How to make tunable bandpass filter in Urdu
High order tunable bandpass filter ke design me jo mushkillain pesh aati hain in me RC network ke variable resister ki dorost training bhi shamil hai. Is mushkil ka aik hal ye hai ke switch ke zariye capacitor network me se kisi aik capacitor ko intekhab kia jae. zail me diye gaye circuit se ye technique waza hai.
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