Adafruit Trinket 5v https://learn.adafruit.com/introducing-trinket/pinouts
I'm really sorry to bother you all with my ignorance but I completely suck at math and couldn't figure out the equation for Ohm's law. I'm at a crossroads and don't know where to turn. This Adafruit Trinket will only produce 20 milliamps from GPIO pins. I need to add a transistor to one of the pins I've programmed to push 20mA to 7.5v.
All the GPIO pins can be used as digital inputs, digital outputs, for LEDs, buttons and switches etc. They can provide up to 20mA of current. Don't connect a motor or other high-power component directly to the pins! Instead, use a transistor to power the DC motor on/off
I'm not trying power a motor. I'm trying to power a self-made cup warmer made from kanthol wire and polymer clay. Can anybody advise what transistor will boost 20 milliamps to 7.5v? Your assistance will be greatly appreciated.