WARNING : loud and abrasive sounds can cause hearing loss and cognitive vexation. Please turn down your volume.
OSCILLATOR
An educational foray into the basic structure of hardware oscillators using Schmitt triggers (digital) and operational amplifiers (analog).
Schematic Source:
Nicolas Collins Handmade Electronic Music: The Art of Hardware Hacking
pp. 111 - 129
Chip: Schmitt Trigger
Schematic source: My own attempt
Chip: Op-Amp
Schematic source:
Instructibles - Square Wave Oscillator
Chip: Op-Amp