I am fairly new to building custom circuits and need some ideas on how to make this system work. I am familiar with relays, transistors, diodes, resistors, and such. I am also able to solder and have some project circuit boards. I have a 2.5volt source that comes on and off at 2-3 second intervals for 5-6times when triggered, I need it to send just one ground pulse that can handle 1.5 amps at 12volt for just a few seconds.(like triggering door locks in a car) Im hoping to be able to build this with inexpensive parts that I can get easily. The exact use is im using the feed wire off a cell phones vibration motor to activate the accessory wire from remote car starters. When you text the phone it sends 2.5v 2 times and when you call it sends 2.5v 5-7 times. I need a circuit that on the first 2.5volt will send a ground pulse to the specified wire and also cut the input feed for 60 seconds or so to ignore other pulses. Any ideas would help out greatly.