As you all probably know, I am not an electronics engineer or had any training. I just try and understand why the things I do work or don't work.
In an effort to take a signal and convert it into on and off states, I used a darlington array. I found that I could take a 12V signal feed into one channel on a darlington and turn on an led. I also wanted to activate a relay and have another led that was illuminated when the 12V signal was off. By applying a 1k resistor to the output of one channel and feeding that output to the input of another channel, the output of the other channel was inverted. It works brilliantly for switching a number of circuits from just one input.
My question is why does it work. I have attached a quick schematic. if 12V is applied to Pin 1 then LED 1 is illuminated and LED 2 not. When 0V is applied to Pin 1, then LED 2 is illuminated and LED 1 not.
I am just interested to know why is works.
In an effort to take a signal and convert it into on and off states, I used a darlington array. I found that I could take a 12V signal feed into one channel on a darlington and turn on an led. I also wanted to activate a relay and have another led that was illuminated when the 12V signal was off. By applying a 1k resistor to the output of one channel and feeding that output to the input of another channel, the output of the other channel was inverted. It works brilliantly for switching a number of circuits from just one input.
My question is why does it work. I have attached a quick schematic. if 12V is applied to Pin 1 then LED 1 is illuminated and LED 2 not. When 0V is applied to Pin 1, then LED 2 is illuminated and LED 1 not.
I am just interested to know why is works.