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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. Control Led Using Gpio Output Pin Raspberry Pi Spy Driving Relays With Cmos And Ttl Outputs Calculator How To Read Transistors Sciencing 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 ...