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What happens when a 0V signal is given?
As you can see, whenever a 0V signal is given, 12V is seen in the output, and whenever a 5V is given in the input, 0V is seen on the output. Let’s see how it works. First of all, let’s start with the scenario where the input is 5V, or in other words, HIGH.
What happens when a switch is closed on a transistor?
When the switch is closed, base current starts flowing through the transistor and then drives into saturation, which results in LED to turn ON. Resistors are placed to limit the currents through the base and LED. It is also possible to vary the intensity of LED by varying the resistance in the base current path. Transistor to Operate the Relay
How is the cutoff region used in a switching circuit?
Cutoff Region is primarily used in switching and digital logic circuits. In this mode of operation, both the emitter-base and collector-base junctions are forward biased. Current flows freely from collector to emitter with almost zero resistance.
Can a p channel MOSFET be switched on + 5V?
To switch the high side of the load you either need to raise the Gate voltage above +5V, or invert the circuit and use a P Channel MOSFET as you did in your last example. The PMOSFET works on negative voltage, so you need to apply 0V on the Gate to turn it on, and +5V to turn it off.
Where does the 5V come from on an Arduino?
The 5V pin on the arduino is coming from the voltage regulator. The only way to turn it off would be to unplug the board. If you are just trying to supply 5V to some component that you can turn on and off, then you can use one of the digital pins as long as the current requirements are low. Set the pin HIGH to supply 5V and LOW to turn it off.
What happens when the base of Q1 is held at 5V?
Q1 switches the high side switch, thereby isolating the micro from the 12V on the base of Q2. When the base of Q1 is held at 5V, the emitter will be 4.3V, so there will be 1mA thru R1.