Car enthusiast testers. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

Comments on the article

When troubleshooting vehicle wiring, you often have to use measuring and testing instruments. This probe is a combination of the simplest voltage and resistance indicators. The use of this device provides certain advantages over others, since the probe is always ready for use, the batteries are charged during operation, the probe does not contain switches, which is convenient when using it. The probe can control the presence of voltage from 6 ... 7 V, check the serviceability of diodes, transistors, capacitors, distributors, switches.

On fig. 1 is a schematic diagram of the probe. In the "dialing" mode, when the probes are closed, the HL1 LED lights up. When a minus is connected to probe 1, and to probe 2, respectively, the plus of a current source, the HL2 LED lights up. Resistor R1 is limiting, its resistance is selected to work with voltages up to 28 V. LEDs HL1 - red, HL2 - green.

On fig. 2 shows a modified probe circuit with a blinking HL3 LED. When the reed switch is closed, i.e., a magnet is brought to the probe body, the probe operates in the circuit according to fig. 1. When the reed switch is open, the probe is used as a signal generator, probe 1 is connected to the wire that needs to be ringed, probe 2 is connected to ground. At the other end of the wire, a probe is connected, the circuit of which is shown in Fig. 1 (probe 2 to ground). When the circuit is closed, that is, when the correct wire is found in the bundle, the LEDs of the probes start flashing. The device is very economical, since the generator starts working only when the right wire is found. LEDs HL1 - red, HL2 - green, HL3 - red flashing.

On fig. 3 shows a schematic diagram of another probe. It allows you to control the voltage level. The principle of its operation is the same as in the probe according to the scheme of Fig. 1, except that depending on the voltage level, a different number of LEDs will light up. LEDs HL1 - red, HL2-HL5 - green.

On fig. 4 shows a diagram of a probe that allows you to control the presence of voltage from 2,5 V (i.e., this probe can be used to test devices on logic microcircuits). The design provides illumination for work in hard-to-reach places. When the probes are closed to each other, a minus is applied to the base of the transistor VT1, it opens and the HL2 LED lights up. Probe 1 is connected to the body. If a voltage of about 2 ... 2 V is applied to probe 3, then the transistor VT2 will open and the HL3 LED will light up. When the voltage increases to about 6 ... 7 V, the HL1 LED will light up, the transistor VT2 remains open and the HL3 LED will be constantly on. Resistor R4 determines the opening threshold of transistor VT1. The backlight battery is charged through the limiting resistor R2 and the diode VD1, when SA1 is closed.

LEDs HL2 - red, HL1, HL3 - green.

Resistors R1-R5 - MLT-0,25. I recommend LEDs HL1 - HL5 of the KIPD-40 type, but any others can be used (in the circuit in Fig. 2, HL3 is any blinking LED). Transistors VT1 - KT361 series, VT2 - KT315 series or the like, VD1 - any diode for a current of 0,26 A. GB1 - a battery of three cells. I recommend batteries from hearing aids with a capacity of 0,03 Ah, but you can use any other. GB2 - a rechargeable battery composed of five cells with a capacity of 0,26 Ah or similar. Probe 1 is made in the form of a wire with a crocodile clip at the end. Probe 2 - a needle made from a straightened and sharpened piece of spring, to be able to disassemble automotive connectors. The probes are assembled by hanging mounting, their performance is checked. Then they are placed in a mold made of plasticine or cardboard and filled with epoxy. After the resin has hardened, the probe is processed with a file. To charge the batteries, the probe is included in the voltage measurement circuit.

Author: A.Medvedev, Yaroslavl

See other articles Section Automobile. Electronic devices.

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 Gadget battery charges in one minute 09.04.2015 Scientists from Stanford University have invented a high-performance battery that charges quickly, holds a charge for a long time and has a low cost. The researchers believe the development could replace many types of commercial lithium-ion and alkaline batteries. The researchers did not report on the capacity of the developed battery, but said that their technology could be used in almost any device - from smartphones to electric cars and wind turbines. If such a battery is placed in a smartphone, it can be fully charged from the mains in one minute, the scientists reported. In modern phones, it takes several hours to charge the battery. In the design of the new battery, the researchers used aluminum, a promising material for the industry of rechargeable power supplies, which allows to reduce costs, provide a higher charge density and have less flammability. From aluminum, scientists at Stanford University made an anode - the positive pole of the battery. The cathode (negative pole) they made of graphite. A liquid electrolyte was placed in the battery, enclosed in a polymer bag. "People have tried various cathode materials. We accidentally found that the best way to use a graphite cathode, which is mostly carbon. We found several types of graphite material with high performance," said Hongjie Dai, professor of chemistry at Stanford University. participating in the development. Scientists managed to achieve a long service life of the experimental battery. It withstood over 7,5 thousand recharge cycles without loss of properties. Previous prototype aluminum batteries degraded after only 100 cycles, Dai said. In comparison, today's batteries last about a thousand cycles without significant loss of capacity.

Other interesting news:

▪ Genetic engineering will turn people into supermen

▪ Male and female brains work differently

▪ Iron mining on Mars

▪ Sea of ​​carbon found

▪ Sports and fasting

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Batteries, chargers. Article selection

▪ article History of culture. Crib

▪ article What are solar flares? Detailed answer

▪ article Installation work with tools and fixtures. Standard instruction on labor protection

▪ article A simple pocket radio station for the village. Encyclopedia of radio electronics and electrical engineering

▪ article The King and the Jester. Focus secret

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

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

www.diagram.com.ua
2000-2024