This circuit will be used in a car with 12VDC (up to 15VDC) power. 32 LED's in total, powered in groups of 4 LED's (30ma each - 120ma per circuit), 8 circuits in total. See my graphic example attached.
Normal state of LED's is off
When 12V signal is applied to the circuit all LED's will turn on.
When the 12V signal is removed each circuit will turn off with a delay between each circuit. A chasing sequence of circuits turning off.
I install computer systems involving motion control and plc. Designing circuits is a bit outside my current skill set but I will enjoy putting this together and making it work. I find several circuits that could lend themselves to a sequence of LED ON but not the other way around. I also find several methods for transistor switching to handle the power requirement of each circuit. I have also seen PIC and other simple controllers that could handle this application. I am not knowledgeable enough to select the best components and circuit while keeping it simple. Please point me to an existing circuit on this site or perhaps another. I am eager to learn more as this project is built and put to use.
Normal state of LED's is off
When 12V signal is applied to the circuit all LED's will turn on.
When the 12V signal is removed each circuit will turn off with a delay between each circuit. A chasing sequence of circuits turning off.
I install computer systems involving motion control and plc. Designing circuits is a bit outside my current skill set but I will enjoy putting this together and making it work. I find several circuits that could lend themselves to a sequence of LED ON but not the other way around. I also find several methods for transistor switching to handle the power requirement of each circuit. I have also seen PIC and other simple controllers that could handle this application. I am not knowledgeable enough to select the best components and circuit while keeping it simple. Please point me to an existing circuit on this site or perhaps another. I am eager to learn more as this project is built and put to use.
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