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A crowbar circuit is an electrical circuit used for preventing an overvoltage or surge condition of a power supply unit from damaging the circuits attached to the power supply. It operates by putting a short circuit or low resistance path across the voltage output (V o ), like dropping a crowbar across the output terminals of the power supply.
Thyratrons are also used in high-power UHF television transmitters, to protect inductive output tubes from internal shorts, by grounding the incoming high-voltage supply during the time it takes for a circuit breaker to open and reactive components to drain their stored charges. This is commonly called a crowbar circuit.
Circuit diagram of a simple Crowbar circuit, with an 8V nominal output (7.6V with SD1).
When a circuit must be protected from overvoltage and there are failure modes in the power supply that can produce such overvoltages, the circuit may be protected by a device commonly called a crowbar circuit. When this device detects an overvoltage it causes a short circuit between the power supply and its return.
In this case, the gate is connected to the telecom circuit power supply (via a diode or transistor) so that the device will crowbar if the transient exceeds the power supply voltage. The main advantage of this configuration is that the protection voltage tracks the power supply, thus eliminating the problem of selecting a particular breakdown ...
A deputy used a crowbar to get them out. Inside the main residence, a 9-year-old girl was found alone crying in a loft with no protection from falling, according to a criminal complaint.
Circuit diagram of a simple Crowbar circuit, with an 8V nominal output ... Is there a high quality electronics-related circuit design that catches your eye? Please ...
Rutherford native Chris Ford is better known as former WCW champion Crowbar. But around here, he's also known as a physical therapist. Pro wrestler Crowbar works magic outside the ring as a ...