Working through the Art of Electronics chapter on #Oscillators. I'd like to try out each of the designs on paper, in #simulation, and on the bench. As the first installment I chose the phase-delay oscillator (#PDO).

Oscillation occurs when a system meets certain 'criteria.' It's beautiful to observe the moment when these criteria are met. Here's an #audio frequency
implementation of a PDO from Wes Hayward, built with Dwight Aplevich's #circuit_macros.

m4 source: https://codeberg.org/rjp/diy-tm/src/commit/16fe0654c70797a3195af976e57d39b12fcb00e4/pdo/osc.m4