Attachment to a digital voltmeter for measuring resistance. Scheme, description

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Attachment to a digital voltmeter for measuring resistance. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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The simplest prefix on a field-effect transistor will allow you to measure resistance with a digital voltmeter. The circuit is a simple current stabilizer.

Prefix to a digital voltmeter for measuring resistance

Resistor R* sets the current in the power supply circuit to 1 mA. Field effect transistor - any suitable one.

Publication: N. Bolshakov, rf.atnn.ru

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Memristors - electronics of the future 22.09.2012

Recently, new information has appeared indicating that there is very little left before the practical implementation of memristors. Scientists have found a new material for their manufacture - not yet used in this area, inexpensive and at the same time consistent with alternatives.

Every day we use a variety of electronic devices - from radio alarm clocks and programmable food processors to smart computers. Many of them use flash memory. However, few people know that flash technology has almost reached a dead end and is already approaching the limits of available power and small size.

Further we are waiting for even smaller and faster memory drives, but on completely different physical principles - this, perhaps, is precisely the same transparent electronics, the foundations of which were laid at the University of Oregon. This is a resistive random access memory (RRAM), also called a memristor. This is one of the basic passive elements of microcircuits. The principle of its operation is based on hysteresis - that is, the behavior of the system is determined by its prehistory. When a current passes through the memristor, its atomic structure changes and, accordingly, the resistance of the element. Such elements can be smaller, faster and cheaper than modern transistors - the basis of today's electronics.

"Flash memory is attractive because of its low price and the same size, but its potential is gradually drying up," says John Conley, professor of electrical engineering and computer science at the University of Oregon. , or surfing the web on the glass of a coffee table."

Researchers from Ohio State University have confirmed that an inexpensive and environmentally friendly compound - tin-zinc oxide - has a great future in this area and can become the basis of new technologies where computer memory will be based not on the charge of an electron, but on the resistance of a conductor.

Memristors have a simple structure, are able to write and erase information faster, and consume less energy. There has been interest in the private industry for some time to use these new semiconductors in the production of thin film transistors that drive liquid crystal displays. In particular, the so-called. IGZO technology (indium-gallium-zinc-oxide). However, indium and gallium are becoming more and more expensive, and tin-zinc oxide, also a transparent compound, promises to be commercially more promising.

So the day is not far off when any window pane can become a monitor screen.

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