Calculate the current you need to pass through the transistor when its on that is your collector current. Here the example numbers shown are for the bjt bc548.
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The following calculators will compute all of the bias values of the transistor circuit given the supply voltage and the base voltage and all of the resistor values.
Transistor switch base resistor calculator. The data sheet gives a minimum value of 06v which is very typical and a maximum value of 15v at 15ma base current. Home tools transistor switch saturation calculator transistor switch saturation calculator. To calculate a suitable value of the base resistor rb we start by calculating the saturation current at the collector i csatthen using a gain of 10 we use the gain formula to find the required saturating base current i bsatfinally armed with the saturating base current and the input switching voltage at the base we use ohms law to calculate the base resistance value.
Its important that you read the following. Transistor base resistor calculator 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 beta and vd transistor parameters can be measured or gathered from a data sheet.
Here is a calculator for transistor base resistor values. These values are responsible for enabling transistor saturation. Bjt transistor as a switch saturation calculator.
Calculating the base resistor is a common engineering task which this calculator automates. The v be sat is the base to emitter voltage when the transistor is in saturation. If the collector current is 40ma then base current should be 4ma.
The current gain beta hfe is a value you can find in the datasheet for the specific transistor. V be base emitter voltage v rb base resistor base resistance k. A bjt transistor can be used as an electronic switch when it is driven into saturation or alternatively driven to the cut off region.
Assuming that base is powered by signal of voltage v45v then base resistor will be rv vbeib45 070004950 ohm. When transistor is used as a switch it is common to assume that base current is 110 of the collector current. Base resistence needed to drive transistor into saturation.
If the pi is supplying 33v when the pin is driven high then the voltage across the input resistor is 33v 06v 27v. Bjt transistor as a switch saturation calculator. Base resistence needed to drive transistor into saturation.
First you must check the datasheet of the transistor in question and identify the values vbe vce and hfe. Transistor base resistor calculator. Rc collector resistance.
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