This is the Baker Clamp -it keeps the inverting transistor (Q9 in this case) from being saturated and/or over-driven. Great circuit.Studied that little diode trick. Here the base to collector voltage never reaches close to more than 0.3V when transistor turns off.
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That is an interesting little trick for improved performance.
Yes, unfortunately i have not yet found a solution for thisYour resistor values are a little low, giving an average power supply current of about 80mA.
To ensure that the current mirrors are completely offNot sure the purpose of R11 and R12. The circuit works just fine without them at slightly higher frequency. I did have to adjust R6 from 10 to 8 after removing them, but you can regain the symmetry without them.
I've seen that in commercial function generator schematics; it does a nice job of eliminating or reducing non-linearity at the transition points. I almost used it once, but the company didn't get the project.This design reminded me the use of two constant current sources on the same cap; one of them feeding current 2I permanently and the other switched on/off periodically draining current I. Linear slopes both.
IIRC, it was the ICL8038 whereI've seen that in commercial function generator schematics; it does a nice job of eliminating or reducing non-linearity at the transition points. I almost used it once, but the company didn't get the project.
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Granted. I thought the circuit was extremely interesting. I enjoyed reverse engineering it and learned a few things going through it. I am not sure how the TS came up with that design but it was extremely creative. Hat's off to the TS.Certainly an interesting design for learning about discrete transistor circuits, but I see no advantage for that over a simpler and lower power circuit using high speed op amps.
I have done quite a few of these triangle wave designs over the course of many years, whenever i get bored enough. Many were posted on here for comments and suggestion. The baker clamp diodes were suggested by the more knowledgeable, nice folks on here. The concept were solely based on one of my non conventional square wave generator, from there on, i constantly try to find a way to improve it. This is so far, my favoret versionI am not sure how the TS came up with that design
by Duane Benson
by Duane Benson
by Duane Benson
by Duane Benson