How do you wire a transistor as a switch?
To connect the transistor as a switch in a circuit, we connect the output of the device that will switch on the transistor to the base of the transistor. The emitter will connect to ground of the circuit. And the collector will connect to the load that the transistor will turn on and the supply voltage of the circuit.
What is transistor 2222a?
The 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds.
How the transistor works as a switch?
One of the most common uses for transistors in an electronic circuit is as simple switches. In short, a transistor conducts current across the collector-emitter path only when a voltage is applied to the base. When no base voltage is present, the switch is off. When base voltage is present, the switch is on.
How can we make transistor as a switch?
For a PNP transistor, the Emitter potential must be positive with respect to the Base. Then the transistor operates as a “single-pole single-throw” (SPST) solid state switch. With a zero signal applied to the Base of the transistor it turns “OFF” acting like an open switch and zero collector current flows.
What is the gain of a 2N2222?
2N2222A has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 800mA, hence we cannot connect loads that consume more than 800mA using this transistor.
What is the need of a transistor in the fingertip switch experiment?
This is because, high skin’s resistance prevents enough current to flow through the circuit. So the only option we have is to amplify the tiny current flowing through the skin to a magnitude enough for an LED to glow. For that purpose, we have to use transistors.
Can I use BC547 instead of 2n2222?
You can update the circuit at anytime, you can replace the 2n2222 NPN transistors with the BC547 and it will have no negative effect on the project.
How is a 2N2222A transistor used in an amplifier?
How to use 2N2222A This transistor like all can be used either as a switch or as an amplifier. The Base-Emitter voltage of this transistor is 6V so you just have to supply this voltage across the base and emitter of the transistor to induce a base current into the transistor.
What are the features of the 2N2222A pinout?
2N2222A Pinout Configuration Pin Number Pin Name Description 1 Emitter Current Drains out through emitter 2 Base Controls the biasing of transistor 3 Collector Current flows in through collector
What’s the difference between BC547 and 2N2222A transistor?
The 2N2222A transistor is very much similar to the commonly used NPN transistor BC547. But there are two important features that distinguish both. 2N2222A can allow collector current upto 800mA and also has power dissipation of 652mW which can be used to drive larger loads than compared with BC547.
How much current is allowed in a bias transistor?
To bias a transistor we have to supply current to base pin, this current (I B) should be limited to 5mA. When this transistor is fully biased then it can allow a maximum of 800mA to flow across the collector and emitter.