2N2646 UJT PDF

The device is preferred in other applications where guaranteed minimum pulse amplitude is required and also where a low emitter leakage current and a low peak point emitter current trigger current are required. How to use 2N Transistor 2N has many application circuits but for understanding the working let us consider the relaxation oscillator circuit of the device. In the above circuit we are working 2N as a relaxation oscillator to produce trigger pulses or oscillations. The capacitor C1 is for triggering the UJT and resistor R3 is for limiting the flow of charge to capacitor. The circuit is powered from single power source of VCC.

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The device is preferred in other applications where guaranteed minimum pulse amplitude is required and also where a low emitter leakage current and a low peak point emitter current trigger current are required.

How to use 2N Transistor 2N has many application circuits but for understanding the working let us consider the relaxation oscillator circuit of the device.

In the above circuit we are working 2N as a relaxation oscillator to produce trigger pulses or oscillations. The capacitor C1 is for triggering the UJT and resistor R3 is for limiting the flow of charge to capacitor. The circuit is powered from single power source of VCC. Working When the power just turned ON, the UJT will be in high resistance state and total supply voltage appears across it.

With the flow of time the capacitor gets charged as the current flows through R3 to reach the capacitor. Once the capacitor gets charged to threshold voltage at a certain time T1, it will discharge by forcing the current through emitter of the UJT.

With this current flow at the emitter the UJT will get from high resistance to low resistance state and there by acting as a short circuit. Under such case we will have VB2 or UJT voltage drop taking a sharp dip as shown in graph and at other hand because of current flow a voltage appears across R2 VB1 there by producing a sharp pulse voltage as shown in graph.

With completion of capacitor discharge the UJT will again return to normal OFF state and will stay in that state until the capacitor discharges again. This cycle of capacitor charge and discharge form a triggering cycle for the UJT to give voltage pulses at the output or VB2. By this we have UJT acting as an oscillator giving voltage pulses at the output and in a similar way we can use the device in other application circuits.

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The Unijunction Transistor (UJT)

The 2N model is the most commonly used version of the UJT. The programmable unijunction transistor, or PUT, is a multi-junction device that, with two external resistors, displays similar characteristics to the UJT. It is a close cousin to the thyristor and like the thyristor consists of four p-n layers. It has an anode and a cathode connected to the first and the last layer, and a gate connected to one of the inner layers.

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Unijunction transistor

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