This question isn't exactly electronics math related ...

All devices expect a voltage swing between two points, a high and low voltage. Transistors are the basis of everything, and they come in PNP or NPN, depending on whether they will want their voltage supply pin to be above or below the voltage of circuit ground in typical usage. (I am being purposefully vague about the pin labels here, because you could, conceivably, use the pins in different ways.) The middle pin is typically going to need to be somewhere between the highest and lowest DC voltage for the transistor.

Op amps are just a bunch of NPN and PNP transistors. They require a positive, negative, and in-between voltage. For best performance, you want that to be exactly halfway.

Understand that +V/-V is NORMAL for most circuits involving op amps, and guitar pedals only use an artificial bias voltage point of 4.5V because we use a power supply that only gives +9V relative to a common ground. Many electronics have a transformer and take AC voltage, rectify it to +- voltages, and ground is Vb. That's all Vb is: It's a fake ground. The op amp doesn't care what the voltage is.

I think you can get away with just knowing how to do the following with guitar pedals -- because this is all I ever used and I think I did just fine:

- Voltage dividers. EVERYTHING IS A VOLTAGE DIVIDER. EVERYTHING. Whether they're frequency-specific deals with ...

- RC filters: You can use a calculator or do them by hand. Figuring out exactly when you're looking at one, and how to find the capacitance if it's hidden, is experience, not math. These cover almost everything. Even LFOs are just an application of an RC filter.

- Resistor ratios, simple applications of Ohm's laws, and simple applications of the power law: You can use a calculator, like this site, which actually tells you what's behind the equations: http://www.sengpielaudio.com/calculator-amplification.htm. Knowing when you're looking at a voltage divider and what the resistances are is often experience, not math.

Most of the typical math in EM beyond the basics is covered in part of a university physics progression (often there's an entire class dedicated to EM), calculus textbooks (download Strang's free calculus textbook and just do the electrical engineering problems), differential equations, and linear algebra (Anton's Elementary Linear Algebra applications version, which you can find "extreeeeeeeemely" "cheap" if you look hard enoupdf has an entire chapter dedicated to analyzing current flow via linear systems). This might be a lot of work that you may decide could more profitably be used to build. If you already know some calculus, though, you might have an easier time of it, and you don't need a full linear algebra course with the abstract math to understand matrix math, so you can skip all the parts of Linear Algebra that I personally enjoyed and just do the irritating part

.

This course will have "some" math in it:

https://www.edx.org/course/circuits-electronics-1-basic-circuit-mitx-6-002-1x-0Also stuff, so check the MIT site to find out if the material is the same.

*Maybe budget more time than they tell you.*https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-002-circuits-and-electronics-spring-2007/The actual course has diff eq and physics as a requirement ... so ....... Good luck.