Instructions

26
13 Adjustable brightness
The potentiometer (pot for short) is a three-terminal adjusta-
ble resistor. Such components are also used as volume con-
trols in radios. But in this case, it is used to set the brightness
of a green LED.
The further you turn the knob to the right, the brighter the
LED will shine. So far, different resistances between 0.47kΩ
and 10k Ω have been used. The pot can be set between 0k
Ω and 10k Ω. But, because a series resistor of 0 Ω is not
allowed and could overload the LED, a resistor with 0.47k Ω
is connected in series. The total resistance is then adjustable
between 0.47k Ω and 10.47k Ω.