I haven't posted here for ages, i had to re-join as my e-mail address and computer have changed.
I need to come up with an active filter to pass a 1200 Hz signal. I have no idea how to select the capacitor and resistors for this frequency.
I would really appreciate if someone could give me some direction.
Thanks in advance
Instrumentation Consultant (retired)
Just buy a tunable one like MFJ-752D Signal Enhancer II, at least for audio signals, not Ac power lines.
Sorry, I should have provided some more information the MFJ-752D would be way overkill. I am trying to detect a 1200 Hz signal from a light beam.
The signal I am trying to detect is a light beam modulated at 1200 Hz. Unfortunately, the detector is also subjected to natural sunlight which has the effect of swamping the signal. It needs to be a simple one or two stage filter entering on 1200.
I was thinking of an active filter based on a thru hole Op amp.
a simple split-tee filter will impress you, as it surprised me in a lab class I supervised.
For example http://sim.okawa-denshi.jp/en/TwinTCRkeisan.htm
I am new member of this forum.
Would suggest you to read and take some notes from the document and the link herebelow:
Active Filter Design Techniques
Its a well documented file for designing a filter.
Hope it can be an help ...