![]() ![]() Them being not tidy isn't a function of the simulator. If they do their breadboards in the same manner, they are back asking "why doesn't it work. We both know, from reading this type of forum, that some people do not wire their schematics "cleanly". You will need to use a at least a 2-pole filter for each the HP and LP sections, for a total of 4 poles. How did I do that?Īlso, if you look at the Bode Plot, you are not getting the filter rolloff sufficient to be at 0.707*7V at 45kHz and at 55kHz. Note that I am driving the input with 1v and getting 7V out. You still must change the design to get more reasonable values for R1,2,3 and 6. I took your circuit, changed one resistor, and here is the Bode Plot showing a gain of 7 in the pass band. Set up the HP and LP sections so each has a small gain such that Glp*Ghp = 7. There is no need to have a third opamp to get the gain. Try to constrain them to be between ~10K and 1MegOhm. The values used in the input and feed back at the opamps are way off. You are driving your proposed circuit with 60Hz, instead of sweeping the frequency from ~1KHz to about 1MegHz.Īs Jim said, you are overdriving the input.Ī 741 amplifier does not even come close to having sufficient gain-bandwidth product to do this job. You need to figure out how to get that toy simulator you are using to do a Bode plot (frequency response). ![]()
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