My background is math/finance.

Hi Jim, my background is EE/finance. I think you are going to be pleasantly surprised that your university studies have prepared you very well, to learn circuit design. The foundations, upon which all of circuit design rests, are: algebra, algebra, algebra, calculus, differential equations, algebra, algebra, complex variables, Laplace transforms (a sub-topic of differential equations), and algebra.

Fortunately, you have already learned these. You might need to refresh your memory in a couple of areas, but it's not brand new unexplored territory.

You'll learn a few domain-specific facts and axioms, such as: Kirchoff's Voltage Law (KVL), Ohm's Law, Kirchoff's Current Law (KCL). These let you reduce a circuit to a set of simultaneous linear equations. Which you already know how to solve! All you do is: use algebra.

When you get into small signal analysis, for example when studying the frequency response of an amplifier, you'll discover that this is nothing more than KVL and KCL using complex variables. Because circuit analysis exclusively uses linear elements, all circuit responses are linear differential equations with constant coefficients. That ought to sound very familiar. To find diffEq solutions quickly and easily, EEs use Laplace Transforms. The transformed equations are polynomials in "s" (the complex frequency), with constant coefficients. You already know Laplace Transforms.

You've got a tremendous advantage over the typical sophomore studying EE. You already know all the math! All you need to do is learn the "idioms" of circuit design. I'd suggest you read "Getting Started in Electronics" by Forrest Mims, and "Practical Electronics for Inventors" by Paul Scherz. Learn KVL, KCL, and Ohm's Law. Learn how to solve DC circuits. Learn how to solve AC circuits. Learn how to use LTSPICE. Read Bob Cordell's book on audio amp design. Put his circuits into LTSPICE and simulate them; see how they work. After a while you'll be ready to buy a used copy of Gray and Meyer, and after finishing that book you'll be an analog design Guru.

Good luck and very best wishes!

MarkJ