What does crowbar mean in electronics?

What does crowbar mean in electronics?

power supply protection circuit
Glossary Term: crowbar Definition. A crowbar circuit is a power supply protection circuit that rapidly short-circuits (“crowbars”) the supply line if the voltage and/or current exceeds defined limits. In practice, the resulting short blows a fuse or triggers other protection, effectively shutting down the supply.

Why is it called a crowbar?

The accepted etymology identifies the first component of the word crowbar with the bird-name “crow”, perhaps due to the crowbar’s resemblance to the feet or beak of a crow. The first attestation of the word is dated back to circa 1400. The term jammy or jimmy most often refers to the tool when used for burglary.

What is a crowbar SCR?

The SCR over voltage crowbar or protection circuit is connected between the output of the power supply and ground. It also clamps the gate voltage at ground potential until the Zener turns on. The capacitor C1 is present to ensure that short spikes to not trigger the circuit.

What is the purpose of crowbar answer?

A crowbar is a metal tool used mainly to pry things open. Common uses for larger crowbars are: removing nails, prying apart boards, and generally breaking things. Crowbars can be used as any of the three lever classes but the curved end is usually used as a first-class lever, and the flat end as a second class lever.

What is a crowbar used for?

The crowbar is a single metal bar with a single curved end and flattened points, often with a small fissure on one or both ends for removing nails or to force apart two objects. The iron lever is commonly used to open nailed wooden crates or pry apart boards.

Why is it called a Jemmy?

The accepted etymology identifies the first component of the word crowbar with the bird-name “crow”, perhaps due to the crowbar’s resemblance to the feet or beak of a crow. The term jammy or jimmy most often refers to the tool when used for burglary.

What is DIAC and its application?

The DIAC (diode for alternating current) is a diode that conducts electrical current only after its breakover voltage, VBO, has been reached momentarily. DIACs have no gate or trigger electrode, unlike some other thyristors that they are commonly used to trigger, such as TRIACs.

Where is SCR used?

SCRs are mainly used in devices where the control of high power, possibly coupled with high voltage, is demanded. Their operation makes them suitable for use in medium- to high-voltage AC power control applications, such as lamp dimming, power regulators and motor control.

How long is a crowbar?

Sizes. Crowbars can be anywhere between 8 and 36 inches.

Is a crowbar a weapon?

The Crowbar is an iconic melee weapon and the signature weapon of Gordon Freeman. It is the first weapon acquired in Half-Life, serving as a signature melee weapon and a tool for puzzles. The crowbar is also used as a tool for breaking open supply crates and clearing destructible obstacles.

Where does the phrase jimmy come from?

A thief might jimmy a car door to steal its stereo, and if you accidentally paint your kitchen window shut, you may have to jimmy it open. The verb jimmy comes from the noun jimmy, or “short crow bar,” the kind of tool you’d use to jimmy something. In the 1800s, this type of crowbar was popular with burglars.

What are crowbars used for?

It is used as a lever either to force apart two objects or to remove nails. Crowbars are commonly used to open nailed wooden crates. Common uses for larger crowbars are: removing nails, prying apart boards, and generally breaking things.

What is difference between TRIAC and DIAC?

TRIAC stands for Triode AC switch. DIAC is a bidirectional device that lets current pass through it in both directions when the voltage across the terminals reaches break-over voltage. TRIAC is also a bidirectional device that lets the current pass through it when its gate terminal is triggered.

What are the advantages of DIAC?

The advantage of a DIAC is that it can be turned on or off simply by reducing the voltage level below its avalanche breakdown voltage. DIACs are also known as a transistor without a base.

How SCR is triggered?

To trigger, or fire, an SCR, voltage must be applied between the gate and cathode, positive to the gate and negative to the cathode. When testing an SCR, a momentary connection between the gate and anode is sufficient in polarity, intensity, and duration to trigger it.

How SCR can be turned off?

When the anode current is reduced below the level of the holding current, the SCR turns off. The voltage reverses every half cycle in an ac circuit, so that an SCR in the line would be reverse biased every negative cycle and would turn off.