DIY analogue synth project Tutorial Part 10c (simple building a variable volatge reference) HD

Hello guys here is a video demonstration of how I built a refrence voltage for the 12bit DAC used for the Arduino midi to cv gate converter circuit. There are other circuits and more accurate ones out there. I tried this as it was simple and very small inexpensive parts count. Mistake at around 5.20 the 100k resistor was taken to the non invertin input pin 3 not the inverting input. I do all my videos with no rehersal so I apologize for any misleading info.