Hello there, I'm so rusty at this stuff I squeak. Quick into, I graduated from a CET about 20 years ago. Back then, I could build circuits in my sleep. Since then, I've moved onto industrial instrumentation, and my circuit level electronics knowledge is long gone. The project I need help with is a smoker temperature controller for my Primo XL. The simplest and most well known option is a small fan (around 10 cfm) to provide the intake draft, with feedback and control provided by a PID temperature controller. Generally, the 12 Vdc fan is run in the on/off mode, but this presents a few issues. I would prefer a linear control, but that has problems as well. Is it possible to design an amplifier that will take the output of a PID (1-5, or 2.4-12 vdc), and allow me to set the amplifier output to the fan at an adjustable lower voltage (because it probably won't start at 2.4 volts) up to the maximum 12 vdc?