Transistor Led Schaltung. The schematic below shows how a transistor is used to switch the light emitting diode 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.
As discussed earlier that the transistor can be used as a switch. 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. Usually the signal from a microcontroller or logic gate does not possess sufficient drive current to power an led directly.
The transistor amplifies this base current and the led spotlight bulb ends up receiving a current of 58ma at 11 13 volts 645 mw.
This led chaser circuit using transistors produce a blinking effect that is look same as running effect. 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. The 0 2v at the input of the second inverter is small enough that the second transistor is turned off. These are available in bulk from as little as 2p each.
