Hello,
I've been studying active filters using op amps in school for the past week so I decided to take a look at discrete active filters using a transistor but I'm not sure if I understand how the circuit works.
So here is what I think, when frequency goes up reactance of the C1 goes down and depending what the input impedance of the transistor say double the reactance of C1, acts as a High Pass Filter.
When frequency goes down C1 reactance goes up, so if input impedance of transistor is lower less signal goes through.
Am I missing something with the 5K feedback resistor or something else?
Thanks
I've been studying active filters using op amps in school for the past week so I decided to take a look at discrete active filters using a transistor but I'm not sure if I understand how the circuit works.
So here is what I think, when frequency goes up reactance of the C1 goes down and depending what the input impedance of the transistor say double the reactance of C1, acts as a High Pass Filter.
When frequency goes down C1 reactance goes up, so if input impedance of transistor is lower less signal goes through.
Am I missing something with the 5K feedback resistor or something else?
Thanks
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