Sensors All kinds of sensors like LDR Sensors, Infrared (IR) Sensor, Motion Sensors, TSOP, Temperature Sensors, Ultrasonic, etc.PCB Board All type of Boards for Arduino, Copper Cladding, Vero Board, Bread Broad, etc.Of course it really depends on what your application is going to be. PIC or DSPIC DSPic is a much more advance controller chip than a regular PIC.The BJTs are again classified into NPN and PNP transistors. Transistors are basically classified into two types they are Bipolar Junction Transistors (BJT) and Field Effect Transistors (FET).
TRANSISTOR & MOSFET All types of Transistor and Mosfet are available on Nex Electronic at Best Price.Connectors & Plugs All type of Header: Male Header, Female Header, Dc Connectors, AC connectors, Fuse, USB, Power Connector, IC Connectors, etc.
#BC557 TRANSISTOR DRIVER#
It can amplify power, voltage and current at different configurations. BC557 Transistor as AmplifierĪ Transistors acts as an Amplifier when operating in Active Region. Where, the value of V BE should be 5V for BC557 and the Base current (I B depends on the Collector current (I C). The value of this resistor (R B) can be calculated using below formulae.
#BC557 TRANSISTOR SERIES#
Anything more than 5mA will kill the Transistor hence a resistor is always added in series with base pin. As mentioned the biasing current should maximum of 5mA. As discussed a transistor will act as an Open switch during Forward Bias and as a Closed switch during Reverse Bias, this biasing can be achieved by supplying the required amount of current to the base pin. When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 660 mV. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V CE) or Base-Emitter (V BE) could be 200 and 900 mV respectively. When this transistor is fully biased then it can allow a maximum of 100mA 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 100mA, hence we cannot connect loads that consume more than 100mA using this transistor. This is where a PNP transistor differs from a NPN transistor, a Logic state (blue colour) is used to toggle between Ground and Signal Voltage (Emitter-Base Voltage V BE) as shown belowīC557 has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. BC157, BC558, 2N3906, 2SA1943, BD140, S8550, TIP127, TIP42 Brief Description on BC557 TransistorīC557 is a PNP transistor hence the collector and emitter will be closed (Forward biased) when the base pin is held at ground and will be opened (Reverse biased) when a signal is provided to base pin.
0 kommentar(er)
