Complex mathematical models of op-amp circuits are broken down into simple, logical steps.
How to use these chips to add, subtract, or filter signals.
You can download the PDF version of "Linear Integrated Circuits and Applications" by U A Bakshi from various online sources, including:
The IC 555 timer is covered extensively, explaining its internal block diagram (comparators, flip-flop, and discharge transistor). The book details its operation in:
Pair your reading with open-source SPICE simulation tools (like LTspice). Recreate the filters and timers described by Bakshi to see how component tolerances affect performance. To help tailor further recommendations, let me know:
Inverting and non-inverting amplifiers, voltage followers, summing amplifiers, instrumentation amplifiers, differentiators, and integrators.