Transistor Led Schaltung. Usually the signal from a microcontroller or logic gate does not possess sufficient drive current to power an led directly. Closing this switch turns on the transistor which causes current to flow through the led.
The transistor used in this experiment was picked randomly from a box of salvaged components it was a bc238b npn type low power general purpose transistor. You might be wondering why you d need or want to bother with a transistor in this circuit. As discussed earlier that the transistor can be used as a switch.
The circuit described in this video shows how an npn transistor can be used to switch on an led.
The first inverter output is connected to the input of the second inverter. Usually the signal from a microcontroller or logic gate does not possess sufficient drive current to power an led directly. Transistor to switch the led. When the inverter input is 12v the transistor in the first inverter will turn on and the led will come on and the inverter output voltage will be 0 2v.
