A transistor probe that can be used to test transistors without soldering them out of the circuit. Scheme, description

Free technical library

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

A transistor probe that can be used to test transistors without soldering them out of the circuit. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Measuring technology

Comments on the article

You can not install a microammeter with a resistor and a switch (i.e. short-circuit contacts 2 and 5 P2K) - although you can evaluate the collector current with it, i.e. select transistors in pairs.

Transistor probe without soldering the transistor out of the circuit
Rice. 2. Blocking oscillator as a transistor probe

L1 - 100 turns of wire 0.1 mm; /
L2 - 50 turns of wire 0.1 mm; -----> all this is wound on a ferrite ring 10-12 mm in diameter.
L3 - 200 turns of wire 0.1 mm; /

In theory it should work like this:
1. If the transistor is normal and the transistor type switch - corresponds to the real type - then at some offset (position of the resistor engine) a squeaker sounds and the light does NOT light up;
2. If the transistor type switch - DOES NOT correspond or the transitions of the transistor burned out - the tweeter DOES NOT sound and the lamp DOES NOT light up;
3. If the transistor type switch - corresponds to the real type of the transistor, the internal short circuit - the buzzer does NOT sound and the light is on.

The bulb and probes for the COLLECTOR and EMITTER can be used as a simple short circuit probe. ONLY PLEASE NOTE - when the power is on, the BATTERIES DISCHARGE, do not leave the probe turned on in vain or put not a SWITCH, but a BUTTON with normally open contacts. Although in general, this probe has one, but a BIG drawback - in order to use it, you need to have THREE HANDS :)

Literature

Radio Hobby No. 5 1999

Publication: cxem.net

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

New cable gateways from Netgear 22.02.2014

Netgear has introduced two new cable gateways. The new devices provide, on the one hand, fast Internet access, and, on the other hand, high-speed WiFi, allowing cable network subscribers to get rid of the need to pay for modem rental every month, the company told CNews.

With the release of new devices, Netgear's line of cable modems and gateways includes three devices: the AC1750 WiFi Cable Modem Router (C6300), which combines a cable modem operating at speeds up to 680 Mbps in one device, and a Gigabit WiFi router that provides speeds up to 1750 Mbps; cable modem router N450 WiFi - a gateway that provides cable modem speeds up to 350 Mbps and WiFi speeds in the 2,4 GHz band up to 450 Mbps; cable modem CMD31T DOCSIS 3.0, for direct connection to a high-speed cable network of an Internet provider.

The Netgear N450 WiFi Cable Modem Router is now available at retailers and online stores. MSRP in the US is $119.99.

The C6300 cable modem router will ship in the second quarter of 2014 at a suggested retail price of $219.99.

Other interesting news:

▪ Twilight of the Universe

▪ Computer mouse can type

▪ X-ray laser on the table

▪ LEDs for street lighting

▪ New low power op amps for portable applications

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Power supply. Article selection

▪ article We all learned little by little, something and somehow. Popular expression

▪ article What causes champagne to foam? Detailed answer

▪ article Packaging of oil products in barrels and small containers. Standard instruction on labor protection

▪ article High voltage transformer. Encyclopedia of radio electronics and electrical engineering

▪ article Extraction of coffee and chicory dyes with water. Chemical experience

Leave your comment on this article:

All languages of this page

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