#Bc548 pinout driver
Driver Modules like Relay Driver, LED driver etc.
When uses as an Amplifier the DC current gain of the Transistor can be calculated by using the below formulaeĭC Current Gain = Collector Current (IC) / Base Current (IB) In the below GIF you can notice the transistor being switched for a low voltage (1v) audio signal Where an input signal of low voltage is amplified (switched) to high voltages t0 drive loads like speakers. The BC558 because of this large gain value is normally used to as a audio amplifier. Of the above types, common emitter type (which amplifies voltage) is the popular and mostly used configuration. Some of the configurations used in amplifier circuits are. It can amplify power, voltage and current at different configurations. Where, the value of VBE should be 5V for BC558 and the Base current (IB) depends on the Collector current (IC).Īlso note that a PNP transistor is always used for high side switching, meaning the collector is connected to power and emitter to load that is to be switched.Ī Transistors acts as an Amplifier when operating in Active Region. The value of this resistor (RB) can be calculated using below formulae.
#Bc548 pinout series
A resistor is always added in series with base pin to limit the base current. 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 (VCE) or Base-Emitter (VBE) could be 200 and 900 mV respectively. When this transistor is fully biased then it can allow continues current of 100mA to flow across the collector and emitter. The peak current that could flow through the Collector pin is 200mA, this combined with the high gain value makes it an ideal choice for audio amplification applications. This is where a PNP transistor differs from a NPN transistor.īC558 has a gain value of 110 to 800 this value determines the amplification capacity of the transistor. Note: Complete technical details can be found in the BC558 datasheet given at the end of this page.īC157, BC556, 2N3906, 2SA1943, BD140, S8550, TIP127, TIP42īC558 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)
