Simple VCF

This is a very simple VCF with a CV input. It is from Hendrik Göttling's schematic “Ultra Simple VCF.“ I don't remember where I found the schematic on the web, but I suspect it came from the electro-music forums. Message me if you have trouble finding it. This VCF (Voltage Controlled Filter) is made from a tl071 op amp chip, 6 resistors, 3 capacitors, 2 pots and a diode. The schematic is very simple, and takes about an hour to build (less if you're good at this type of stuff). In this video I am gener