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It depends on the maximum/minimum output voltage and the output voltage at the time. -Vout*R1/(R1+R2) is the threshold I think. So, if Vout = -5V and R2=9*R1 the positive threshold will be 0.5V. Apologies if I have got this wrong - I haven't a pen & paper handy and I am on my mobile phone.
what a schmitt trigger? you have a noninverting amplifier with programmable gain factor depending on R2/R1 ratio. if you want use it in nonlinear region the TF threshold voltages completely depend on the opamp upper/lower saturation voltages.
what a schmitt trigger? you have a noninverting amplifier with programmable gain factor depending on R2/R1 ratio. if you want use it in nonlinear region the TF threshold voltages completely depend on the opamp upper/lower saturation voltages.
A Schmitt trigger is NOT an amplifier with a gain determined by R2/R1. Rather, it is an opamp with POSITIVE feedback that considerably enlarges the speed of output voltage state change (which can assume only two stable states: pos. and neg. extreme values, determined by the suplly rail.)
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