilized power supply, 3-15/±5 volts 0,25 watts

The master oscillator of the stabilizer is made using a time-setting capacitor C1 and a Schmitt trigger made on the elements of the 564LE5 (DD1) microcircuit. When a high-level voltage is present at the output of the DD1.3 element, the VD1 diode is in the closed state, and the capacitor C1 is charged from the input voltage source through the resistor R1. As soon as the voltage on the capacitor reaches the trigger threshold, the trigger state will abruptly change to the opposite and a low voltage is set at the output of element DD1.3. Now the diode VD1 opens and the capacitor. C 1 is discharged through this diode, resistor R2 and the output of element DD1.3. When the voltage on the capacitor decreases to the trigger off threshold, it switches to its original state and the generator operation process is repeated.

The output voltage is stabilized by the circuit VT1, R7, R8 as follows. While the voltage at the "+5 V" output is low, the transistor VT1 is closed and does not affect the operation of the generator - its output has the maximum possible pulse duration, and the pauses between them are minimal. At the output voltage of the specified value, the transistor VT1 opens, the charging time of the capacitor C1 increases, and the time it is discharged, on the contrary, decreases. Accordingly, the duration of the pulses that open the composite transistor VT2VT3 decreases, the pause between them increases, as a result of which the output voltage stabilizes.

The stabilizer can use microcircuits of the 564, K561, KR1561 series, containing four inverters.

Diodes - any high-frequency. Capacitors C2 and C6-C9 - oxide K52-1, K50-6, K50-16, the rest - K10-17, KM-5, KM-6. KT3102B transistors are interchangeable with a 1NT251 transistor assembly. Inductors L1 and L2 - DM-0,1 with an inductance of 100 μH. Transformer T1 is made on a magnetic circuit of size K16x10x4,5 made of M2000NM1 ferrite. Each of the transformer windings contains 100 turns of PELSHO 0,1 wire, but the primary winding is wound in two wires.

Set up the device in this order. A load resistor with a resistance of 5 ... 5 Ohm is connected to the output of both arms of the stabilizer (between the +500 V and -600 V terminals). Then a supply voltage of 5 V is applied to the input of the device and the output voltage is measured with a voltmeter. The equality of the input and output voltages is achieved by selecting the resistor R8.

After that, the input voltage is reduced to 3 V and the voltage at the output of the stabilizer is also controlled. In the event of a breakdown in the generation of the clock generator, a resistor R2 is selected. On this, the adjustment of the device can be considered complete.

Author: A.Safronov

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

Diamond is harder than diamond 05.07.2003

Japanese scientists have synthesized artificial diamonds that are harder than real ones. Physicists heated up to 2500 degrees Celsius especially pure graphite under a pressure of 100 thousand atmospheres.

These are higher parameters than in conventional diamond synthesis. The result was crystals with a diameter of several tenths of a millimeter. They, in turn, consist of tightly soldered even smaller crystals, while natural diamonds, as a rule, are single solid crystals.

Their hardness is different under pressure on the diamond from different directions, and in new artificial diamonds it is the same, no matter how hard you press. And higher than that of natural diamonds.

Other interesting news:

▪ Fully functional 70 Mbit static memory chip

▪ Coca-Cola, Apple and IBM are the world's best brands

▪ Neuromorphic chips for artificial intelligence

▪ Jurassic crickets singing bass

▪ Interactive whiteboards in Moscow schools

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Parameters of radio components. Article selection

▪ article by Ramon Gomez de la Serna. Famous aphorisms

▪ article What do St. Bernards wear around their necks? Detailed answer

▪ Film checker article. Job description

▪ article Super-bright LED in a flashlight. Encyclopedia of radio electronics and electrical engineering

▪ article Attachment for a soldering iron. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

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