In this type of circuit, the Emitter and the Base pin of the transistor should be commonly connected to a same voltage, so we have connected it to the Ground potential using two resistors R4 and R3. There are many types of amplifier circuits that are possible with transistor but this is the most commonly used one because it is very good in amplifying low frequency voltage signals like audio signals.Īgain the values of the resistor mentioned above are only for reference (commonly used) you have to design your own circuit based on the application and transistor you are using. The below circuit diagram shows an NPN transistor being used in Common Emitter Amplifier mode. Every transistor has a gain h FE associated with it, which can be used to amplify voltage or current. The resistor R2 is used to limit the current though the collector of the transistor and is not mandatory.Īnother Common application of a Transistor is as amplifiers. The transistor will begin to conduct when the voltage across the Base and Emitter pin exceeds 0.6V this voltage is called as threshold voltage. The resistor R1 is called the Base resistor and is very important to drive a transistor, it limits the base current and failing to use one might damage the transistor permanently. The vales of the Resistor in the above image are only for reference and are not accurate. A very basic circuit diagram is given below in which a NPN transistor is used to turn ON or OFF a load (Motor). It is very similar to a mechanical switch but here we will control the switch using electric signals. One of the most default and primary function of a transistor is to act as a switch. Normally this type of transistor will either be used as a switch or as an amplifier, both of which is discussed below The KSP222A transistor is a general purpose transistor and hence fit into many applications, it is a direct substitute for 2N2222A transistor since they both share almost the same properties except for the Continuous Collector Current (I C)rating and the Collector Emitter Voltage (V BE). So if you looking for an NPN transistor that could switch loads of higher current then KSP2222A might the right choice for your project. It also has a Collector Emitter open Voltage (V CEo) of 40V. KSP2222A can allow collector current upto 600mA and also has power dissipation of 625mW which can be used to drive larger loads than compared with BC547. But there are two important features that distinguish both. The KSP2222A transistor is very much similar to the commonly used NPN transistor BC547. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (VCE) or Base-Emitter (VBE) could be 40V and 600mV respectively. When this transistor is fully biased then it can allow a maximum of 600mA to flow across the collector and emitter. To bias a transistor, we have to supply current to base pin, this current (I B) should be limited to 5mA. The maximum amount of current that could flow through the Collector pin is 600mA, hence we cannot connect loads that consume more than 600mA using this transistor. KSP2222A has a gain value of 100 to 300, this value determines the amplification capacity of the transistor. KSP2222A is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. Continuous Collector current (IC) is 600mA.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |