H hery New Member Oct 15, 2012 #1 hi every one, i wanna make PWM signals by comparing the triangular negative signal and negative sine wave signal as its inputs. i use LM311 as comparator. i have simulated in proteus, but its doesn't work well. here i attach the circuit
hi every one, i wanna make PWM signals by comparing the triangular negative signal and negative sine wave signal as its inputs. i use LM311 as comparator. i have simulated in proteus, but its doesn't work well. here i attach the circuit
ericgibbs Well-Known Member Most Helpful Member Oct 16, 2012 #2 hi, On your Sim you show that pin7, Col out is used as the signal out. You should have pin1 Emitter out connected to -Vcc, 0V on your circuit. Last edited: Oct 16, 2012
hi, On your Sim you show that pin7, Col out is used as the signal out. You should have pin1 Emitter out connected to -Vcc, 0V on your circuit.
H hery New Member Oct 18, 2012 #3 thank you eric, i have try, but the signal inputs are reduced, maybe it should use double supply so that the LM311 can compare negative signal inputs,,
thank you eric, i have try, but the signal inputs are reduced, maybe it should use double supply so that the LM311 can compare negative signal inputs,,
alec_t Well-Known Member Most Helpful Member Oct 18, 2012 #4 Try these LM311 connections:- pin1 to 0V (Gnd) and pin 4 to the -12V rail.