Design a circuit that will turn on a small incandescent lamp when darkness falls.
It should use a light-dependent resistor (LDR), a potentiometer to set the trigger level, and one or more darlington transistors, and other components as required.
Component values are not required.
(Correct answer attached).
I want to know, in the attached diagram, was an extra transistor used to invert the '0' at the collector (output) of the darlington? As I would have rather have switched places of the LDR and potentiometer, so that when it is dark the darlington goes on, and I wouldnt have to draw an extra transistor.
Why is a resistance needed above the darlington (as it isnt the load)?
It should use a light-dependent resistor (LDR), a potentiometer to set the trigger level, and one or more darlington transistors, and other components as required.
Component values are not required.
(Correct answer attached).
I want to know, in the attached diagram, was an extra transistor used to invert the '0' at the collector (output) of the darlington? As I would have rather have switched places of the LDR and potentiometer, so that when it is dark the darlington goes on, and I wouldnt have to draw an extra transistor.
Why is a resistance needed above the darlington (as it isnt the load)?