@natecull My saving grace when it comes to analog circuitry is operational amplifiers: https://en.wikipedia.org/wiki/Operational_amplifier_applications
As for transistors, I can follow if it's just a BJT with a current limiting resistor on the base and a pulldown resistor on the collector, but you lose completely me when there's a resistor on the emitter, or if someone drops a FET in there. I could never get FETs to do anything useful in a circuit.