Transistor Bc548 As A Switch

The example external circuit contains a dc motor. Bc548 as switch when a transistor is used as a switch it is operated in the saturation and cut off region as explained above.

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Resistor r1 is a current limiting resistor which protects the transistor bc548 from over current.

Transistor bc548 as a switch. A transistor switch which is used for opening or closing of a circuit that means the transistor is commonly used as a switch in the electronic devices only for the low voltage applications because of its low power consumptiontransistor work as a switch when it is in cutoff and saturation regions. The transistor behaves as a switch to ground because when the transistor is conducting it provides a ground path to the load rl. When a transistor is used as a switch it is operated in the saturation and cut off region as explained above.

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. Here is a simple circuit that uses a bipolar junction transistor bjt to drive a small 5 v relay coil. Companies like nxp philips micro electronics and fairchild to name a few are the leaders in manufacturing this device.

It gets power from the vcc via normally closed nc terminal of relay. Keep a single 1k resistor in the base and take that via a switch to the positive rail dave. 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.

Bc548 has a gain value of 110 to 800 this value determines the amplification capacity of the transistor. To make the bc547 a pure onoff switch then get rig of the second transistor and trimpot and other assoc components. Formula to find base resistance to calculate the value of the base resistor first find some parameters from the reference information of the transistor that you are using.

A bc547 is a general purpose small signal transistor fit for almost all types of circuit applications and therefore extensively used for making an unlimited range of electronic gadgets today. A cheap general purpose transistor such as the bc548 is capable of controlling a small relay with a holding current of less than 300 ma. Bc548 is a npn transistor so 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.

Usually an npn transistor in a common emitter configuration used as a switch drives the relay. Transistor bc548 resistor 1kw relay 6v working. In this video i am going to show you how to use any npn transistor as dc relay or switch by using cheap npn transistor and 1k or 10k resistor depending on input voltage.

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