I have designed a bandpass filter. Here is the circuit and spectral characteristic:
As you can see from the response curve, it has cutoff with the peak ranging from 260 kHz to 290 kHz.
Here is the actual circuit :
However, the filter works more like a High pass, passing frequencies all above 250 kHz, without any distortion or attenuation.
Here is one of the outputs :
(I observe outputs at all frequencies above 250 kHz. This is just one example)
Where am I going wrong, and what corrections do I need to make?
I decided to simulate my circuit , and it was clear why my circuit acted as Highpass. (The last freq is graph in 1 MHz). Dunno why the filter design tool showed that (incorrect) graph then.