Support the channel:   / moritzklein  
Buy as a DIY kit: https://www.ericasynths.lv/shop/diy-k...
Working simulation on falstad: https://tinyurl.com/yhlpjufd

In this video, I'm updating my VCO design to include voltage controlled PWM as an additional feature. Also, there's a rather annoying bug to fix.

If you want to follow along, here's the BOM:

2x 100k resistor
2x 68k resistor
1x 14k resistor
1x 1k resistor
1x 250k linear mono potentiometer
1x TL074 quad op amp

Chapters:
00:00 Intro & sound demo
01:02 The trouble with pulse waves & AC coupling
07:30 Comparators as saw-to-square converters
11:10 Controlling the pulse width with external CV
13:00 Output impedances
14:33 Another sound demo & outro