Analog feedback - oscilloscope & Lite2Sound BC

Oct 7, 2018 builds p26-lite2sound-bc

Contributed by Kevin Reid on Oct 7, 2018

Light from the oscilloscope screen hits a photodiode, producing an electrical signal which is amplified and fed into the oscilloscope input. Modulation results from the the beam moving off the screen, passing under the black graticule (grid), or being obstructed by objects in front of the screen.