Click the Edit Spice Model… button to open the Spice Model Editor and then open the Model tab. This involves operating the transistor in saturation mode, i.e., V E V C for NPN and V E > V B Edit Properties… from the contextual menu. Schematic Diagram Of Transistor Switch Circuit For instance, the maximum current ratings of the GPIO pins for the Arduino Uno is 20 mA and the Raspberry Pi is 16 mA. Sometimes a BJT transistor is used as a switch to drive higher loads (current) than is typically capable from a microcontroller’s GPIO output pins.
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