Calculate Base Resistor For 2n3904

The current gain beta hfe is a value you can find in the datasheet for the specific trans. Home transistor base resistor calculator.

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Calculate base resistor for 2n3904. How do you calculate the value for the resistor between the transistor base and the bs2 pin. Consider a base resistor that controls the amount of current entering the base junction of a bipolar junction transistor bjt to cause it to conduct in the saturation region. The load will be connected between the collector and 12v and the emitter will be connected to gnd.

Remember as mike green said the 2n3904 is a to92 style transistor and you must put a resistor on the collector side to keep the current under 200ma or have a load equal to the resistor or it will get extremely hot and magic smoke will emerge. That means the voltage drop on the base resistor is about 5 vbe 43v 36v for a darlington. This resistor determines the amount of saturation current i bsat flowing into the base junction and that controls the amount of saturation current i csat flowing through the collector and emitter junctions.

Since we want to saturate the transistor we are calculating the minimum base current or the maximum resistor value. Transistor base resistor calculator. First you must check the datasheet of the transistor in question and identify the values vbe vce and hfe.

That is the current through the base resistor should be 130th or more of the current through the led. I typically use 330ohm or 390ohm. 43v 10ma 430ohm.

Here is a calculator for transistor base resistor values. I know that since it is not an inductive load i will not need a diode. H fe current gain is listed at 30 minimum so use that to calculate your base resistor r1.

Here the example numbers shown are for the bjt bc548. Transistors expect you to know what current you need to correctly define the case. These values are responsible for enabling transistor saturation.

Calculate the current you need to pass through the transistor when its on that is your collector current. Between your pins output close to 5v but you can check the datasheet the base resistor and the vbe of the transistor you need to drop about 5v.

Procedure 1 Measure And Record The Values Of The

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