I want to make a Schmitt trigger using a JFET instead of a bipolar transistor. I started by trying to understand how this circuit worked using a BJT and then moved on to try and replace them with JFETs. See circuit and output desired using BJT below.
I looked up how to replace a BJT with a JFET but I couldn't find anything useful. I tried using capacitors in series with R3 (see below) and I got a square signal, but it is centered on the peak of my input triangle signal which means the two threshold values are the same.