#79: Op Amp Power Supply Considerations: split, single, virtual ground, etc. - a tutorial

#77: Op Amp Peak Detector Tutorial, with peak detector basics

#75: Basics of Opamp circuits - a tutorial on how to understand most opamp circuits

#140: Basics of an Op Amp Summing Amplifier

#172: Basics of Op Amp Gain Bandwidth Product and Slew Rate Limit

#380: Circuit Fun: Twin-Tee Oscillator - low distortion op amp sine waves

#381: Circuit Fun Followup: Trimming out distortion on Twin-Tee Oscillator - FFT &THD measurement