What is a Unijunctional transistor?
Unijunction transistor is a three-terminal semiconductor device used to control or trigger other electronic devices in low-energy, low-voltage circuits. The device has a single intersection of P-N, called an emitter intersection, between two basic terminals. Unijunction transistors were used in the 70s of the 20th century by electronic fans to create simple oscillator districts. At the beginning of the 21st century, these transistors were commonly used in relaxation oscillator circuits to check the condenser discs and to start the thyristor in the AC (AC) of the control circuits. device. The Unijunction transistor has a high impedance when it is turned off, which means it can resist the current when it is switched off. When it is turned on, it has a low impedance, which means at least resistant to the current Flkvi. Thus, the device can control the flow of the current in the circuit.
when his navig isLadna 1 or B1 grounded and voltage is voltage to its base 2 or B2, terminal, current is produced on the side N emitter connection. Since more voltage is used between B1 and B2, the semiconductor material causes an increase in the conductivity between the emitter and the B1, making it easier to current the current. When the conductivity between the emitter and B1 increases, the emitter voltage naturally reaches back down, which can turn off the transistor. This on-and-off effect creates the desired oscillation or trigger.
The result of these oscillations is that the Unijunction transistor can be used in the trigger circuit together with the capacitor. The capacitor absorbs the current until the emitter voltage on the transistor reaches a certain level when the transistor turns on. The transistor increases the conductivity to the ground when it is turned on so the current can flow from the capacitor to the ground. The result is an oscillation of a triangle.
The programmable Unijunction transistor or put is a special type of Unijunction transistor. Put is a semiconductor device P-N-P-N with contactThe gateway instead of the base P. Put produces oscillations similar to the standard Unijunction transistor, except that its emitter voltage is a different voltage ratio of B2. Programmable Unijunctional devices can be used in a resonant district to modify the oscillation frequency of the circuit.