Hi, I have a Nano connected to four 74hc595 shift registers. They work beautifully when it comes to outputing the right voltages for testing with LEDs. My issue is that the current they output is not nearly what I need. They output approximately .01 to .02 amps, when I need much higher, maybe in the range of .2A to 1A. Whats the smallest/lightest way of amplifying the current of an output based on the voltage given by the shift registers? I've heard suggestions of transistors, and relays from various sources but without any solid pointers to a particular model. I am willing to add another power source as well.
If I am not giving enough information, please let me know.