Soldering iron power regulator. Scheme, description

Free technical library

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

Soldering iron power regulator. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

Comments on the article

The included soldering iron, lying on the stand for a long time, overheats. The tip of the soldering iron burns, and it has to be cleaned and tinned frequently. In order to exclude overheating of the soldering iron in such cases, the stand is often supplemented with devices that reduce the voltage on the soldering iron.

A diagram of one of these devices is shown in the figure.

Soldering iron power regulator

Photoresistor R1 and light bulb H1 are mounted on a stand opposite each other on both sides of the soldering iron. If the soldering iron is removed from the stand, the light bulb illuminates the photoresistor, reducing its resistance. A current flows in the control electrode circuit of the SCR V2, sufficient to open the SCR during almost the entire positive half-cycle of the supply voltage. As a result, the current through the soldering iron flows both during the negative half-cycle of the mains voltage (through the V1 diode and the H1 bulb) and during the positive one (through the V2 trinistor and the H2 bulb). The soldering iron will have almost full mains voltage.

When the soldering iron is placed on the stand, it blocks the light from the bulb H1, and the resistance of the photoresistor increases. The trinistor closes (this is evidenced by the H2 light - it goes out). The current through the soldering iron will now flow only during the positive half-cycle of the mains voltage, which is equivalent to reducing the voltage on the soldering iron to about 160 V. This does not allow the soldering iron to overheat, but at the same time prevents it from cooling significantly. Within a few seconds after the soldering iron is removed from the stand, the voltage on it will increase again, and the soldering iron will be ready to work.

This power regulator can also be used at a voltage of 127 or 48 V. In all cases, almost any powerful trinistor is suitable for it, even with a non-standard reverse voltage (in our case, it is small and does not exceed the sum of the voltage drops on the H2 bulb and the V1 diode with direct current ).

The diode can be replaced by another, designed for the amplitude voltage of the network and half the current through the soldering iron. A current flows through each of the bulbs, 1,4 times less than the current of the soldering iron. Therefore, light bulbs are chosen depending on the power of the soldering iron. For example, with bulbs for 2,5 V at a current of 0,15 A, the regulator is able to work with a soldering iron with a power of not more than 45 W at a mains voltage of 220 V. By setting the bulbs for 3,5 V at a current of 0,26 A, you can connect a soldering iron to the regulator with a power of 50 ... 80 W.

Author: A.Aristov, Pervouralsk

See other articles Section Ham Radio Technologies.

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

Monkey tools 05.11.2007

Canadian and German archaeologists have unearthed in Côte d'Ivoire a "workshop" of ancient chimpanzees who cracked nuts 4300 years ago using a stone hammer and a wooden anvil.

The fact that these tools belonged to a chimpanzee, and not to a person, is proved by the size of the stones, which are too large for a human hand, and the shells of nuts found right there, inedible for humans. In addition, the most ancient traces of human presence in this region date back only to the beginning of our era.

Other interesting news:

▪ Texas Instruments releases library for MSP430 and CC1100/CC2500

▪ Simulating a volcanic eruption

▪ The main component of interstellar ionized gas has been obtained

▪ Biodegradable stent for children with respiratory diseases

▪ Fast trains are not the best

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Low frequency amplifiers. Article selection

▪ article Bestuzhev Alexander Alexandrovich. Famous aphorisms

▪ article How are the Rostov streets Vertical and Horizontal located relative to each other? Detailed answer

▪ article Desktop drilling machine. home workshop

▪ article Extender for remote control. Encyclopedia of radio electronics and electrical engineering

▪ article VHF radio receiver on KHA058. 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