2N1804

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Thyristors - SCRs

A silicon-controlled rectifier (SCR) is an electronic device that provides ongoing switching control over standard three-phase AC power to control its flow. It is a type of thyristor which is a general term used to describe both TRIACs and SCRs. Silicon-controlled rectifiers, or SCRs, are also known as thyristors, triacs, and silicon-controlled switch. They are used to control the output of a power circuit by allowing a lower voltage to control a much higher voltage.

2N1804 Application Field

• High speed switching applications
• Power converters
• Motor speed and direction control
• Facility monitoring systems
• Light triggering systems
• Heating and solid-state lighting
• Energy efficient AC motors

2N1804 Working Principle

The working principle of 2N1804 SCR is based on the triggering of the gate terminal to allow current to flow through the device, maintaining a low voltage at the gate. When a current is applied to the gate terminal, it creates a conductive path allowing current to flow from anode to cathode. A 2N1804 rectifier keeps the gate low until a specific voltage is reached, at which point the device turns off again. When the gate is triggered again, the device starts to conduct again.

When using an SCR, it is important to note that the gate requires a higher voltage than the anode and cathode to turn on, and the time it will stay on will depend entirely on the amount of current flowing through it. For example, if the gate voltage is too low, the SCR will not turn on, and if it is too high, the device will not turn off.

2N1804 SCR can be used to create pulses and oscillations, allowing the user to control the speed of the pulses and thus the speed of the motor. This can be used to regulate the speed of motors with high precision, allowing them to run at a constant speed regardless of changes in load or voltage. Additionally, it can be used to create electronic starters for motors, making it more efficient and reliable.

In summary, the 2N1804 SCR is an ideal component for high speed switching, providing an efficient and reliable way to regulate and control power in an AC circuit. It is capable of controlling current in both directions, depending on the polarity of the voltage applied, and is suitable for use in a wide range of applications from lighting control to motor regulation. As a result, it is a perfect choice for those looking for a low-cost, highly efficient solution for their power transistors needs.

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