Finally got a triangle to saw converter working

I have a couple of triangle core VCOs based on the 2164. I've had this idea for a triangle to saw converter in the back of my mind and finally sat down to simulate it in falstad.

It uses a slope detector to extract a square wave that's in phase with the triangle. Most triangle VCOs have the square wave from the Schmitt trigger but I thought I'd try this instead of modifying what I've alread built.

The triangle is separately offset and halved in amplitude. This offset triangle is sent to a switchable inverter (based off of an attenuverter) that inverts the triangle at the turning point to give you a saw.

It's actually less sensitive to the triangle offset and amplitude than I thought it would be. I might actually put controls in there because you get some waveshaping effects like frequency doubling the saw.

[Here's the circuit simulation.](http://tinyurl.com/2x3gjfvs)

Next is to breadboard it and see if there are any surprises with real parts. It will likely be joined by a PWM circuit since I don't have that with any of my VCOs.