Probe-generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
Comments on the article
Readers are offered a simple probe-generator for "ringing" cables and electrical circuits, in which a damaged electronic wrist watch is used.
It is known that the liquid crystal display (LCD) of such watches is powered by a signal source with a frequency of 512 Hz. This is what serves as the ringing signal. To make a probe, you need to remove the LCD from the clock and, when the power is on, use headphones to find a contact on which there will be a signal with a frequency of 512 Hz. For most watches, this is one of the terminals of a frameless capacitor. A probe is soldered to the established contact (see figure) - and the probe is ready. The volume of its sound is quite sufficient for dialing.
The peculiarity of such a probe is its very small dimensions and high efficiency. In dial-up mode from a 1,5 V battery, it consumes a current of 0,7 mA.
Author: R.Zhukov
See other articles Section Measuring technology.
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 Nanobots to be launched into human veins
30.07.2016
Researchers at Drexel University have demonstrated how an electromagnetic field can be used to make tiny robots move faster in a liquid medium. Scientists plan to use these devices in the future to deliver drugs through blood vessels.
Nanobots are chains of tiny round particles. The magnetic field rotates the particles, like a screw, while the longer the chain, the greater the speed it can develop. The scientists tested various robots, starting with strings of three "beads". The longest device consisted of 13 particles and reached a speed of 17,85 micrometers per second.
In order for the robots to move, an external magnetic field was applied. The faster the rotation speed of the field, the faster the chains moved. At the same time, the high frequency led to the division of long devices into shorter ones. So, a robot of seven beads, upon reaching a certain speed, begins to deform and is divided into two chains of three and four particles. The direction of the magnetic forces can be changed so that the two robots move in opposite directions.
The chains can be modified to serve as a drug delivery system as well as perform various tasks during surgical procedures. For example, robots can clean veins and arteries blocked by clotted blood cells or cholesterol plaques.
|
Other interesting news:
▪ Trap for the light
▪ The aliens didn't find us
▪ Emission-free aircraft
▪ Laptop pulse sensor
▪ Cheap and easy growing of living tissue
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Life of remarkable physicists. Article selection
▪ article Soft-bodied intellectual. Popular expression
▪ article How Many Magi Came to Worship Jesus? Detailed answer
▪ article Galaganiya odorous. Legends, cultivation, methods of application
▪ article Thermostat for a water tank. Encyclopedia of radio electronics and electrical engineering
▪ article Norms of acceptance tests. Tubular arresters. 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
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese