I'm trying to design an ultrasonic range finder using only analog components. So far I've designed the Wien Bridge and one amplifier. The problem is that I'm trying to create a band-pass filter in the amp loop. While my calculations show that the filter's band is between 35.367-41.882kHz which is fine (I think ) since the incoming wave is ~38kHz, the bode plotter shows a different band:1-1MHz. Maybe one of my connections is wrong? Or the plotter is wrong? I'll be happy to hear any input you might have on the matter or how to improve the circuits.
Thank you for running the simulations.
It looks much better when R12 isn't connected, but still the band width is way too high. I thought that R9 and C5 are the high pass filter and R11 and C4 are the low pass filter. This is strange....
On the simulation with R12 disconnected shouldnt C3 be removed too (from your circuit diagram)?
Thank you for running the simulations.
It looks much better when R12 isn't connected, but still the band width is way too high. I thought that R9 and C5 are the high pass filter and R11 and C4 are the low pass filter. This is strange....
On the simulation with R12 disconnected shouldnt C3 be removed too (from your circuit diagram)?