Experiment 2 - The NPN-Transistor II
How can you "open" the transistor?
In order to achieve this
you have to extend the circuit from the last experiment.
Consider the circuit shown,
to which a resistor and a pushbutton switch was added.
On connecting the battery, the LED remains dark.
When you press the pushbutton switch, the LED ligths up brightly.
The transistor "switches through".
Circuit with transistor.
Circuit diagram with transistor.
What has changed...?