hello, OK, I've been breaking my head over this one for a while and
just can't figure it out. It's an example from a book called
"Practical Electronics For Inventors" It's basically a "Simple
Triangle-wave/Square-wave Generator" It has a integrator opamp
circuit feeding the non-inverting input on a positive feedback....
(schmitt trigger or comparator not about the terminology here) opamp
circuit, and then that feeds the inverting input back on the
integrator...

The book then shows this equation for the threshold voltage (Vt): Vt Vsat / (R3 - R2) , but i can't for the life of me see how they got this..... the circuit is as follows, anyone have any idea of how Vt is found? The rails are at +/- 15V for each opamp

Thanks Joshua

(view in courier font)

--------------------------------------- | | | | | C R3 | | |---| |--|

The book then shows this equation for the threshold voltage (Vt): Vt Vsat / (R3 - R2) , but i can't for the life of me see how they got this..... the circuit is as follows, anyone have any idea of how Vt is found? The rails are at +/- 15V for each opamp

Thanks Joshua

(view in courier font)

--------------------------------------- | | | | | C R3 | | |---| |--|

___/\/\___| | | | | | | | R1 | |\ | R2 | |\ | | ----/\/\---|-\____|__/\/\_|_|+\_ |____| ___|+/ ___|-/ | |/ | |/ | | --- --- /// ///