However, the engineering community widely views preservation and personal use of out-of-print, commercially unavailable technical works as or abandonware (though not legally recognized). Many educators argue that blocking access to foundational texts hampers innovation.
Handbook of Operational Amplifier Circuit Design : Free Download, Borrow, and Streaming : Internet Archive. Internet Archive Handbook of Operational Amplifier Applications (Rev. B)
The handbook includes numerous mathematical equations and formulas to support op-amp circuit design. Some examples include:
The "interesting features" of this classic 1976 text lie in its highly practical, cookbook-style
Many university libraries maintain physical or authorized digital copies of classic McGraw-Hill engineering handbooks.