i'm new in this domain, but I like a lot. So, I have a question: I have a circuit with 20 LED (series + parallel 50mV, 3V), and I want to stay HIGH all time, except when I get a signal from another circuit. I want to do this without use a microprocessor, but I didn`t know how. I try with MOSFET N-Channel, P-Channel, but didn't get solution for my problem.
Thank you and sorry for my bad English. I work also on this ;)