Hi, I am trying to make a Monostable circuit with my 12V LED strip. When I push the switch once, the LED strip will light up for 10 seconds and go off by itself. I have built the circuit using this schematic, the only difference is I am using a 1000uf capacitor. Everything works, but the only problem I have is the 555 timer can only output 200mA, so the LED strip is very dim. I understand that I could use a TIP31C NPN transitor to amplify the current? What I did was wire the base to pin 3, the collector to the negative pin of my LED strip and the emitter to pin 1(ground). THe LED doesn't light up at all. I am not really an expert in electronics, I hope someone can help me. Thank you.