$2 Square Wave PWM Function Generator (4K)

[@tsbrownie]

Videos on the oscilloscope used in this video:
The DSO138: th-cam.com/video/I5jvzTOeHKc/w-d-xo.html
Using the DSO138: th-cam.com/video/TMfAsKkLerU/w-d-xo.html
A brief comparison of the $3, $2, $1 function generators that I have made detailed videos of.
$1 Function Generator Kit: th-cam.com/video/gU6ts5ku-Zg/w-d-xo.html
$2 Square Wave PWM Function Generator: th-cam.com/video/5rMtucqDbf0/w-d-xo.html
$3 Function Generator Kit: th-cam.com/video/TMfAsKkLerU/w-d-xo.html
$3, $2, $1 Function Generators - Quick Compare: th-cam.com/video/5bPkQULDgfY/w-d-xo.html