Ultra-low distortion oscillator, part 2: the real deal; A simple circuit with an optocoupler creates a “tube” sound; How to control your impulses—part 2; References. Paul, C, The Simple Sineman, ...

2. The waveforms at four critical points include the output of U1 (the square wave) and the junction of R1 and C1 (the “triangular” wave) (a); the waveforms at R1/C1 and R2/C2 (b); the ...

Even on the total harmonic distortion meter, the oscillator performs, with a THD of only 0.125%. This video is part of [Alan]’s “Circuit Fun” series, which we’ve really been enjoying.