with prisha.
261013:
inverter using an op-amp:
261015:
from Design of op amp sine wave oscillators, By Ron Mancini:
Oscillation results from an unstable state; i.e., the feed- back system can’t find a stable state because its transfer function can’t be satisfied. Equation 1 becomes unstable when (1+Aβ) = 0 because A/0 is an undefined state. Thus, the key to designing an oscillator is to insure that Aβ = –1 (called the Barkhausen criterion), or using complex math the equivalent expression is Aβ = 1∠–180°.
another explainer: https://www.youtube.com/watch?v=gbUXbaxvX94
wein bridge oscillator frequency calculation:
made three oscillators:
